Impact of radiation attenuation by a carbon fiber couch on patient dose verification

Chun Yen Yu, Wen Tsae Chou, Yi Jen Liao, Jeng Hung Lee, Ji An Liang, Shih Ming Hsu

研究成果: 雜誌貢獻文章同行評審

8 引文 斯高帕斯(Scopus)


The aim of this study was to understand the difference between the measured and calculated irradiation attenuations obtained using two algorithms and to identify the influence of couch attenuation on patient dose verification. We performed eight tests of couch attenuation with two photon energies, two longitudinal couch positions, and two rail positions. The couch attenuation was determined using a radiation treatment planning system. The measured and calculated attenuations were compared. We also performed 12 verifications of head-and-neck and rectum cases by using a Delta phantom. The dose deviation (DD), distance to agreement (DTA), and gamma index of pencil-beam convolution (PBC) verifications were nearly the same. The agreement was least consistent for the anisotropic analytical algorithm (AAA) without the couch for the head-and-neck case, in which the DD, DTA, and gamma index were 74.4%, 99.3%, and 89%, respectively; for the rectum case, the corresponding values were 56.2%, 95.1%, and 92.4%. We suggest that dose verification should be performed using the following three metrics simultaneously: DD, DTA, and the gamma index.
期刊Scientific Reports
出版狀態已發佈 - 2月 27 2017

ASJC Scopus subject areas

  • 多學科


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