Physical characterization of a scanning photon counting digital mammography system based on Si-strip detectors
2007 (English)In: Medical physics (Lancaster), ISSN 0094-2405, Vol. 34, no 6, 1918-1925 p.Article in journal (Refereed) Published
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.
mammography; detective quantum efficiency; scanning; MODULATION TRANSFER-FUNCTION; IMAGE QUALITY CHARACTERIZATION; QUANTUM EFFICIENCY; PERFORMANCE; ENERGY
Medical Laboratory and Measurements Technologies
IdentifiersURN: urn:nbn:se:kth:diva-6941DOI: 10.1118/1.2731032ISI: 000247479600008ScopusID: 2-s2.0-34447303835OAI: oai:DiVA.org:kth-6941DiVA: diva2:11796
QC 20100825. Uppdaterad från Accepted till Published 20100825.2007-03-302007-03-302010-08-25Bibliographically approved