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Physical characterization of a scanning photon counting digital mammography system based on Si‐strip detectors
Author(s) -
Åslund Magnus,
Cederström Björn,
Lundqvist Mats,
Danielsson Mats
Publication year - 2007
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2731032
Subject(s) - detective quantum efficiency , optics , optical transfer function , photon counting , detector , x ray detector , digital mammography , physics , image sensor , mammography , photon , digital radiography , image quality , noise (video) , materials science , radiography , computer science , medicine , cancer , artificial intelligence , breast cancer , nuclear physics , image (mathematics)
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 μ m and the field of view 24 × 26cm 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 μ 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 anode‐filter combination with an added 2 mm Al filtration.