THE LENS COUPLING EFFICIENCY IN MEGAVOLTAGE IMAGING

被引：21

作者：

SWINDELL, W

机构：

[1] Department of Physics, Royal Marsden Hospital/Institute of Cancer Research, Ssqutton., Surrev

来源：

MEDICAL PHYSICS | 1991年 / 18卷 / 06期

关键词：

MEGAVOLTAGE IMAGING; PORTAL IMAGING; LENS EFFICIENCY;

D O I：

10.1118/1.596624

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

In TV-based megavoltage imaging systems it is useful to be able to estimate the geometrical efficiency g2 of the camera lens. It is shown that the appropriate expression is g2 = (16n2)-1 x [F(1 + 1/m)]-2, where n is the refractive index of the scintillator, F is the F-number of the lens and m is the optical magnification. This expression yields estimates for g2 that are 5 to 10 times smaller than the estimates that have appeared previously in the literature.

引用

页码：1152 / 1153

页数：2

共 6 条

[1]

BARRETT HH, 1981, RADIOLOGICAL IMAGING, P288

[2] LIGHT ANGULAR-DISTRIBUTION OF FLUORESCENT SCREENS EXCITED BY X-RAYS [J].