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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number43336
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - Feb 27 2017

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couches
carbon fibers
attenuation
dosage
radiation
rectum
deviation
pencil beams
rails
convolution integrals
planning
irradiation
photons

ASJC Scopus subject areas

  • General

Cite this

Impact of radiation attenuation by a carbon fiber couch on patient dose verification. / Yu, Chun Yen; Chou, Wen Tsae; Liao, Yi Jen; Lee, Jeng Hung; Liang, Ji An; Hsu, Shih Ming.

In: Scientific Reports, Vol. 7, 43336, 27.02.2017.

Research output: Contribution to journalArticle

Yu, Chun Yen ; Chou, Wen Tsae ; Liao, Yi Jen ; Lee, Jeng Hung ; Liang, Ji An ; Hsu, Shih Ming. / Impact of radiation attenuation by a carbon fiber couch on patient dose verification. In: Scientific Reports. 2017 ; Vol. 7.
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