Determination of composite field correction factor kpcsr,msr for Tomotherapy

A. Fitriandini, W. E. Wibowo, S. A. Pawiro

Research output: Contribution to journalConference articlepeer-review


The purpose of this study is to determine the correction factor of the composite field (kpcsr,msr ) of Tomotherapy for head and neck cases and to investigate the influence parameters of the pcsr field. This study employed Exradin A1SL and A 16 as the investigated chambers, and EBT3 as the reference dosimeter. The pcsr fields were created based on cylindrical water solid phantom. The results of this study show that the kpcsr,msr values for both detectors increased with increasing field width (jaw), decreasing complexity level, and increasing pitch value. The yielded results indicate several factors affecting the kpcsr,msr values: target homogeneity, volume averaging effect, thread effect, and the difference of general recombination at the different field width. These results represent that kpcsr,msr is specific and depends on the parameters of the composite field. The kpcsr,msr values for head and neck cases vary from 0.978-1.028. This variation implies that the determination of pcsr field should be according to the parameters used in clinical conditions. Due to the different position of the chamber and the film, the target should have excellent dose homogeneity to avoid the different response of the detectors.

Original languageEnglish
Article number012058
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 6 Jun 2019
Event18th Asia-Oceania Congress of Medical Physics, AOCMP 2018 and 16th South-East Asia Congress of Medical Physics, SEACOMP 2018 - Bangsar South, Kuala Lumpur, Malaysia
Duration: 11 Nov 201814 Nov 2018

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