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  • 51.
    Goldvasser, Dov
    et al.
    Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston MA, United States .
    Hansen, Viktor J.
    Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston MA, United States .
    Noz, Marilyn E.
    New York University, Department of Radiology.
    Maguire Jr., Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Zeleznik, Michael P.
    University of Utah, Salt Lake City, UT, USA.
    Olivecrona, Henrik
    Karolinska Institute.
    Bragdon, Charles R.
    Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston MA, United States .
    Weidenhielm, Lars
    Karolinska Institute.
    Malchau, Henrik
    Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston MA, United States .
    In vivo and ex vivo measurement of polyethylene wear in total hip arthroplasty2014Inngår i: Acta Orthopaedica, ISSN 1745-3674, E-ISSN 1745-3682, Vol. 85, nr 3, s. 271-275Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background - Determination of the amount of wear in a polyethylene liner following total hip arthroplasty (THA) is important for both the clinical care of individual patients and the development of new types of liners. Patients and methods - We measured in vivo wear of the polyethylene liner using computed tomography (CT) (obtained in the course of regular clinical care) and compared it to coordinate-measuring machine (CMM) readings. Also, changes in liner thickness of the same retrieved polyethylene liner were measured using a micrometer, and were compared to CT and CMM measurements. The distance between the centers of the acetabular cup and femoral head component was measured in 3D CT, using a semi-automatic analysis method. CMM readings were performed on each acetabular liner and data were analyzed using 3D computer-aided design software. Micrometer readings compared the thickest and thinnest regions of the liner. We analyzed 10 THA CTs and retrievals that met minimal requirements for CT slice thickness and explanted cup condition. Results - For the 10 cups, the mean difference between the CT readings and the CMM readings was -0.09 (-0.38 to 0.20) mm. This difference was not statistically significant (p = 0.6). Between CT and micrometer, the mean difference was 0.11 (-0.33 to 0.55) mm. This difference was not statistically significant (p = 0.6). Interpretation - Our results show that CT imaging is ready to be used as a tool in clinical wear measurement of polyethylene liners used in THA.

  • 52.
    Goldvasser, Dov
    et al.
    Massachusetts General Hospital, Boston MA, USA.
    Noz, Marilyn E.
    New York University, Department of Radiology.
    Maguire, Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Olivecrona, Henrik
    Karolinska Institutet, Sweden.
    Bragdon, Charles R.
    Massachusetts General Hospital, Boston MA, USA.
    Malchau, Henrik
    Massachusetts General Hospital, Boston MA, USA.
    A New Technique for Measuring Wear in Total Hip Arthroplasty Using Computed Tomography2012Inngår i: The Journal of Arthroplasty, ISSN 0883-5403, E-ISSN 1532-8406, Vol. 27, nr 9, s. 1636-1640Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Accurately estimating polyethylene wear in 3 dimensions, without the need for additional procedures or equipment, is of significant interest. We investigated the use of a high-resolution clinical computed tomographic (CT) scanner to estimate femoral head displacement relative to the cup as an indirect method of estimating polyethylene wear. A hip phantom was used to simulate the 3-dimensional displacement of a femoral head. The phantom was imaged in a high-resolution CT scanner. The mean difference between the true phantom displacement as positioned by micrometers and the calculated displacement based on the CT images was as follows: for the x-axis, 0 mm (SD, 0.213; SE, 0.058); y-axis, 0.039 mm (SD, 0.035; SE, 0.026); and z-axis, 0.039 mm (SD, 0.051; SE, 0.020).

  • 53. Gorniak, R. J. T.
    et al.
    Kramer, E. L.
    New York University.
    Maguire Jr., Gerald Q.
    KTH, Tidigare Institutioner, Mikroelektronik och informationsteknik, IMIT.
    Noz, Marilyn E.
    New York University.
    Schettino, C. J.
    Zeleznik, Michael P.
    Evaluation of a semiautomatic 3D fusion technique applied to molecular imaging and MRI brain/frame volume data sets2003Inngår i: Journal of medical systems, ISSN 0148-5598, E-ISSN 1573-689X, Vol. 27, nr 2, s. 141-156Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A generally applicable {3D} fusion method was evaluated using molecular imaging and {MRI} volumetric data sets from 15 brain tumor patients with stereotactic frames attached to their skull. Point pairs, placed on the frame only, were chosen, polynomial warping coefficients were generated to map voxels from one coordinate space to the other. The {MRI} frame was considered the reference structure and the standard for "correct" registration. An {ANOVA} test (p {\textgreater} 0.05) confirmed the point pair choice to be consistent. The 95\% confidence interval for the t-test showed the measured distance difference between the registered volumes was within one {MRI} voxel. A further experiment was conducted to independently evaluate the brain registration based on testing for consistency of randomly selected interior/exterior points. A t-test result (p {\textless} 0.05) showed that the consistency (i.e., both interior or both exterior) before and after volume registration were significantly different. This fusion method may be a viable alternative when other methods fail.

