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Physical characterization of a scanning photon counting digital mammography system based on Si-strip detectors
KTH, Skolan för teknikvetenskap (SCI), Fysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik.ORCID-id: 0000-0002-3039-9791
2007 (Engelska)Ingår i: Medical physics (Lancaster), ISSN 0094-2405, Vol. 34, nr 6, s. 1918-1925Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2007. Vol. 34, nr 6, s. 1918-1925
Nyckelord [en]
mammography; detective quantum efficiency; scanning; MODULATION TRANSFER-FUNCTION; IMAGE QUALITY CHARACTERIZATION; QUANTUM EFFICIENCY; PERFORMANCE; ENERGY
Nationell ämneskategori
Medicinsk laboratorie- och mätteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-6941DOI: 10.1118/1.2731032ISI: 000247479600008PubMedID: 17654894Scopus ID: 2-s2.0-34447303835OAI: oai:DiVA.org:kth-6941DiVA, id: diva2:11796
Anmärkning
QC 20100825. Uppdaterad från Accepted till Published 20100825.Tillgänglig från: 2007-03-30 Skapad: 2007-03-30 Senast uppdaterad: 2022-06-26Bibliografiskt granskad
Ingår i avhandling
1. Digital Mammography with a Photon Counting Detector in a Scanned Multislit Geometry
Öppna denna publikation i ny flik eller fönster >>Digital Mammography with a Photon Counting Detector in a Scanned Multislit Geometry
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2007. s. viii, 41
Serie
Trita-FYS, ISSN 0280-316X ; 2007:28
Nyckelord
mammography, digital, photon counting, scanning, detective quantum effciency, scattered radiation, automatic exposure control
Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:kth:diva-4322 (URN)978-91-7178-622-7 (ISBN)
Disputation
2007-04-20, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 14:00
Opponent
Handledare
Anmärkning
QC 20100825Tillgänglig från: 2007-03-30 Skapad: 2007-03-30 Senast uppdaterad: 2022-06-26Bibliografiskt granskad

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Åslund, MagnusCederström, BjörnLundqvist, MatsDanielsson, Mats
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