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Proceedings Paper

Imaging performance of an amorphous selenium flat-panel detector for digital fluoroscopy
Author(s): Dylan C. Hunt; Olivier Tousignant; Yves Demers; Luc Laperriere; John A. Rowlands
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Paper Abstract

The imaging performance of a 34.5 x 34.5 cm2 direct conversion flat-panel detector with a 1 mm thick amorphous selenium layer was measured over the fluoroscopic exposure range (0.56 - 10.8 μR/frame). The pixels measured 300 x 300 μm. Measurements of the modulation transfer function (MTF), the noise power spectrum (NPS), and the detective quantum efficiency (DQE) were made. By comparing the MTF to the sinc function the measured effective fill factor of the active matrix was determined to be almost 100%. The electronic noise of the active matrix was measured and found to be 3800 electrons. The DQE(f) was found to be better than the expected sinc2 function. This was due to the presence of a pre-sampling blur identified as charge trapping at an interface in the a-Se layers. At the highest exposure investigated, the DQE(0) was found to be less than the quantum efficiency and the difference was ascribed to a combination of the electronic noise, a small drop in sensitivity due to the charge trapping blur, and incomplete charge collection.

Paper Details

Date Published: 5 June 2003
PDF: 9 pages
Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); doi: 10.1117/12.480131
Show Author Affiliations
Dylan C. Hunt, Sunnybrook and Women's College Health Sciences Ctr. (Canada)
Olivier Tousignant, Anrad Corp. (Canada)
Yves Demers, Anrad Corp. (Canada)
Luc Laperriere, Anrad Corp. (Canada)
John A. Rowlands, Sunnybrook and Women's College Health Sciences Ctr. (Canada)


Published in SPIE Proceedings Vol. 5030:
Medical Imaging 2003: Physics of Medical Imaging
Martin J. Yaffe; Larry E. Antonuk, Editor(s)

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