Evaluation of the MTF for a-Si:H imaging arrays

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

doi:10.1117/12.174249

1 May 1994 Evaluation of the MTF for a-Si:H imaging arrays

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

Proceedings Volume 2163, Medical Imaging 1994: Physics of Medical Imaging; (1994) https://doi.org/10.1117/12.174249
Event: Medical Imaging 1994, 1994, Newport Beach, CA, United States

Abstract

Hydrogenated amorphous silicon imaging arrays are being developed for numerous applications in medical imaging. Diagnostic and megavoltage images have previously been reported and a number of the intrinsic properties of the arrays have been investigated. This paper reports on the first attempt to characterize the intrinsic spatial resolution of the imaging pixels on a 450 micrometers pitch, n-i-p imaging array fabricated at Xerox P.A.R.C. The pre- sampled modulation transfer function was measured by scanning a approximately 25 micrometers wide slit of visible wavelength light across a pixel in both the DATA and FET directions. The results show that the response of the pixel in these orthogonal directions is well described by a simple model that accounts for asymmetries in the pixel response due to geometric aspects of the pixel design.

Citation Download Citation

John Yorkston, Larry E. Antonuk, N. Seraji, Weidong Huang, Jeffrey H. Siewerdsen, and Youcef El-Mohri "Evaluation of the MTF for a-Si:H imaging arrays", Proc. SPIE 2163, Medical Imaging 1994: Physics of Medical Imaging, (1 May 1994); https://doi.org/10.1117/12.174249

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