  • 54.
    Gorniak, Richard J.
    et al.
    New York University.
    Farrell, Edward J.
    IBM Thomas J. Watson Research Center.
    Kramer, Elissa L.
    New York University, Department of Radiology.
    Maguire Jr., Gerald Q.
    Columbia University, Department of Computer Science.
    Noz, Marilyn E.
    New York University, Department of Radiology.
    Reddy, David P.
    Accuracy of an Interactive Registration Technique Applied to Thallium-201 SPECT and MR Brain Images1997Inngår i: Medical physics (Lancaster), ISSN 0094-2405, Vol. 24, nr 8, s. 1354-Artikkel i tidsskrift (Fagfellevurdert)
  • 55.
    Gorniak, Richard J.
    et al.
    New York University.
    Kramer, Elissa L.
    New York University, Department of Radiology.
    Maguire Jr., Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Noz, Marilyn E.
    New York University, Department of Radiology.
    Schettino, C. J.
    New York University, Department of Radiology.
    Zeleznik, Michael P.
    Saya Systems Inc., Salt Lake City, UT, USA.
    Evaluation of a Semi-Automatic 3D Fusion Technique Applied to Thallium-201 SPECT and MRI Brain/Frame Volume Data Sets2001Inngår i: Medical physics (Lancaster), ISSN 0094-2405, Vol. 28, nr 8, s. 1190-Artikkel i tidsskrift (Fagfellevurdert)
  • 56.
    Griss, Martin L.
    et al.
    University of Utah, Department of Computer Science.
    Benson, Eric
    University of Utah, Department of Computer Science.
    Kessler, Robert R.
    University of Utah, Department of Computer Science.
    Lowder, Steve
    University of Utah, Department of Computer Science.
    Maguire Jr., Gerald Q.
    University of Utah, Department of Computer Science.
    Peterson, John W.
    University of Utah, Department of Computer Science.
    PSL Implementation Guide1982Rapport (Annet vitenskapelig)
  • 57.
    Griss, Martin L.
    et al.
    University of Utah.
    Benson, Eric
    University of Utah.
    Maguire Jr., Gerald Q.
    University of Utah.
    PSL: A Portable LISP System1982Inngår i: Proceedings of the 1982 ACM symposium on LISP and functional programming - LFP ’82, 1982, s. 88-97Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    This paper presents the implementation strategy and current status of a new Portable LISP System, PSL, based upon STANDARD LISP. PSL is written entirely in itself and is compiled with an efficient LISP compiler with machine-oriented optirnizations. A full PSL is currently running on a DECSystem-20 and a VAX, and a preliminary version runs on a Motorola MC68000. Versions for a CRAY-1 and an IBM-370 are planned.

  • 58.
    Griss, Martin L.
    et al.
    University of Utah, Department of Computer Science.
    Hearn, Anthony C.
    University of Utah, Department of Computer Science.
    Maguire Jr., Gerald Q.
    University of Utah, Department of Computer Science.
    Using The MODE Analyzing version of REDUCE1980Rapport (Annet vitenskapelig)
  • 59.
    Griss, Martin L.
    et al.
    University of Utah, Department of Computer Science.
    Kessler, Robert R.
    University of Utah, Department of Computer Science.
    Maguire Jr., Gerald Q.
    University of Utah, Department of Computer Science.
    TLISP - A Transportable LISP Implemented in Pcode1979Rapport (Annet vitenskapelig)
  • 60.
    Griss, Martin L.
    et al.
    University of Utah.
    Kessler, Robert R.
    University of Utah.
    Maguire Jr., Gerald Q.
    University of Utah, Department of Computer Science.
    TLISP - A "Transportable-LISP" Implemented in P-code1979Inngår i: Symbolic and algebraic computation: EUROSAM 79, an International symposium on symbolic and algebraic manipulation, Marseille, France, June 1979 / [ed] E. W. Ng, London, U.K.: Springer-Verlag , 1979, s. 490-502Konferansepaper (Fagfellevurdert)
  • 61.
    Hager, Rolf
    et al.
    Aachen Univ of Technology, Aachen, Germany.
    Klemets, Anders
    KTH, Tidigare Institutioner, Teleinformatik.
    Maguire Jr., Gerald Q.
    Computer Science at Columbia University, New York NY, USA.
    Smith, Mark T.
    Hewlett Packard Laboratories, Palo Alto.
    Reichert, Frank
    KTH, Tidigare Institutioner, Teleinformatik.
    MINT: A mobile Internet router1993Inngår i: Proceedings of the IEEE Vehicular Technology Conference '93, IEEE Press, 1993, s. 318-321Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The mobility of portable computers and workstations is not transparent to users. They adjust to reduced services as long as they have no connection to a supporting infrastructure. The goal of the Walkstation project is to realize a user transparent mobile IP router (MINT) for wireless links (infrared and radio) operating at 1-10 Mbit/sec. For the study of user behavior and system characteristics, a campuswide testbed (ERIC) with 50-100 stations is planned to demonstrate the new solutions found in the Walkstation II project.

