摘要
光子照射野中引入楔形滤片将导致射线辐射质发生改变，继而使楔形野与平野相比，深度剂量发生改变。本文研究楔形野和平野两种情况下的辐射质差异，发现辐射质指数Ｉ变化达２．９％，最大剂量点深度变化达４ｍｍ。为精确治疗，我们建议应测量楔形野的剂量数据。
The presence of wedge filter in the photo field will cause the change of beam quality which results in the modification of depth dose distribution comparing with that in the open field.This study iams at quantitation of these phenomena and finds out the diferences of 2.9% in beam quality index and of 4 mm in Dmax.We suggest the measurement of wedge field depth dose for the accurate dosimetry.
出处
《中国医学物理学杂志》
CSCD
1999年第2期67-69,共3页
Chinese Journal of Medical Physics
关键词
楔形滤片
辐射质
剂量分布
X线
wedge filter
radiation quality
dose distribution
