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Physical characterization of a scanning photon counting digital mammography system based on Si-strip detectors
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.ORCID iD: 0000-0002-3039-9791
2007 (English)In: Medical physics (Lancaster), ISSN 0094-2405, Vol. 34, no 6, 1918-1925 p.Article in journal (Refereed) Published
Abstract [en]

The physical performance of a scanning multislit full field digital mammography system was determined using basic image quality parameters. The system employs a direct detection detector comprised of linear silicon strip sensors in an edge-on geometry connected to photon counting electronics. The pixel size is 50 mu m and the field of view 24 x 26 cm(2). The performance was quantified using the presampled modulation transfer function, the normalized noise power spectrum and the detective quantum efficiency (DQE). Compared to conventional DQE methods, the scanning geometry with its intrinsic scatter rejection poses additional requirements on the measurement setup, which are investigated in this work. The DQE of the photon counting system was found to be independent of the dose level to the detector in the 7.6-206 mu Gy range. The peak DQE was 72% and 73% in the scan and slit direction, respectively, measured with a 28 kV W-0.5 mm Al anodefilter combination with an added 2 mm Al filtration.

Place, publisher, year, edition, pages
2007. Vol. 34, no 6, 1918-1925 p.
Keyword [en]
mammography; detective quantum efficiency; scanning; MODULATION TRANSFER-FUNCTION; IMAGE QUALITY CHARACTERIZATION; QUANTUM EFFICIENCY; PERFORMANCE; ENERGY
National Category
Medical Laboratory and Measurements Technologies
Identifiers
URN: urn:nbn:se:kth:diva-6941DOI: 10.1118/1.2731032ISI: 000247479600008Scopus ID: 2-s2.0-34447303835OAI: oai:DiVA.org:kth-6941DiVA: diva2:11796
Note
QC 20100825. Uppdaterad från Accepted till Published 20100825.Available from: 2007-03-30 Created: 2007-03-30 Last updated: 2010-08-25Bibliographically approved
In thesis
1. Digital Mammography with a Photon Counting Detector in a Scanned Multislit Geometry
Open this publication in new window or tab >>Digital Mammography with a Photon Counting Detector in a Scanned Multislit Geometry
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Mammography screening aims to reduce the number of breast cancer deaths by early detection of the disease, which is one of the leading causes of deaths for middle aged women in the western world. The risk from the x-ray radiation in mammography is relatively low but still a factor in the benefit-risk ratio of screening. The characterization and optimization of a digital mammography system is presented in this thesis. The investigated system is shown to be highly dose efficient by employing a photon counting detector in a scanning multislit geometry.

A novel automatic exposure control (AEC) is proposed and validated in clinical practise. The AEC uses the leading detector edge to measure the transmission of the breast. The exposure is modulated by altering the scan velocity during the scan. A W-Al anode-filter combination is proposed.

The characterization of the photon counting detector is performed using the detective quantum efficiency. The effect of the photon counting detector and the multislit geometry on the measurement method is studied in detail. It is shown that the detector has a zero-frequency DQE of over 70\% and that it is quantum limited even at very low exposures.

Efficient rejection of image-degrading secondary radiation is fundamental for a dose efficient system. The efficiency of the scatter rejection techniques currently used are quantified and compared to the multislit geometry.

A system performance metric with its foundation in statistical decision theory is discussed. It is argued that a photon counting multislit system can operate at approximately half the dose compared to several other digital mammography techniques.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. viii, 41 p.
Series
Trita-FYS, ISSN 0280-316X ; 2007:28
Keyword
mammography, digital, photon counting, scanning, detective quantum effciency, scattered radiation, automatic exposure control
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-4322 (URN)978-91-7178-622-7 (ISBN)
Public defence
2007-04-20, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 14:00
Opponent
Supervisors
Note
QC 20100825Available from: 2007-03-30 Created: 2007-03-30 Last updated: 2010-08-25Bibliographically approved

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