Dosimetric comparison of an integrated multileaf-collimator versus a conventional collimator.
Dosimetric comparison of an integrated multileaf-collimator versus a conventional collimator.
复制标题
集成多叶准直器与传统准直器的剂量测定比较。
DOI：
10.1088/0031-9155/42/11/020
复制
发表时间：
1997
影响因子：
3.5
通讯作者：
A. Dutreix
中科院分区：
文献类型：
--
作者：
D. Georg;F. Julia;E. Briot;D. Huyskens;U. Wolff;A. Dutreix
比较了常规GE准直器（CC）和GE多叶准直器（MLC）在不同光子束能量下的剂量学特性。集成的GE MLC由32对钨叶组成，取代了传统准直器的下对钳口。在用MLC替换该准直器之前，使用传统准直器进行测量。加速器的所有部分，除了准直器保持不变。泄漏和传输测量结果与制造商的规范一致，说明所有能量的叶片之间的泄漏小于1%，通过叶片的传输小于0.5%。两个准直器的剂量测定特性是非常相似的方形和矩形领域。在测量精度范围内，未检测到射束质量、射束衰减和最大剂量深度的显著变化。MLC输出比变化小于用CC测量的变化。在体模中5 cm深度处，Y方向上的半影差异小于0.5 mm;在X方向上，MLC的半影由于圆形叶前缘而大1 mm。由于两个叶片组取代了下部一对准直器夹爪，因此两个准直器从准直器端到等中心的距离相似，因此MLC不会降低治疗单元的灵活性。对于对称和规则的准直器设置，MLC可以被视为CC。
The dosimetric characteristics of both a conventional GE collimator (CC) and a GE multileaf collimator (MLC) are compared for different photon beam energies. The integrated GE MLC consists of 32 pairs of tungsten leaves, replacing the lower pair of jaws of the conventional collimator. Measurements were performed with the conventional collimator before this collimator was replaced by the MLC. All parts of the accelerator except the collimator remained the same. Leakage and transmission measurements show good agreement with the manufacturer's specification, stating a leakage between leaves of less than 1% for all energies and a transmission through leaves of less than 0.5%. The dosimetric characteristics of both collimators are very similar for square and rectangular fields. No significant change in beam quality, beam attenuation and depth of maximum dose could be detected within the measurement accuracy. The MLC output ratio variation is smaller than the one measured with the CC. The penumbra difference in the Y direction is less than 0.5 mm at a depth of 5 cm in phantom; in the X direction the penumbra is 1 mm larger for the MLC due to the rounded leaf fronts. As the two leaf banks replace the lower pair of collimator jaws the distance from the collimator end to the isocentre is similar for the two collimators, therefore the MLC does not reduce the flexibility of the treatment unit. For symmetrical and regular collimator settings the MLC can be treated as the CC.
使用多叶准直器对前列腺癌和鼻咽癌进行适形放射治疗。
DOI：
10.1016/0360-3016(93)90337-u
发表时间：
1993
期刊：
International journal of radiation oncology, biology, physics
影响因子：
--
作者：
LoSasso,T;Chui,CS;Kutcher,GJ;Leibel,SA;Fuks,Z;Ling,CC
通讯作者：
Ling,CC
影响因子：
3.8
作者：
SPIROU, SV;CHUI, CS
通讯作者：
CHUI, CS