Unintended attenuation in the Leksell Gamma Knife® Perfexion™ calibration-phantom adaptor and its effect on dose calibration

被引：16

作者：

Bhatnagar, Jagdish P. ^{[1
]}

Novotny, Josef, Jr. ^{[1
]}

Quader, Mubina A. ^{[1
]}

Bednarz, Greg ^{[1
]}

Huq, M. Saiful ^{[1
]}

机构：

[1] Univ Pittsburgh, Inst Canc, Dept Radiat Oncol, Pittsburgh, PA 15217 USA

来源：

MEDICAL PHYSICS | 2009年 / 36卷 / 04期

关键词：

calibration; dosimeters; dosimetry; phantoms; OUTPUT FACTORS; RADIOSURGERY; BEAMS;

D O I：

10.1118/1.3093240

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：

The calibration of Leksell Gamma Knife Perfexion (LGK PFX) is performed using a spherical polystyrene phantom 160 mm in diameter, which is provided by the manufacturer. This is the same phantom that has been used with LGK models U, B, C, and 4C. The polystyrene phantom is held in irradiation position by an aluminum adaptor, which has stainless steel side-fixation screws. The phantom adaptor partially attenuates the beams from sectors 3 and 7 by 3.2% and 4.6%, respectively. This unintended attenuation introduces a systematic error in dose calibration. The overall effect of phantom-adaptor attenuation on output calibration of the LGK PFX unit is to underestimate output by about 1.0%.

引用

页码：1208 / 1211

页数：4

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