  • 62. Haider, J. M.
    et al.
    Kramer, Elissa L.
    New York University, Department of Radiology.
    Maguire Jr., Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Millan, Evelyn
    New York University.
    Noz, Marilyn E.
    New York University, Department of Radiology.
    Orbach, D. B.
    Zeleznik, Michael P.
    Saya Systems Inc., Salt Lake City, UT, USA.
    Problems with two automatic methods for SPECT-SPECT and SPECT-MRI Volume Matching2002Inngår i: Medical physics (Lancaster), ISSN 0094-2405, Vol. 29, nr 8, s. 1944-Artikkel i tidsskrift (Fagfellevurdert)
  • 63.
    Hans, Mat
    et al.
    HP.
    Hoover, Christopher
    HP.
    Maguire Jr., Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Smith, Mark T.
    HP.
    Badge 4 Embedded Development Kit: Bastille Day Release2002Rapport (Annet vitenskapelig)
  • 64.
    Hatherly, Robert
    et al.
    Department of Nuclear Medicine, Karolinska University Hospital, Stockholm, Sweden .
    Brolin, Fredrik
    Department of Nuclear Medicine, Karolinska University Hospital, Stockholm, Sweden .
    Oldner, Asa
    Department of Nuclear Medicine, Karolinska University Hospital, Stockholm, Sweden .
    Sundin, Anders
    Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden .
    Lundblad, Henrik
    Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden .
    Maguire Jr., Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Jonsson, Cathrine
    Department of Medical Physics, Karolinska University Hospital, Stockholm, Sweden.
    Jacobsson, Hans
    Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden .
    Noz, Marilyn E.
    New York University, Department of Radiology.
    Technical Requirements for Na18F PET Bone Imaging of Patients Being Treated Using a Taylor Spatial Frame.2014Inngår i: Journal of nuclear medicine technology, ISSN 1535-5675Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Diagnosis of new bone growth in patients with compound tibia fractures or deformities treated using a Taylor spatial frame is difficult with conventional radiography because the frame obstructs the images and creates artifacts. The use of Na(18)F PET studies may help to eliminate this difficulty.

    METHODS: Patients were positioned on the pallet of a clinical PET/CT scanner and made as comfortable as possible with their legs immobilized. One bed position covering the site of the fracture, including the Taylor spatial frame, was chosen for the study. A topogram was performed, as well as diagnostic and attenuation correction CT. The patients were given 2 MBq of Na(18)F per kilogram of body weight. A 45-min list-mode acquisition was performed starting at the time of injection, followed by a 5-min static acquisition 60 min after injection. The patients were examined 6 wk after the Taylor spatial frame had been applied and again at 3 mo to assess new bone growth.

    RESULTS: A list-mode reconstruction sequence of 1 × 1,800 and 1 × 2,700 s, as well as the 5-min static scan, allowed visualization of regional bone turnover.

    CONCLUSION: With Na(18)F PET/CT, it was possible to confirm regional bone turnover as a means of visualizing bone remodeling without the interference of artifacts from the Taylor spatial frame. Furthermore, dynamic list-mode acquisition allowed different sequences to be performed, enabling, for example, visualization of tracer transport from blood to the fracture site.

  • 65.
    Horii, Steven C.
    et al.
    New York University.
    Maguire Jr., Gerald Q.
    Noz, Marilyn E.
    New York University.
    Desirable Characteristics of a Frame Buffer for Multimodality Image Display1988Konferansepaper (Fagfellevurdert)
  • 66.
    Horii, Steven C.
    et al.
    New York University.
    Maguire Jr., Gerald Q.
    Noz, Marilyn E.
    New York University.
    Schimpf, James H.
    New York University.
    Unified Digital Image Display and Processing System1981Inngår i: Proceedings of the Society of Photo-Optical Instrumentation Engineers, ISSN 0361-0748, Vol. 314, s. 340-346Artikkel i tidsskrift (Fagfellevurdert)
  • 67.
    Horii, Steven C.
    et al.
    New York University.
    Noz, Marilyn E.
    New York University.
    Maguire Jr., Gerald Q.
    Schimpf, James H.
    New York University.
    Zeleznik, Michael P.
    Hitchner, Lewis E.
    University of Utah.
    Baxter, Brent S.
    University of Utah.
    A Unified Digital Image Distribution and Processing System1983Inngår i: Medical physics (Lancaster), ISSN 0094-2405, Vol. 10, nr 1, s. 129-129Artikkel i tidsskrift (Fagfellevurdert)
  • 68.
    Horii, Steven C.
    et al.
    New York University.
    Noz, Marilyn E.
    New York University, Department of Radiology.
    Maguire Jr., Gerald Q.
    Columbia University, Computer Science.
    Schimpf, James H.
    New York University.
    Zeleznik, Michael P.
    New York University.
    Hitchner, Lewis E.
    University of Utah.
    Baxter, Brent S.
    University of Utah.
    A Unified Digital Image Distribution and Processing System1982Inngår i: Medical physics (Lancaster), ISSN 0094-2405, Vol. 10, nr 1, s. 129-Artikkel i tidsskrift (Fagfellevurdert)
  • 69.
    Horii, Steven C.
    et al.
    New York University.
    Noz, Marilyn E.
    New York University.
    Schimpf, James H.
    New York University.
    Maguire Jr., Gerald Q.
    Unification of Images from Diverse Modalities: Toward Imaging as a Science1982Inngår i: Proceedings of MEDCOMP ’82, IEEE Computer Society, 1982, s. 142-147Konferansepaper (Fagfellevurdert)
  • 70.
    Horii, Steven C.
    et al.
    New York University.
    Noz, Marilyn E.
    New York University.
    Schimpf, James H.
    New York University.
    Maguire Jr., Gerald Q.
    Unification of Images from Diverse Modalities: Toward Imaging as a Science1982Inngår i: Proceedings of Annual Symposium on Computer Application in Medical Care (SCAMC ’82), IEEE , 1982, s. 335-337Konferansepaper (Fagfellevurdert)
  • 71.
    Horii, Steven C.
    et al.
    New York University.
    Schimpf, James H.
    New York University.
    Maguire Jr., Gerald Q.
    Zeleznik, Michael P.
    Noz, Marilyn E.
    New York University.
    Broad-band Co-axial Cable Image Viewing and Processing for Radiology1983Inngår i: Proceedings of the Society of Photo-Optical Instrumentation Engineers, ISSN 0361-0748, Vol. 418, s. 247-257Artikkel i tidsskrift (Fagfellevurdert)
  • 72.
    Horii, Steven C.
    et al.
    New York University.
    Zeleznik, Michael P.
    Maguire Jr., Gerald Q.
    Schimpf, James H.
    New York University.
    Hitchner, Lewis E.
    University of Utah.
    Noz, Marilyn E.
    New York University.
    Baxter, Brent S.
    University of Utah.
    A Simple Feasibility Demonstration of a Local Area Network for a Digital Imaging Department1982Inngår i: Proceedings of the Society of Photo-Optical Instrumentation Engineers, ISSN 0361-0748, Vol. 375, s. 600-604Artikkel i tidsskrift (Fagfellevurdert)
  • 73.
    Ioannidis, John
    et al.
    Columbia University.
    Duchamp, Dan
    Columbia University.
    Maguire Jr., Gerald Q.
    Columbia University.
    IP-based protocols for mobile internetworking1991Inngår i: Computer communication review, ISSN 0146-4833, E-ISSN 1943-5819, Vol. 21, nr 4, s. 235-245Artikkel i tidsskrift (Fagfellevurdert)
  • 74.
    Ioannidis, John
    et al.
    Columbia University.
    Duchamp, Daniel J.
    Columbia University.
    Maguire Jr., Gerald Q.
    Columbia University.
    IP-based protocols for mobile internetworking1991Inngår i: SIGCOMM '91 Proceedings of the conference on Communications architecture & protocols, Association for Computing Machinery (ACM), 1991, s. 235-245Konferansepaper (Fagfellevurdert)
  • 75.
    Ioannidis, John
    et al.
    Columbia University, Department of Computer Science.
    Duchamp, Daniel J.
    Columbia University, Department of Computer Science.
    Maguire Jr., Gerald Q.
    Columbia University, Department of Computer Science.
    IP-based Protocols for Mobile Internetworking1991Rapport (Annet vitenskapelig)
    Abstract [en]

