具有不对称准直器钳口的直线加速器产生的6兆伏光子束的剂量学特征

Dosimetric characteristics of a 6 MV photon beam from a linear accelerator with asymmetric collimator jaws.

作者信息

Palta J R, Ayyangar K M, Suntharalingam N

机构信息

Thomas Jefferson University Hospital, Department of Radiation Therapy and Nuclear Medicine, Philadelphia, PA 19107.

出版信息

Int J Radiat Oncol Biol Phys. 1988 Feb;14(2):383-7. doi: 10.1016/0360-3016(88)90447-6.

DOI:10.1016/0360-3016(88)90447-6

PMID:3338959

Abstract

Dosimetric measurements have been made of a 6 MV photon beam from a linear accelerator equipped with asymmetric jaws. The field size factors for asymmetrically set fields are compared to those for symmetrically set fields. The change of beam quality has been measured as a function of off-axis position of the asymmetric fields to assess its effect on depth dose. Additional measurements include beam penumbra and shape of isodose curves for open and wedge fields as the field opening is moved asymmetrically from the central ray.

摘要

已对配备不对称准直器的直线加速器产生的6兆伏光子束进行了剂量测量。将不对称设置射野的射野尺寸因子与对称设置射野的射野尺寸因子进行了比较。已测量了射束质量随不对称射野离轴位置的变化，以评估其对深度剂量的影响。额外的测量包括当射野开口从中心轴不对称移动时，开放射野和楔形射野的射束半值层及等剂量曲线形状。