
Proceedings Paper
A new image reconstruction method to improve noise properties in x-ray differential phase contrast computed tomographyFormat | Member Price | Non-Member Price |
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Paper Abstract
The noise properties of differential phase contrast CT (DPC-CT) demonstrate some peculiar features. It has
been both theoretically and experimentally demonstrated that the noise variance of DPC-CT scales with spatial
resolution following an inverse first order relationship. This is in stark contrast to absorption CT, where the noise
variance scales with spatial resolution following an inverse third power. In addition to the scaling relationship,
the noise power spectrum (NPS) of DPC-CT is dominated by low spatial frequencies and demonstrates a singular
behavior when approaching zero frequency. This focuses the peak noise power within low spatial frequencies while
high-frequency noise is suppressed. This is again in contrast to the absorption CT case where the NPS smoothly
transitions to zero at zero frequency. The singular behavior of the DPC-CT NPS visually affects image noise
texture and may hinder observer perception. In this paper, a method is proposed to improve the noise properties
in DPC-CT and potentially improve observer performance. Specifically, the low frequency component of the
filtering kernel used in reconstruction has been regularized to modify the noise power at low spatial frequencies.
This results in a high-pass filtering of the image. The high-pass filtered image is combined with the original
image to generate the final image. As a result of these two operations, the noise power is shifted to the high
spatial frequency direction, improving visual perception, while image reconstruction accuracy is maintained.
Experimental phantom results are presented to validate the proposed method.
Paper Details
Date Published: 3 March 2012
PDF: 8 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83131V (3 March 2012); doi: 10.1117/12.911604
Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)
PDF: 8 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83131V (3 March 2012); doi: 10.1117/12.911604
Show Author Affiliations
Ke Li, Univ. of Wisconsin-Madison (United States)
Nicholas Bevins, Univ. of Wisconsin-Madison (United States)
Nicholas Bevins, Univ. of Wisconsin-Madison (United States)
Joseph Zambelli, Univ. of Wisconsin-Madison (United States)
Guang-Hong Chen, Univ. of Wisconsin-Madison (United States)
Guang-Hong Chen, Univ. of Wisconsin-Madison (United States)
Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)
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