Evaluation of single scattering correction method in compton imaging system

Kim, Donghwan; Uenomachi, Mizuki; Shimazoe, Kenji; Takahashi, Hiroyuki

doi:10.1016/j.nima.2021.165568

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…SPECT typically uses mechanical collimators to determine the direction of gamma rays. In contrast, PET detects the coincidence of two 511 keV gamma rays emitted in opposite directions when a positron annihilates with an electron [4]. In contrast, Compton cameras use electronic collimators and do not require mechanical collimators for multinuclear imaging [5].…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of a Semiconductor Detector-Based Compton Imaging System with Efficiency Analysis

Niknami,

Hosseini,

Ebrahimi Loushab

2023

Preprint

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Compton cameras detect scattered gamma rays and estimate the distribution of gamma-ray sources. Nonetheless, crafting a camera tailored to a specific application presents formidable challenges, often necessitating the implementation of diverse image reconstruction techniques. Delving into the factors influencing these cameras can pave the way for design optimization and performance enhancement. This study introduces an inventive detector design for Compton imaging systems, building upon the achievements of prior designs. The proposed system contains eight scatterer detectors and a semiconductor absorber detector, spaced at 1 mm and 30 mm intervals, respectively. The source-to-first-scatterer-detector distance is 5 mm, with scatterer and absorber detector plates measuring 70× 70× 2.125 mm3 and 70× 70× 10 mm3, respectively. Geant4 simulation toolkit models the Compton imaging system, and an analytical method reconstructs Compton camera images. Unlike more straightforward techniques, the analytical method directly reconstructs Compton camera images by solving the equation relating to the reflected image data. This approach is implemented in the C++ programming language. The study's findings reveal that the analytical method discerns optimal conditions and parameters that significantly influence efficiency, yielding a full width at half maximum (FWHM) of 3.7 mm with an angular uncertainty of approximately 2.7 degrees at an energy level of 0.662 MeV. Compared to another experimental design employing the analytical image reconstruction approach, the FWHM value decreased by 0.7 mm. This study presents an innovative detector design and an analytical reconstruction method for Compton imaging systems, showcasing improved efficiency and accuracy.

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Section: Introductionmentioning

confidence: 99%

Design and Simulation of a Semiconductor Detector-Based Compton Imaging System with Efficiency Analysis

Niknami,

Hosseini,

Ebrahimi Loushab

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In SPECT, the gamma rays' direction is determined by a mechanical collimator. Using positron-emitting nuclides, PET can detect the coincidence of two 511 keV gamma rays that are emitted in opposite directions when a positron annihilates with an electron [4]. The Compton camera is an imaging system based on an electronic collimator [5].…”

Section: Introductionmentioning

confidence: 99%

Design and simulation of a semiconductor detector-based Compton imaging system with efficiency analysis

Niknami

Hosseini

Loushab

2022

Preprint

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Compton cameras have become widespread in recent years because it uses electronic collimators. One or more scatterer detectors and an absorber detector make up the Compton camera, which is sensitive to the energy and location of scattered gamma rays. It predicts the distribution of gamma-ray sources by reflecting all valid events in the image space using conical surfaces. Compton cameras are designed for specific applications and image reconstruction using various methods. Based on studies of the efficiency of the Compton camera, the current work provides a novel detector design that includes scatterer and absorber detectors. The Compton imaging system is simulated using the GEANT4 toolkit. In addition, this research uses an analytical method to reconstruct the Compton camera image. The method used for analytical reconstruction in the Compton imaging system differs slightly from the simple restoration methods used in other imaging systems. In the analytical method, the equation related to the data reflected by the image must be solved to reconstruct the image directly. In this method, C + + code required development to reconstruct images using the Compton camera. According to the results, using the analytical method to identify the best circumstances and the parameters impacting efficiency, the value of FWHM achieved was 3.7 mm with an angular uncertainty of about 2.7 at an energy of 0.662 MeV. Furthermore, the value of FWHM was decreased by 0.7 mm, compared to another (experimental) design that employed the analytical image reconstruction approach.

show abstract

“…In SPECT, the direction of gamma rays is determined using a mechanical collimator. Using positron-emitting nuclides, PET can detect the coincidence of two 511 keV gamma rays that are emitted in opposite directions when a positron annihilates with an electron [4]. A Compton camera is an imaging system based on an electronic collimator [5].…”

Section: Introductionmentioning

confidence: 99%

Design and simulation of a semiconductor detector-based Compton imaging system with efficiency analysis

Niknami

Hosseini

Loushab

2022

Preprint

View full text Add to dashboard Cite

In recent years, Compton cameras that use electronic collimators have become common. One or more scatterer detectors and an absorber detector make up the Compton camera, which is sensitive to the energy and location of scattered gamma rays. It predicts the distribution of gamma-ray sources by reflecting all valid events in the image space using conical surfaces. Compton cameras are designed for specific applications and image reconstruction using various methods. Based on studies on the efficiency of the Compton camera, the current work provides a novel detector design that includes scatterer and absorber detectors. This design includes eight scatterer detectors spaced 1 mm apart and an absorber detector 30 mm from the last scatterer detector. The distance between the source and the first scatterer detector was 5 mm. The scatterer and absorber detector plates were 70*70*2.125mm3 and 70*70*10mm3, respectively. The Compton imaging system is simulated using the GEANT4 toolkit. In addition, this study uses an analytical method to reconstruct Compton camera images. The method used for analytical reconstruction in the Compton imaging system differs slightly from simple restoration methods used in other imaging systems. In the analytical method, the equation related to the data reflected by the image must be solved to reconstruct the image directly. This method, the C++ code was developed to reconstruct Compton camera images. According to the results, using the analytical method to identify the best circumstances and the parameters impacting efficiency, the value of FWHM achieved was 3.7 mm with an angular uncertainty of about 2.7 at an energy of 0.662 MeV. Furthermore, the FWHM value decreased by 0.7 mm, compared to another (experimental) design that employed the analytical image reconstruction approach.

show abstract

Evaluation of single scattering correction method in compton imaging system

Cited by 6 publications

References 14 publications

Design and Simulation of a Semiconductor Detector-Based Compton Imaging System with Efficiency Analysis

Design and Simulation of a Semiconductor Detector-Based Compton Imaging System with Efficiency Analysis

Design and simulation of a semiconductor detector-based Compton imaging system with efficiency analysis

Design and simulation of a semiconductor detector-based Compton imaging system with efficiency analysis

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