    We consider the problem of providing network access to hosts whose physical location changes with time. Such hosts cannot depend on traditional forms of network connectivity and routing because their location, and hence the route to reach them, cannot be deduced from their IP address. We present protocols that seamlessly integrate mobile hosts into the current IP networking infrastructure. They are primarily targeted at supporting a campus environment with mobile computers, but also extend gracefully to accomodate hosts moving between different networks. The key feature is the dependence on ancillary machines to track the location of the mobile hosts. Our protocols are designed to react quickly to changing topologies, to scale well, and not to place an overwhelming burden on the network.

  • 76.
    Ioannidis, John
    et al.
    Columbia University.
    Maguire Jr., Gerald Q.
    Columbia University, Department of Computer Science.
    Coherent File Distribution Protocol1991Inngår i: Internet Request for Comments, ISSN 2070-1721, Vol. RFC 1235 (Experimental)Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This memo describes the Coherent File Distribution Protocol (CFDP). This is an Experimental Protocol for the Internet community. It does not specify an Internet standard.

  • 77.
    Ioannidis, John
    et al.
    Columbia University, Department of Computer Science.
    Maguire Jr., Gerald Q.
    Columbia University, Department of Computer Science.
    PIP-1: A Personal Information Portal with wireless access to an information infrastructure1990Rapport (Annet vitenskapelig)
    Abstract [en]

    We discuss our ideas for the Personal Information Portal its hardware and software platform our visions for its use and its impact on the student and the professional community.

    Fulltekst (pdf)
    fulltext
  • 78.
    Ioannidis, John
    et al.
    Columbia University, Department of Computer Science.
    Maguire Jr., Gerald Q.
    Columbia University, Department of Computer Science.
    The Coherent Trivial File Transfer Protocol1990Rapport (Annet vitenskapelig)
    Abstract [en]

    CFDP is a protocol that takes advantage of the broadcast nature of CSMA networks to speed up simultaneous one-to-many file transfers (e.g., when booting diskless workstations). The CFDP server listens and services requests for entire files or portions thereof. CFDP clients first determine whether the file they are interested in is already being transferred, in which case they "eavesdrop" and load as much of it as they can or they initiate a new transfer. The clients timeout when the server stops transmitting and if they are still missing parts of the file they request them with a block-transfer request. CFDP is a back-end protocol a front end is needed to handle naming and security issues. A simple such front end is also presented here.

