Imaging performance of an amorphous selenium flat-panel detector for digital fluoroscopy

Dylan C. Hunt; Olivier Tousignant; Yves Demers; Luc Laperriere; John A. Rowlands

doi:10.1117/12.480131

5 June 2003 Imaging performance of an amorphous selenium flat-panel detector for digital fluoroscopy

Dylan C. Hunt, Olivier Tousignant, Yves Demers, Luc Laperriere, John A. Rowlands

Proceedings Volume 5030, Medical Imaging 2003: Physics of Medical Imaging; (2003) https://doi.org/10.1117/12.480131
Event: Medical Imaging 2003, 2003, San Diego, California, United States

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.

Citation Download Citation

Dylan C. Hunt, Olivier Tousignant, Yves Demers, Luc Laperriere, and John A. Rowlands "Imaging performance of an amorphous selenium flat-panel detector for digital fluoroscopy", Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); https://doi.org/10.1117/12.480131

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available