CLINICAL DOSIMETRY FOR IMPLEMENTATION OF A MULTILEAF COLLIMATOR

被引:99
作者
BOYER, AL [1 ]
OCHRAN, TG [1 ]
NYERICK, CE [1 ]
WALDRON, TJ [1 ]
HUNTZINGER, CJ [1 ]
机构
[1] VARIAN ASSOCIATES INC,MED EQUIPMENT,PALO ALTO,CA 94303
关键词
X-RAY DOSIMETRY; MULTILEAF COLLIMATORS;
D O I
10.1118/1.596757
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 order to initiate the use of a multileaf collimator (MLC) in the clinic, a set of technical procedures needs to be available sufficient to create MLC leaf settings and to deliver an accurate dose of radiation through the MLC-shaped field. Dosimetry data for clinical use of the MLC were measured. Dosimetric characteristics included central axis percent depth dose, output factors, and penumbra. In this paper, it has been concluded that a dose control monitor unit calculation procedure that has been applied to the use of conventional secondary field-shaping blocks can be applied to the multileaf collimator dosimetry. The multileaf collimator penumbra (20% to 80%) is only slightly wider (1-3 mm) than the penumbra of the conventional collimator jaws. Beam's-eye-view comparisons made between the isodose curves in fields shaped by conventional Cerrobend blocks and isodose curves in fields shaped by the multileaf collimator demonstrated that the 50% isodose line at 10-cm depth exhibited the discrete steps of the multileaf collimator leaves, but that the 90% and 10% isodose curves of the multileaf were close to those shaped by Cerrobend blocks.
引用
收藏
页码:1255 / 1261
页数:7
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