Photon-counting CBCT iterative reconstruction for adaptive proton therapy

Takashi Yamaguchi; Kiyotaka Akabori

doi:10.1117/12.2534756

28 May 2019 Photon-counting CBCT iterative reconstruction for adaptive proton therapy

Takashi Yamaguchi, Kiyotaka Akabori

Author Affiliations +

Proceedings Volume 11072, 15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine; 110721M (2019) https://doi.org/10.1117/12.2534756
Event: Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, 2019, Philadelphia, United States

Abstract

Cone beam computed tomography (CBCT) is used to determine a patient position in proton therapy, but its image quality is low compared to that of a conventional CT because data measured by a two-dimensional detector used in CBCT contain scattered X-ray components. Correcting for scattered X-rays using the Klein-Nishina’s formula can improve CBCT image quality, but the formula requires the atomic number and number density of substances. In this work, we developed a photon-counting image reconstruction method for estimating the atomic number and number density using the energy information of X-rays. When the developed method was applied to an X-ray energy spectrum of a gantry-mounted CBCT which was simulated with a Monte Carlo simulation code, it was possible to distinguish soft tissues from water in the simulated object, which was not possible without the energy information. An atomic number and number density obtained with our method allows to calculate the stopping power of protons more accurately, which can contribute to improving dose calculation accuracy.

Citation Download Citation

Takashi Yamaguchi and Kiyotaka Akabori "Photon-counting CBCT iterative reconstruction for adaptive proton therapy", Proc. SPIE 11072, 15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, 110721M (28 May 2019); https://doi.org/10.1117/12.2534756

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KEYWORDS

X-rays

Monte Carlo methods

Signal attenuation

X-ray imaging

Image quality

Image restoration

X-ray computed tomography

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