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PTSIM is a particle therapy system simulation framework based on Geant4 Monte Carlo simulation toolkit. It was originally developed as a reliable dose calculation tool to verify dose distributions inside patient and dose calculation algorithms in treatment planning systems. Besides such a reliable dose calculation, an irradiation field monitoring is desirable for delivering dose with more ideal distribution...
For MeV gamma-ray Astronomy, we have developed an Electron Tracking Compton Camera (ETCC) as a next-generation MeV gamma-ray telescope. An ETCC consists of a three-dimensional electron tracker using a gaseous time projection chamber (TPC) and position-sensitive gamma-ray absorbers using pixel scintillator arrays (PSAs). We carried out the balloon borne experiment in 2006 with a small size ETCC and...
For MeV gamma ray astronomy, we have developed an Electron Tracking Compton Camera (ETCC) as a MeV gamma ray telescope in the next generation. Our detector consists of a gaseous Time Projection Chamber (TPC), which uses μ-PIC as the two-dimensional readout detector, and a position sensitive scintillation camera. We launched a small size ETCC with a 10 cm × 10 cm × 15 cm TPC loaded on a balloon in...
A new detector employing a time projection chamber built on the micro-pixel gaseous chamber (μPIC) and an FPGA (Field Programmable Gate Array)-based data acquisition system has been developed as a thermal-neutron imaging detector for small-angle neutron scattering (SANS) and neutron radiography. A small amount of 3He added to the gas mixture is used as the neutron absorber, giving a detection efficiency...
We have developed an electron-tracking Compton camera (ETCC) for new imaging reagents study. Energy limitation of gamma camera is major problem for this study. However, our ETCC has a wide energy dynamic range (200-1300 keV). In this paper, we show the results of imaging reagent study as follows: (1) F-18-FDG (511 keV) and I-131-MIBG (364 keV) simultaneous imaging for double clinical tracer imaging,...
We developed an image restoration method for an advanced Compton camera (ACC) making use of Compton scattering and recoiled electrons. In this paper, we simulated a system with two ACCs located perpendicular to each other with an Electron Gamma Shower ver.5 (EGS5) code, and reconstructed images with a modified source space tree algorithm. Moreover, we deblurred the reconstructed images with a parametric...
A new detector employing the micro-pixel gaseous chamber (μPIC) is currently being developed as a thermal neutron imaging detector for applications in small angle neutron scattering (SANS), neutron radiography, and radioactive material detection. Neutron detection is achieved through the 3He(n, p)3H absorption reaction by adding 3He to the usual Argon-Ethane gas mixture. The μPIC, with a pixel pitch...
Compton Camera has a potential for nuclear medicine. Because energy dynamic range and field of view is wide. Electron Tracking Compton Camera (ETCC) which we have developed consists of two detectors micro Time Projection Chamber (μTPC) and Pixel Scintillator Array (PSA). We have developed two type of ETCC small and large, and we have evaluated these cameras and have imaged phantom and small animal.
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