Polarity correction factor for flattening filter free photon beams in several cylindrical ionization chambers.
Polarity correction factor for flattening filter free photon beams in several cylindrical ionization chambers.
复制标题
用于在多个圆柱形电离室中平坦化无滤波器光子束的极性校正因子。
DOI：
10.1007/s12194-016-0348-3
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发表时间：
2016
影响因子：
1.6
通讯作者：
Takanobu Okayama
中科院分区：
文献类型：
--
作者：
Toshiyuki Ogata;Kazuyuki Uehara;Masao Nakayama;Shinji Tsudou;Takashi Masutani;Takanobu Okayama
在这项研究中，我们的目的是比较平坦无滤光片(FFF)光子束和平坦滤光片(FF)光束电离室中的极性校正因子。测量采用6 mV和10 mV FFF和FF束。评估了五个商用电离室：PTW TN30013；IBA剂量学CC01、CC04和CC13；以及Exradin A12S。除CC01电离室外，其他四个电离室的FFF束和FF束的极性效应相差不到0.3%。与其他腔室不同，CC01腔室显示出强烈的场大小依赖性。具有FFF束的所有腔室的极性效应都不随剂量率而改变。除CC01室外，FFF束和FF束的极性效应差异不显著。
In this study, we aimed to compare the polarity correction factor in ionization chambers for flattening filter free (FFF) photon beams and flattening filter (FF) beams. Measurements were performed with both 6 and 10 MV FFF and FF beams. Five commercial ionization chambers were evaluated: PTW TN30013; IBA Dosimetry CC01, CC04, and CC13; and Exradin A12S. Except for the CC01 ionization chamber, the other four chambers showed less than a 0.3 % difference in the polarity effect between the FFF and the FF beams. The CC01 chamber showed a strong field-size-dependence, unlike the other chambers. The polarity effect for all chambers with FFF beams did not change with the dose rate. Except in the case of the CC01 chamber, the difference in the polarity effect between FFF and FF beams was not significant.