Weighted singular value decomposition (wSVD) to improve the radiation dose efficiency of grating-based x-ray phase contrast imaging with a photon counting detector

Xu Ji; Yongshuai Ge; Ran Zhang; Ke Li; Guang-Hong Chen

doi:10.1117/12.2255014

9 March 2017 Weighted singular value decomposition (wSVD) to improve the radiation dose efficiency of grating-based x-ray phase contrast imaging with a photon counting detector

Xu Ji, Yongshuai Ge, Ran Zhang, Ke Li, Guang-Hong Chen

Author Affiliations +

Proceedings Volume 10132, Medical Imaging 2017: Physics of Medical Imaging; 101325I (2017) https://doi.org/10.1117/12.2255014
Event: SPIE Medical Imaging, 2017, Orlando, Florida, United States

Abstract

The noise performance of grating-based differential phase contrast (DPC) imaging system is strongly dependent on the fringe visibility of the grating interferometer. Since the grating interferometer system is usually designed to be operated at a specific energy, deviation from that energy may lead to visibility loss and increased noise. By incorporating an energy-discriminating photon counting detector (PCD) into the system, photons with energies close to the operation energy of the interferometer can be selected, which offers the possibility of contrast-tonoise ratio (CNR) improvement. In our previous work, a singular value decomposition (SVD)-based rank one approximation method was developed to improve the CNR of DPC imaging. However, as the noise level and energy sensitivity of the interferometer may vary significantly from one energy bin to another, the signal and noise may not be separated well using the previously proposed method, therefore the full potential of the SVD method may not be achieved. This work presents a weighted SVD-based method, which maintains the noise reduction capability regardless of the similarity in the noise level across energy bins. The optimal weighting scheme was theoretically derived, and experimental phantom studies were performed to validate the theory and demonstrate the improved radiation dose efficiency of the proposed weighted SVD method.

Citation Download Citation

Xu Ji, Yongshuai Ge, Ran Zhang, Ke Li, and Guang-Hong Chen "Weighted singular value decomposition (wSVD) to improve the radiation dose efficiency of grating-based x-ray phase contrast imaging with a photon counting detector", Proc. SPIE 10132, Medical Imaging 2017: Physics of Medical Imaging, 101325I (9 March 2017); https://doi.org/10.1117/12.2255014

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KEYWORDS

Imaging systems

Interferometers

Signal to noise ratio

Interference (communication)

X-rays

Sensors

Visibility

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