MTF measurements with high-resolution a-Si:H imaging arrays

John Yorkston; Larry E. Antonuk; N. Seraji; Weidong Huang; Jeffrey H. Siewerdsen; Youcef El-Mohri

doi:10.1117/12.208344

8 May 1995 MTF measurements with high-resolution a-Si:H imaging arrays

John Yorkston, Larry E. Antonuk, N. Seraji, Weidong Huang, Jeffrey H. Siewerdsen, Youcef El-Mohri

Proceedings Volume 2432, Medical Imaging 1995: Physics of Medical Imaging; (1995) https://doi.org/10.1117/12.208344
Event: Medical Imaging 1995, 1995, San Diego, CA, United States

Abstract

Recent advances in a-Si:H fabrication technology have opened the way for the application of flat panel imaging arrays in a number of areas in medical imaging. Their large area (up to approximately 26 X 26 cm), thin profile (< 1 mm) and real time readout capability make them strong candidates for the replacement of more traditional x-ray imaging technologies such as film and image intensifier systems. As a first step towards a device suitable for clinical use we have created a 24.4 X 19.4 cm array with 127 micrometers pitch pixels. This device serves as a testbed for investigating the effects of design changes on array imaging performance. This paper reports on initial measurements of the spatial resolution of this device used in conjunction with an overlaying Lanex Regular screen and 90 kVp x rays. The measured pre-sampled modulation transfer function (p.s. MTF) is found to fall below the predicted value by up to approximately 8%. At least part of this reduction seems to be due to scattering of light photons between the array and the surface of the phosphor screen contacting the array.

Citation Download Citation

John Yorkston, Larry E. Antonuk, N. Seraji, Weidong Huang, Jeffrey H. Siewerdsen, and Youcef El-Mohri "MTF measurements with high-resolution a-Si:H imaging arrays", Proc. SPIE 2432, Medical Imaging 1995: Physics of Medical Imaging, (8 May 1995); https://doi.org/10.1117/12.208344

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