    Fulltekst (pdf)
    fulltext
  • 79.
    Ioannidis, John
    et al.
    Columbia University.
    Maguire Jr., Gerald Q.
    KTH, Tidigare Institutioner, Teleinformatik.
    The Design and Implementation of a Mobile Internetworking Architecture1999Inngår i: Mobility Processes, Computers, and Agents / [ed] Dejan S. Milojicic, Fredrick Douglis, and Richard G. Wheller, Addison-Wesley Professional , 1999, 1, s. 365-377Kapittel i bok, del av antologi (Fagfellevurdert)
  • 80.
    Ioannidis, John
    et al.
    Columbia University.
    Maguire Jr., Gerald Q.
    Columbia University, Department of Computer Science.
    The Design and Implementation of a Mobile Internetworking Architecture1993Inngår i: Usenix Winter 1993 Technical Conference, USENIX Assocaition , 1993, s. 491-502Konferansepaper (Fagfellevurdert)
  • 81.
    Ioannidis, John
    et al.
    Columbia University.
    Maguire Jr., Gerald Q.
    Columbia University, Department of Computer Science.
    Ben-Shaul, Israel
    Columbia University.
    Levedopoulos, Marios
    Columbia University.
    Liu, Micky
    Columbia University.
    Porting AIX onto the student electronic notebook1991Inngår i: Proceedings of the 1991 ACM SIGSMALL/PC symposium on Small systems, Association for Computing Machinery , 1991, s. 76-82Konferansepaper (Fagfellevurdert)
  • 82.
    Ioannidis, John
    et al.
    Columbia University.
    Maguire Jr., Gerald Q.
    Columbia University, Department of Computer Science.
    Ben-Shaul, Israel
    Columbia University.
    Levedopoulos, Marios
    Columbia University.
    Liu, Micky
    Columbia University.
    Porting AIX onto the Student Electronic Notebook1991Inngår i: ACM SIGSMALL/PC Notes, Vol. 17, nr 3-4, s. 5-11Artikkel i tidsskrift (Fagfellevurdert)
  • 83.
    Ioannidis, John
    et al.
    Columbia University, Department of Computer Science.
    Maguire Jr., Gerald Q.
    Columbia University, Department of Computer Science.
    Ben-Shaul, Israel
    Columbia University, Department of Computer Science.
    Levedopoulos, Marios
    Columbia University, Department of Computer Science.
    Liu, Micky
    Columbia University, Department of Computer Science.
    Porting AIX onto the Student Electronic Notebook1990Rapport (Annet vitenskapelig)
    Abstract [en]

    We describe the Student Electronic Notebook and the process of porting IBM’s AIX 1.1 to run on it. We believe that portable workstation-class machines connected by wireless networks and dependent on a computational and informational infrastructure raise a number of important issues in operating systems and distributed computation (e.g., the partitioning of tasks between workstations and infrastructure), and therefore the development of such machines and their software is important.

    We conclude by summarizing our activites, itemizing the lessons we learned and identifying the key criteria for the design of the successor machines.

    Fulltekst (pdf)
    fulltext
  • 84.
    Ismailov, Yuri
    et al.
    KTH, Tidigare Institutioner, Teleinformatik.
    Maguire Jr., Gerald Q.
    KTH, Tidigare Institutioner, Teleinformatik.
    Reichert, Frank
    KTH, Tidigare Institutioner, Teleinformatik.
    Internetworking with Mobitex1996Rapport (Annet vitenskapelig)
  • 85.
    Janek Strååt, Sara
    et al.
    Karolinska Institutet and Stockholm University.
    Andreassen, Björn
    Karolinska Institutet and Stockholm University.
    Johansson, Cathrine
    Karolinska University Hospital Solna, Sweden.
    Noz, Marilyn E.
    New York University, Department of Radiology.
    Maguire Jr., Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Näfstadius, Peder
    Karolinska University Hospital.
    Näslund, Ingemar
    Karolinska Institutet.
    Schoenahl, Frederic
    University Hospital of Geneva, Geneva, Switzerland .
    Brahme, Anders
    Karolinska Institute.
    Clinical application of in vivo treatment delivery verification based on PET/CT imaging of positron activity induced at high energy photon therapy2013Inngår i: Physics in Medicine and Biology, ISSN 0031-9155, E-ISSN 1361-6560, Vol. 58, nr 16, s. 5541-5553Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The purpose of this study was to investigate in vivo verification of radiation treatment with high energy photon beams using PET/CT to image the induced positron activity. The measurements of the positron activation induced in a preoperative rectal cancer patient and a prostate cancer patient following 50 MV photon treatments are presented. A total dose of 5 and 8 Gy, respectively, were delivered to the tumors. Imaging was performed with a 64-slice PET/CT scanner for 30 min, starting 7 min after the end of the treatment. The CT volume from the PET/CT and the treatment planning CT were coregistered by matching anatomical reference points in the patient. The treatment delivery was imaged in vivo based on the distribution of the induced positron emitters produced by photonuclear reactions in tissue mapped on to the associated dose distribution of the treatment plan. The results showed that spatial distribution of induced activity in both patients agreed well with the delivered beam portals of the treatment plans in the entrance subcutaneous fat regions but less so in blood and oxygen rich soft tissues. For the preoperative rectal cancer patient however, a 2 +/- (0.5) cm misalignment was observed in the cranial-caudal direction of the patient between the induced activity distribution and treatment plan, indicating a beam patient setup error. No misalignment of this kind was seen in the prostate cancer patient. However, due to a fast patient setup error in the PET/CT scanner a slight mis-position of the patient in the PET/CT was observed in all three planes, resulting in a deformed activity distribution compared to the treatment plan. The present study indicates that the induced positron emitters by high energy photon beams can be measured quite accurately using PET imaging of subcutaneous fat to allow portal verification of the delivered treatment beams. Measurement of the induced activity in the patient 7 min after receiving 5 Gy involved count rates which were about 20 times lower than that of a patient undergoing standard F-18-FDG treatment. When using a combination of short lived nuclides such as O-15 (half-life: 2 min) and C-11 (half-life: 20 min) with low activity it is not optimal to use clinical reconstruction protocols. Thus, it might be desirable to further optimize reconstruction parameters as well as to address hardware improvements in realizing in vivo treatment verification with PET/CT in the future. A significant improvement with regard to O-15 imaging could also be expected by having the PET/CT unit located close to the radiation treatment room.

