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Proceedings Paper

Focal spot deblurring for high resolution direct conversion x-ray detectors
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Paper Abstract

Small pixel high resolution direct x-ray detectors have the advantage of higher spatial sampling and decreased blurring characteristic. The limiting factors for such systems becomes the degradation due to the focal spot size. One solution is a smaller focal spot; however, this can limit the output of the x-ray tube. Here a software solution of deconvolving with an estimated focal spot blur is presented. To simulate images from a direct detector affected with focal-spot blur, first a set of high-resolution stent images (FRED from Microvention, Inc., Tustin, CA) were acquired using a 75μm pixel size Dexela-Perkin-Elmer detector and frame averaged to reduce quantum noise. Then the averaged image was blurred with a known Gaussian blur. To add noise to the blurred image a flat-field image was multiplied with the blurred image. Both the ideal and the noisy-blurred images were then deconvolved with the known Gaussian function using either threshold-based inverse filtering or Weiner deconvolution. The blur in the ideal image was removed and the details were recovered successfully. However, the inverse filtering deconvolution process is extremely susceptible to noise. The Weiner deconvolution process was able to recover more of the details of the stent from the noisy-blurred image, but for noisier images, stent details are still lost in the recovery process.

Paper Details

Date Published: 31 March 2016
PDF: 10 pages
Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97833R (31 March 2016); doi: 10.1117/12.2216916
Show Author Affiliations
S. V. Setlur Nagesh, Toshiba Stroke and Vascular Research Ctr. (United States)
R. Rana, Toshiba Stroke and Vascular Research Ctr. (United States)
M. Russ, Toshiba Stroke and Vascular Research Ctr. (United States)
Ciprian N. Ionita, Toshiba Stroke and Vascular Research Ctr. (United States)
D. R. Bednarek, Toshiba Stroke and Vascular Research Ctr. (United States)
S. Rudin, Toshiba Stroke and Vascular Research Ctr. (United States)


Published in SPIE Proceedings Vol. 9783:
Medical Imaging 2016: Physics of Medical Imaging
Despina Kontos; Thomas G. Flohr, Editor(s)

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