2018
DOI: 10.1088/1361-6560/aaa453
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A carbon CT system: how to obtain accurate stopping power ratio using a Bragg peak reduction technique

Abstract: In this study, we investigate the performance of the Gunma University Heavy Ion Medical Center's ion computed tomography (CT) system, which measures the residual range of a carbon-ion beam using a fluoroscopy screen, a charge-coupled-device camera, and a moving wedge absorber and collects CT reconstruction images from each projection angle. Each 2D image was obtained by changing the polymethyl methacrylate (PMMA) thickness, such that all images for one projection could be expressed as the depth distribution in… Show more

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Cited by 5 publications
(4 citation statements)
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“…To calculate the WEL of each sample, following the methods, 17,20,21 the integral depth dose (IDD) near the Bragg peak was measured using an ionization chamber with concentric electrodes (ICCE) contained in a water tank at the horizontal port of the EJHIC. The IDDs of the Bragg curve were measured with no sample and when a sample was placed vertically in front of the water tank.…”
Section: Measured Values Of Ct Number and Welmentioning
confidence: 99%
“…To calculate the WEL of each sample, following the methods, 17,20,21 the integral depth dose (IDD) near the Bragg peak was measured using an ionization chamber with concentric electrodes (ICCE) contained in a water tank at the horizontal port of the EJHIC. The IDDs of the Bragg curve were measured with no sample and when a sample was placed vertically in front of the water tank.…”
Section: Measured Values Of Ct Number and Welmentioning
confidence: 99%
“…It can hold up to seven samples, each with a 5 mm diameter and 65 mm height. Water fills the space surrounding the sample rods [31]. An energy-differentiation-type 64-channel cadmium telluride (CdTe) radiation line sensor module (C10413, Hamamatsu, Japan) was used as the imaging system.…”
Section: Photon-counting Ct Systemmentioning
confidence: 99%
“…Seven rod-shaped samples were placed in a water-filled sample holder. The seven materials used for the samples were aluminium, graphite, PMMA, and four types of biological phantom materials (Kyoto Kagaku, Japan), that is, BE-T-10, BE-H-10, BE-N-10, and WD-3010, mimicking the properties of compact bone, cortical bone, internal bone, and water, respectively [31]. For the experimental conditions, the X-ray tube voltage and current were set at 150 kV and 40 µA, respectively, with focal spot sizes of 7 µm.…”
Section: Photon-counting Ct Systemmentioning
confidence: 99%
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