  • 86.
    Jansson, Carl-Gustaf
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.
    Jonsson, Martin
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.
    Kanter, Theo G.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth. Ericsson Research, Sweden.
    Kilander, Fredrik
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.
    Maguire Jr., Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.
    Li, Wei
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.
    Context Middleware for Adaptive Services in Heterogeneous Wireless Networks: Concepts, Approach and Work-In-Progress in the ACAS Project2005Inngår i: VTC 2005-Spring: 2005 IEEE 61st Vehicular Technology Conference, Proceedings, IEEE , 2005, Vol. 5, s. 2954-2958Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper provides an overview of important results and work-in-progress within the ACAS project concerning context middleware to enable adaptive, user-centric, mobile services available to users via a heterogeneous wireless infrastructure.

  • 87.
    Jedenmalm, Anneli
    et al.
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi. Lund University, Sweden.
    Nilsson, Fritjof
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi.
    Noz, Marilyn E.
    New York University, Department of Radiology.
    Green, Douglas D.
    Loma Linda University, Orthopaedic Research Center.
    Gedde, Ulf W.
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi.
    Clarke, Ian C.
    Loma Linda University, Orthopaedic Research Center.
    Stark, Andreas
    Karolinska Institute, Department of Molecular Medicine and Surgery.
    Maguire Jr., Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Zeleznik, Michael P.
    Saya Systems Inc., Salt Lake City, UT, USA.
    Olivecrona, Henrik
    Karolinska Institute, Department of Molecular Medicine and Surgery.
    Validation of a 3D CT method for measurement of linear wear of acetabular cups: A hip simulator study2011Inngår i: Acta Orthopaedica, ISSN 1745-3674, E-ISSN 1745-3682, Vol. 82, nr 1, s. 35-41Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Material and methods Ultra-high molecular weight polyethylene cups with a titanium mesh molded on the outside were subjected to wear using a hip simulator. Before and after wear, they were (1) imaged with a CT scanner using a phantom model device, (2) measured using a coordinate measurement machine (CMM), and (3) weighed. CMM was used as the reference method for measurement of femoral head penetration into the cup and for comparison with CT, and gravimetric measurements were used as a reference for both CT and CMM. Femoral head penetration and wear vector angle were studied. The head diameters were also measured with both CMM and CT. The repeatability of the method proposed was evaluated with two repeated measurements using different positions of the phantom in the CT scanner. Results The accuracy of the 3D CT method for evaluation of linear wear was 0.51 mm and the repeatability was 0.39 mm. Repeatability for wear vector angle was 17 degrees A degrees. Interpretation This study of metal-meshed hip-simulated acetabular cups shows that CT has the capacity for reliable measurement of linear wear of acetabular cups at a clinically relevant level of accuracy.

  • 88. Jönsson, Ulf
    et al.
    Alriksson, Fredrik
    Larsson, Tony
    Johansson, Per
    Maguire Jr., Gerald Q.
    KTH, Tidigare Institutioner, Teleinformatik.
    MIPMANET-mobile IP for mobile ad hoc networks2000Inngår i: 2000 First Annual Workshop on Mobile and Ad Hoc Networking and Computing (MobiHOC), Boston, MA, USA, 2000, s. 75-85Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Mobile ad hoc networking allows nodes to form temporary networks and communicate beyond the transmitter range by supporting multihop communication through IP routing. Routing in such networks is often reactive, i.e., performed on-demand, as opposed to Internet routing that is proactive. As ad hoc networks are formed on a temporary basis, any IP address should be allowed to appear in an ad hoc network. This paper presents MIPMANET, a solution for connecting an ad hoc network, in which on-demand routing is used, to the Internet. MIPMANET provides Internet access by using mobile IP with foreign agent care-of addresses and reverse tunneling. This allows nodes to enjoy the mobility services of mobile IP while at the same time the requirements on the ad hoc routing protocol are kept to a minimum. Simulations of MIPMANET have been performed in the Network Simulator 2. The ad hoc on-demand distance vector (AODV) routing protocol has been used for routing within the ad hoc network. These simulations show that the ability to choose the closest access point to the Internet is worth extra work, as less traffic is generated in the network resulting in lower delays and fewer dropped packets.

  • 89.
    Kaminer, Evan
    et al.
    New York University.
    Noz, Marilyn E.
    New York University.
    Sanger, Joseph J.
    New York University.
    Maguire Jr., Gerald Q.
    Columbia University, Department of Computer Science.
    Experience with adding a graphical user interface to an existing image processing toolkit1990Inngår i: S/CAR 90: Computer applications to assist radiology / [ed] Ronald L. Arenson and Richard M. Friedenberg, Carlsbad, CA, USA: Symposium Foundation , 1990, s. 610-617Konferansepaper (Fagfellevurdert)
  • 90.
    Kannan, Anand
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Maguire Jr., Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Sharma, A.
    Schoo, P.
    Genetic algorithm based feature selection algorithm for effective intrusion detection in cloud networks2012Inngår i: Proceedings - 12th IEEE International Conference on Data Mining Workshops, ICDMW 2012, IEEE , 2012, s. 416-423Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Cloud computing is expected to provide on-demand, agile, and elastic services. Cloud networking extends cloud computing by providing virtualized networking functionalities and allows various optimizations, for example to reduce latency while increasing flexibility in the placement, movement, and interconnection of these virtual resources. However, this approach introduces new security challenges. In this paper, we propose a new intrusion detection model in which we combine a newly proposed genetic based feature selection algorithm and an existing Fuzzy Support Vector Machines (SVM) for effective classification as a solution. The feature selection reduces the number of features by removing unimportant features, hence reducing runtime. Moreover, when the Fuzzy SVM classifier is used with the reduced feature set, it improves the detection accuracy. Experimental results of the proposed combination of feature selection and classification model detects anomalies with a low false alarm rate and a high detection rate when tested with the KDD Cup 99 data set.

