A new image reconstruction method was developed for a Compton camera. A simulation to determine a γ-ray source position was performed by using the simulation tool, GEANT4. An image reconstruction was made in two step...A new image reconstruction method was developed for a Compton camera. A simulation to determine a γ-ray source position was performed by using the simulation tool, GEANT4. An image reconstruction was made in two steps. First, a three dimensional image was constructed and projected in one selected plane, then the points from each ellipse was picked up by taking the peak points of a density distribution of crossing points between the ellipse and the first step image. The second step procedure improved the accuracy and the spatial resolution of a position de- termination significantly, comparing with the image obtained by only the first step. The accuracy and the resolution for a point source were obtained to be about 0.02 mm and (1.35±0.15) mm, respectively. The same procedure was applied to an imaging of the distributed γ-ray source.展开更多
A series of software has been developed for small-scale data acquisition and analysis systems.Various classes were written un C++ and partly in Java,and a Private protocol was introduced for object persistency.A demon...A series of software has been developed for small-scale data acquisition and analysis systems.Various classes were written un C++ and partly in Java,and a Private protocol was introduced for object persistency.A demonstrationn system was built and the performance was tested in a beam test at KEK-PS.展开更多
文摘A new image reconstruction method was developed for a Compton camera. A simulation to determine a γ-ray source position was performed by using the simulation tool, GEANT4. An image reconstruction was made in two steps. First, a three dimensional image was constructed and projected in one selected plane, then the points from each ellipse was picked up by taking the peak points of a density distribution of crossing points between the ellipse and the first step image. The second step procedure improved the accuracy and the spatial resolution of a position de- termination significantly, comparing with the image obtained by only the first step. The accuracy and the resolution for a point source were obtained to be about 0.02 mm and (1.35±0.15) mm, respectively. The same procedure was applied to an imaging of the distributed γ-ray source.
文摘A series of software has been developed for small-scale data acquisition and analysis systems.Various classes were written un C++ and partly in Java,and a Private protocol was introduced for object persistency.A demonstrationn system was built and the performance was tested in a beam test at KEK-PS.
