ORCID Profile
0000-0001-7776-6336
Current Organisations
National Institutes for Quantum and Radiological Science and Technology
,
Gunma University Hospital
,
University of Sydney
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Publications
Development and Applications of Compton Camera—A Review
Publisher: MDPI AG
Date: 28-09-2022
DOI: 10.3390/S22197374
Abstract: The history of Compton cameras began with the detection of radiation sources originally for applications in astronomy. A Compton camera is a promising γ-ray detector that operates in the wide energy range of a few tens of keV to MeV. The γ-ray detection method of a Compton camera is based on Compton scattering kinematics, which is used to determine the direction and energy of the γ-rays without using a mechanical collimator. Although the Compton camera was originally designed for astrophysical applications, it was later applied in medical imaging as well. Moreover, its application in environmental radiation measurements is also under study. Although a few review papers regarding Compton cameras have been published, they either focus very specifically on the detectors used in such cameras or the particular applications of Compton cameras. Thus, the aim of this paper is to review the features and types of Compton cameras and introduce their applications, associated imaging algorithms, improvement scopes, and their future aspects.
Annihilation gamma imaging for carbon ion beam range monitoring using Si/CdTe Compton camera
Publisher: IOP Publishing
Date: 20-02-2019
Abstract: In this study, we performed on-beam monitoring of 511 keV annihilation gamma emissions using a Compton camera. Beam monitoring experiments were conducted using carbon ion beams of 290 MeV/u irradiated on a polymethyl methacrylate (PMMA) phantom. The intensity of the beams was 3 × 10
Improved iterative reconstruction method for Compton imaging using median filter
Publisher: Public Library of Science (PLoS)
Date: 06-03-2020
Effect of number of views on cross-sectional Compton imaging: A fundamental study with backprojection
Publisher: Elsevier BV
Date: 12-2018
DOI: 10.1016/J.EJMP.2018.11.006
Abstract: We have been developing a medical imaging technique using a Compton camera, which is expected to reconstruct three-dimensional images. If the number of views is not sufficient, star-shaped artifacts (streak artifacts) could arise in cross-sectional images. Therefore, we estimated the point spread function (PSF) of cross-sectional Compton images and the effect of the number of views by Monte Carlo simulations and experimental studies. A cross-sectional Compton image was reconstructed using a dataset comprising 719 view directions and PSF was analyzed using a radial distribution. The peak height, full width at half maximum (FWHM), background (BG), and residual sum of squares (RSS) were calculated from the obtained PSF. In addition, RSSs were plotted against the number of views to estimate the required number to suppress star-shaped artifacts. There was no correlation found between the number of views and both FWHM (16 mm) and peak/BG ratio (∼1 × 10 We determined the PSF of cross-sectional Compton images and the effect of the number of views on the images. The required number of views to suppress the star-shaped artifact is related to the square root of the number of Compton events used to reconstruct the image. From this study, we concluded that 21 or more views are required for clinical purposes.
Related Organisations
National Institutes For Quantum And Radiological Science And Technology
Location: Japan
Related Funding Activities
No related grants have been discovered for Raj Kumar Parajuli.