Hoshi M, Nakano M, Maki T, Onizuka Y, Cho T, Uehara S, Konishi K, Toyofuku F, Nagoshi C, Takai N
J UOEH. 1984 Mar 1;6(1):67-73. doi: 10.7888/juoeh.6.67.
A method of externally observing the stop-region of pi- meson for monitoring during exposure to a patient is discussed. Negative pi mesic X-rarys, gamma-rays and neutrons are emitted from the region where pi- mesons stop and produce stars. These radiations can be detected outside the exposed patient. Water phantom as normal tissue equivalent material was exposed by pi- mesons at various depths. The resulting gamma-ray yields were determined by counting the gamma-rays in coincidence with incident pi- mesons using a sodium iodide (NaI) detector. This type of gamma-ray measuring system is useful to make sure that the peak position of the depth-dose distribution in the patient is exactly situated at the desired one during exposure. It is suggested that the scintillation camera with a multiholecollimator is a powerful and convenient tool for the two dimensional peak positioning.
讨论了一种在对患者进行照射期间用于监测的外部观察π介子停止区域的方法。负π介子停止并产生星迹的区域会发射负π介子X射线、γ射线和中子。这些辐射可以在受照射患者体外被检测到。用水模体作为正常组织等效材料，在不同深度用π介子进行照射。使用碘化钠（NaI）探测器通过对与入射π介子符合的γ射线进行计数来确定产生的γ射线产额。这种γ射线测量系统有助于确保在照射期间患者体内深度剂量分布的峰值位置恰好位于所需位置。有人提出，带有多孔准直器的闪烁相机是用于二维峰值定位的强大且便捷的工具。
