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1 May 1994 Evaluation of the MTF for a-Si:H imaging arrays
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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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);

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