ACTIVITY DISTRIBUTION OF A CO-60 TELETHERAPY SOURCE

被引：5

作者：

JAFFRAY, DA ^{[4
]}

MUNRO, P

BATTISTA, JJ

FENSTER, A

机构：

[1] LONDON REG CANC CTR,LONDON N6A 4L6,ONTARIO,CANADA

[2] ROBARTS RES INST,IMAGING RES LABS,LONDON N6A 5K8,ONTARIO,CANADA

[3] UNIV WESTERN ONTARIO,DEPT RADIOL,LONDON N6A 3K7,ONTARIO,CANADA

[4] UNIV WESTERN ONTARIO,DEPT MED BIOPHYS,LONDON N6A 3K7,ONTARIO,CANADA

来源：

MEDICAL PHYSICS | 1991年 / 18卷 / 02期

关键词：

CO-60; STRIP INTEGRAL; PORTAL IMAGING; SPATIAL RESOLUTION;

D O I：

10.1118/1.596672

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 the course of quantifying the effect of radiation source size on the spatial resolution of portal images, a concentric ring structure in the activity distribution of a Cobalt-60 teletherapy source has been observed. The activity distribution was measured using a strip integral technique and confirmed independently by a contact radiograph of an identical but inactive source replica. These two techniques suggested that this concentric ring structure is due to the packing configuration of the small Co-60 pellets that constitute the source. The source modulation transfer function (MTF) showed that this ring structure has a negligible influence on the spatial resolution of therapy images when compared to the effect of the large size of the Co-60 source.

引用

页码：288 / 291

页数：4

共 21 条

[1]

BAILY NA, 1980, INT J RADIAT ONCOL, V6, P935, DOI 10.1016/0360-3016(80)90341-7

[2] PRINCIPLES OF COMPUTER-ASSISTED TOMOGRAPHY (CAT) IN RADIOGRAPHIC AND RADIOISOTOPIC IMAGING [J].

BROOKS, RA ;

DICHIRO, G .

PHYSICS IN MEDICINE AND BIOLOGY, 1976, 21 (05) :689-732

[3] WEEKLY LOCALIZATION FILMS AND DETECTION OF FIELD PLACEMENT ERRORS [J].

BYHARDT, RW ;

COX, JD ;

HORNBURG, A ;

LIERMANN, G .

INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS, 1978, 4 (9-10) :881-887

[4] IMMOBILIZATION ERROR - SOME THEORETICAL CONSIDERATIONS [J].

GOITEIN, M ;

BUSSE, J .

RADIOLOGY, 1975, 117 (02) :407-412

[5] THE DAILY REPRODUCIBILITY OF LARGE, COMPLEX-SHAPED RADIOTHERAPY FIELDS TO THE THORAX AND NECK [J].

GRIFFITHS, SE ;

PEARCEY, RG .

CLINICAL RADIOLOGY, 1986, 37 (01) :39-41

[6] MONTE-CARLO SIMULATION OF A CO-60 BEAM [J].

HAN, K ;

BALLON, D ;

CHUI, C ;

MOHAN, R .

MEDICAL PHYSICS, 1987, 14 (03) :414-419

[7]

HUESMAN RH, 1977, L BERKELEY LABORATOR, V214

[8] ACCURACY IN RADIATION-FIELD ALIGNMENT IN HEAD AND NECK-CANCER - A PROSPECTIVE-STUDY [J].

HUIZENGA, H ;

LEVENDAG, PC ;

DEPORRE, PMZR ;

VISSER, AG .

RADIOTHERAPY AND ONCOLOGY, 1988, 11 (02) :181-187

[9]

KINZIE JJ, 1983, CANCER, V52, P2223, DOI 10.1002/1097-0142(19831215)52:12<2223::AID-CNCR2820521209>3.0.CO

[10]

2-D

← 1 2 3 →