射线源焦点及探测器对CT图象质量的影响  

EFFECT OF FOCAL SPOT AND DETECTOR ON CT IMAGE QUALITY

作　　者：吕红[1] 李时光[2] 

机构地区：[1]第三军医大学第一附属医院设备科 [2]重庆大学电子信息工程学院,重庆630044

出　　处：《无损检测》1998年第4期96-98,共3页Nondestructive Testing

摘　　要：射线源焦点及探测器孔径大小是导致CT图象降质的主要因素.推导不同的射线源光强分布下系统点扩展函数公式,分析射线源焦点直径及探测器孔径与空间分辨力的关系。The sizes of focal spot and detector aperture are the factors affecting CT image quality. The typical point spread functional formulas under different focal spot intensity distributions are derived. The relationship between the spatial resolution and the dimensions of focal spot and detector aperture, as well as the causes resulting rotating blur in image reconstruction are discussed.

关 键 词：空间分辨力 射线源焦点 探测器 射线成像 

分 类 号：TB302.5[一般工业技术—材料科学与工程]