http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Geometric Sensitivity of Variable Pinhole SPECT with a Keel-edge Pinhole Model
차혜미,정영준,이기성,이학재,배승빈,배재건 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.3
A variable pinhole (VP) collimator is formed by stacking several tungsten plates with dierent apertures. The conguration of the VP can be optimized for target region-of-interests at dierent rotation angles. Hence, both the resolution and sensitivity of the system can be improved. However, it is dicult to analytically implement the exact system model that simulates the step shapes between adjacent layers. In this study, we compared the conventional keel-edge and knife-edge pinhole models with the VP model using simulations. The keel-edge and knife-edge models were evaluated based on various specications to identify the optimum system model. The simulation results showed that the keel-edge model with 80% channel length (keel-edge 80%) elicits the best performance with a xed acceptance angle and pinhole plate thickness. The results in this study are expected to be applied to full-scale SPECT with a VP collimator which is currently under development.