THICK PHOSPHOR SCREENS FOR ONLINE PORTAL IMAGING

被引：8

作者：

WOWK, B ^{[1
]}

SHALEV, S ^{[1
]}

机构：

[1] MANITOBA CANC TREATMENT & RES FDN,WINNIPEG R3E 0V9,MB,CANADA

来源：

MEDICAL PHYSICS | 1994年 / 21卷 / 08期

关键词：

ONLINE PORTAL IMAGING; FLUORESCENT SCREENS; PHOSPHORS;

D O I：

10.1118/1.597209

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：

Gd2O2S phosphor screens between 250 and 1000 mg/cm(2) thick were evaluated for use in megavoltage imaging systems. The phosphor layers were placed on brass plates ranging from 1 to 5 mm thick, each with and without an optical back reflector (white paint). Light output and spatial resolution were measured at 6- and 23-MV x-ray energies. Light output was found to increase linearly with phosphor thickness up to 500 mg/cm(2), reaching a plateau at 1000 mg/cm(2). Spatial resolution [modulation transfer function (MTF)] decreased exponentially with phosphor thickness up to 750 mg/cm(2), where a minimum was reached. The variation of MTF with phosphor thickness was found to obey a simple empirical relation.

引用

页码：1269 / 1276

页数：8

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