Direct selenium x-ray detector for fluoroscopy, R&F, and radiography

Martin Choquette; Henri Rougeot; Jean-Pierre Martin; Luc Laperriere; Ziad Shukri; Brad T. Polischuk

doi:10.1117/12.384485

25 April 2000 Direct selenium x-ray detector for fluoroscopy, R&F, and radiography

Martin Choquette, Henri Rougeot, Jean-Pierre Martin, Luc Laperriere, Ziad Shukri, Brad T. Polischuk

Proceedings Volume 3977, Medical Imaging 2000: Physics of Medical Imaging; (2000) https://doi.org/10.1117/12.384485
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

The use of selenium alloys for direct conversion fluoroscopy flat-panel detectors has been underestimated. The purpose of this paper is to demonstrate the salient features of a selenium-based detector designed for R&F applications. The detector has an active area of 30 cm X 27 cm and comprises 2048 X 1792 pixels at 150 micrometer pitch. The geometric fill factor is 66%, but experimental evidence supports the fact that internal electric field bending leads to an effective fill factor approaching unity. The detector is designed to support full resolution images at 15 frames/second, and 896 X 1024 resolution at 30 frames/second. The detector is coated with a simple coplanar 'p-i-n' selenium diode structure which has a dark current less than 100 pA/cm². The thickness of this structure is 1000 micrometer to absorb 77% of a NEMA standard fluoroscopy beam. Measurements show we have obtained an x-ray sensitivity of 4400pC/mR/cm², which translates to 1212 collected charges per absorbed x-ray. Resolution was measured to be near the theoretically predicted values, with a modulation of 63% at the Nyquist limit of 3.33 lp/mm. Phantom images were obtained at a frame rate of 15 frames per second, and negligible lag was observed in this image sequence.

Citation Download Citation

Martin Choquette, Henri Rougeot, Jean-Pierre Martin, Luc Laperriere, Ziad Shukri, and Brad T. Polischuk "Direct selenium x-ray detector for fluoroscopy, R&F, and radiography", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); https://doi.org/10.1117/12.384485

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