  • 91.
    Kannan, Anand
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Maguire Jr., Gerald
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Sharma, A.
    Fusenig, V.
    Schoo, P.
    N-ary tree based key distribution in a network as a service provisioning model2012Inngår i: ICACCI '12 Proceedings of the International Conference on Advances in Computing, Communications and Informatics, ACM Digital Library, 2012, s. 952-960Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Cloud networking is a new technology which integrates network provisioning with the existing cloud service provisioning models. This integration allows service providers to provision network resources together with network performance guarantees as a part of their service offering. However, the introduction of multiple providers and service levels introduces many security challenges. One such challenge is identity management, especially authentication of different entities. This paper presents an analysis of a management scheme deployed in a simulated cloud network test bed. Our results show that this scheme is faster than binary and erasure encoding schemes. The scheme uses an N-ary approach and thus allows the placement of n entities at each level, unlike the binary scheme which is restricted to two entities.

  • 92.
    Kanter, Theo G.
    et al.
    Ericsson.
    Lindtorp, Per
    Olrog, Christian
    Maguire Jr., Gerald Q.
    KTH, Tidigare Institutioner, Teleinformatik.
    Smart delivery of multimedia content for wireless applications2000Inngår i: Mobile and Wireless Communications Networks / [ed] C. G. Omidyar, Heidelberger Platz 3, D-14197 Berlin, Germany: Springer-Verlag Berlin , 2000, Vol. 1818, s. 70-81Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Packet-oriented access to cellular networks enables us to deliver multimedia content to mobile users. As cellular networks will continue to deliver circuit switched voice for some time to come, care must be taken to avoid interference between these delivery mechanisms, while maximizing the range of services and the number of users. Smart delivery of multimedia content involving agents running in the mobile, the base station and the content provider allows us to dynamically adapt the application and network behavior to each other in order to meet the criteria for specific applications. In particular, this paper examines the delivery of streaming media and interactive voice as Voice over IP (VoIP) to mobile users. Our conclusion is that this, in combination with the dynamic adaptive properties as introduced by the agents, enables us to transfer voice entirely IP over wireless links, thereby freeing further resources for the new applications that we refer to in this paper.

  • 93.
    Kanter, Theo G.
    et al.
    Ericsson.
    Maguire Jr., Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Escudero, Alberto
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Measurement of minimum handover time in IEEE 802.11b managed mode2001Rapport (Annet vitenskapelig)
    Fulltekst (pdf)
    fulltext
  • 94.
    Kanter, Theo G.
    et al.
    Ericsson.
    Maguire Jr., Gerald Q.
    KTH, Tidigare Institutioner, Teleinformatik.
    Smith, Mark T.
    Hewlett- Packard Research Laboratories, Palo Alto, California, USA.
    Rethinking Wireless Internet with Smart Media2001Inngår i: Proceedings of the Nordic Radio Symposium 2001 (NRS'01), 2001Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Third-generation mobile networks (3G) will support the end-to-end delivery of IP to wireless end-devices. The cost of this infrastructure and the moderate data-rates that can be expected have lead to proposals for a mixed 3G and wireless LAN (WLAN) approach. WLAN delivers much higher data-rates, currently up to 11 Mbps (IEEE 802.11b). Field trials with public WLAN extensions to Gigabit Ethernet networks show outdoor coverage of several hundred meters. Our previous work demonstrated smart delivery of multimedia involving agents running in the mobile, the access point, and the content provider. This allowed us to dynamically adapt both the application and network behavior (to each other) in order to meet the criteria for specific applications. In this paper, we extend this approach by adding service knowledge meta-data to the multimedia content (creating so-called Smart Media) to take advantage of the fact that for non real-time media content, which needs ample bandwidth to deliver, there does not need to be a coupling between transfer rate and playout rate. This approach enables the agent to further free resources for the delivery of streaming media to mobile users. In light of this approach, we propose novel network topologies with WLAN access using Smart Media Packets, for which we examine the minimal requirements for delivering the services.

  • 95.
    Kanter, Theo G.
    et al.
    Ericssson Radio Systems AB.
    Olrog, Christian
    Ericssson Radio Systems AB.
    Maguire Jr., Gerald Q.
    KTH, Tidigare Institutioner, Teleinformatik.
    VoIP over Wireless for Mobile Multimedia Applications1999Inngår i: Personal Computing and Communication (PCC) Workshop, 1999, s. 141-144Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Voice over IP (VoIP) exploits the ability of IP to deliver multiple services over a single access link. Increased computing power and available bandwidth in endpoints, reduced cost and size of electronics, as well as sensor and positioning technologies allow us to develop new interactive multimedia applications that are able to adapt to the communication context of the end-user. This is particularly important as wireless access to the Internet and connectivity between mobile artifacts can leverage these possibilities even further to bring us new ways of communication. Our work shows that, with respect to VoIP over wireless networks, bandwidth is not the problem and that QoS can match that of voice in today’s cellular networks. We therefore propose to run IP directly over wireless links to bring multimedia services to mobile users. Even more importantly, this leads to a significant simplification, and consequently a cost reduction, of the wireless infrastructure.

