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Proceedings Paper

Monte Carlo analysis of relation between patient dose and noise characteristic of a flat-panel detector for cone-beam CT
Author(s): Nobuyuki Nakamori; Yi-Qiang Yang; Yasuo Yoshida; Takanori Tsunoo; Masahiro Endo; Kazumasa Sato
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Paper Abstract

We have examined the characteristic of a flat-panel detector used for our cone-beam CT scanner. We calculated detection efficiency, the modulation transfer function and the noise characteristic of flat-panel detector by the Monte Carlo method, and compared the results with experiment data. From these data, we estimate the relation between the patient dose and signal-to-noise ratio of projection data of CT image. Furthermore, to reduce the patient dose, we have examined the effect of removing the noise from projection degraded by quantum mottle, by the wavelet analysis. Our preliminary results show that de-noising of projection data with wavelet analysis has an effect to reduce the patient dose to less than 1/10, without decreasing the quality of CT image.

Paper Details

Date Published: 3 May 2002
PDF: 8 pages
Proc. SPIE 4682, Medical Imaging 2002: Physics of Medical Imaging, (3 May 2002);
Show Author Affiliations
Nobuyuki Nakamori, Kyoto Institute of Technology (Japan)
Yi-Qiang Yang, Kyoto Institute of Technology (Japan)
Yasuo Yoshida, Kyoto Institute of Technology (Japan)
Takanori Tsunoo, National Institute of Radiological Sciences (Japan)
Masahiro Endo, National Institute of Radiological Sciences (Japan)
Kazumasa Sato, Sony Corp. (Japan)

Published in SPIE Proceedings Vol. 4682:
Medical Imaging 2002: Physics of Medical Imaging
Larry E. Antonuk; Martin Joel Yaffe, Editor(s)

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