A study of factors limiting spatial resolution using a 25 micron pixel pitch direct-detection amorphous selenium imaging system

Chris C. Scott; Nicholas Allec; Karim S. Karim

doi:10.1117/12.912429

3 March 2012 A study of factors limiting spatial resolution using a 25 micron pixel pitch direct-detection amorphous selenium imaging system

Chris C. Scott, Nicholas Allec, Karim S. Karim

Author Affiliations +

Proceedings Volume 8313, Medical Imaging 2012: Physics of Medical Imaging; 83135Y (2012) https://doi.org/10.1117/12.912429
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

Abstract

An amorphous selenium direct detector with a 25 μm pixel pitch is studied for mammography and fluoroscopy applications. In this paper we analyze spatial resolution by examining the main contributions to the inherent modulation transfer function (MTF) of amorphous selenium, such as primary photoelectron range and x-ray beam obliquity; and determine their significance relative to aperture MTF. Improvements in spatial resolution provided by a move to a small pixel size are complicated by deep carrier trapping. Trapped carriers cause residual charge induction across the pixel plane. We examine the significance of this effect on spatial resolution. The potential improvements of moving from a larger pixel pitch to a 25 μm pixel pitch are studied, including all significant effects, at selected pixel pitches.

Citation Download Citation

Chris C. Scott, Nicholas Allec, and Karim S. Karim "A study of factors limiting spatial resolution using a 25 micron pixel pitch direct-detection amorphous selenium imaging system", Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83135Y (3 March 2012); https://doi.org/10.1117/12.912429

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