  • 96.
    Karapantelakis, Athanasios
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Maguire Jr., Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Utilizing Social Context for Providing Personalized Services to Mobile Users2010Inngår i: SMART SENSING AND CONTEXT / [ed] Paul Lukowicz, Kai Kunze, and Gerd Kortuem, Berlin, Heidelberg: Springer-Verlag , 2010, s. 28-41Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We are currently witnessing a growing tendency for users to engage in social activities on the Internet. Consequently, social networks - tools that enable such activities - are increasingly used. This paper describes a system that uses information users share on these networks (personal context), to recommend Web feeds of related content to users. The system mines data from popular social networks and combines it with information from third party websites to create user profiles. Subsequently, these profiles are matched with appropriately tagged Web feeds and are displayed to users through a mobile device application. We evaluate the system with a 6-month test run involving real users. We measure the system's performance as well as user satisfaction and assessment of the accuracy of recommendations by including a feedback mechanism on the mobile application.

  • 97.
    Kastrinos, F.
    et al.
    New York University.
    Maguire Jr., Gerald Q.
    Columbia University, Computer Science.
    Noz, Marilyn E.
    New York University, Department of Radiology.
    Statistical Evaluation of SPECT Scans vs. Structure/Function Image Fusion1990Inngår i: Medical physics (Lancaster), ISSN 0094-2405, Vol. 17, s. 42-Artikkel i tidsskrift (Fagfellevurdert)
  • 98.
    Katsikas, Georgios P.
    et al.
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Datavetenskap, Kommunikationssystem, CoS, Network Systems Laboratory (NS Lab).
    Barbette, T.
    Kostic, Dejan
    Steinert, R.
    Maguire Jr., Gerald Q.
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Datavetenskap, Kommunikationssystem, CoS.
    Metron: NFV service chains at the true speed of the underlying hardware2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper we present Metron, a Network Functions Virtualization (NFV) platform that achieves high resource utilization by jointly exploiting the underlying network and commodity servers’ resources. This synergy allows Metron to: (i) offload part of the packet processing logic to the network, (ii) use smart tagging to setup and exploit the affinity of traffic classes, and (iii) use tag-based hardware dispatching to carry out the remaining packet processing at the speed of the servers’ fastest cache(s), with zero intercore communication. Metron also introduces a novel resource allocation scheme that minimizes the resource allocation overhead for large-scale NFV deployments. With commodity hardware assistance, Metron deeply inspects traffic at 40 Gbps and realizes stateful network functions at the speed of a 100 GbE network card on a single server. Metron has 2.75-6.5x better efficiency than OpenBox, a state of the art NFV system, while ensuring key requirements such as elasticity, fine-grained load balancing, and flexible traffic steering

  • 99.
    Katsikas, Georgios P.
    et al.
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Kommunikationssystem, CoS, Network Systems Laboratory (NS Lab). RISE SICS.
    Barbette, Tom
    University of Liege.
    Kostic, Dejan
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Kommunikationssystem, CoS, Network Systems Laboratory (NS Lab).
    Steinert, Rebecca
    RISE SICS.
    Maguire Jr., Gerald Q.
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Metron: NFV Service Chains at the True Speed of the Underlying Hardware2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper we present Metron, a Network Functions Virtualization (NFV) platform that achieves high resource utilization by jointly exploiting the underlying network and commodity servers’ resources. This synergy allows Metron to: (i) offload part of the packet processing logic to the network, (ii) use smart tagging to setup and exploit the affinity of traffic classes, and (iii) use tag-based hardware dispatching to carry out the remaining packet processing at the speed of the servers’ fastest cache(s), with zero inter-core communication. Metron also introduces a novel resource allocation scheme that minimizes the resource allocation overhead for large-scale NFV deployments. With commodity hardware assistance, Metron deeply inspects traffic at 40 Gbps and realizes stateful network functions at the speed of a 100 GbE network card on a single server. Metron has 2.75-6.5x better efficiency than OpenBox, a state of the art NFV system, while ensuring key requirements such as elasticity, fine-grained load balancing, and flexible traffic steering.

    Fulltekst (pdf)
    fulltext
  • 100.
    Katsikas, Georgios P.
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Network Systems Laboratory (NS Lab).
    Enguehard, Marcel
    Kuźniar, Maciej
    Maguire Jr, Gerald Q.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Kostic, Dejan
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Network Systems Laboratory (NS Lab).
    SNF: synthesizing high performance NFV service chains2016Inngår i: PeerJ Computer Science, ISSN 2376-5992, s. 1-30Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper we introduce SNF, a framework that synthesizes (S) network function (NF) service chains by eliminating redundant I/O and repeated elements, while consolidating stateful cross layer packet operations across the chain. SNF uses graph composition and set theory to determine traffic classes handled by a service chain composed of multiple elements. It then synthesizes each traffic class using a minimal set of new elements that apply single-read-single-write and early-discard operations. Our SNF prototype takes a baseline state of the art network functions virtualization (NFV) framework to the level of performance required for practical NFV service deployments. Software-based SNF realizes long (up to 10 NFs) and stateful service chains that achieve line-rate 40 Gbps throughput (up to 8.5x greater than the baseline NFV framework). Hardware-assisted SNF, using a commodity OpenFlow switch, shows that our approach scales at 40 Gbps for Internet Service Provider-level NFV deployments.

    Fulltekst (pdf)
    fulltext
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