Verification of motion induced thread effect during tomotherapy using gel dosimetry

Anneli Edvardsson, Anna Ljusberg, Crister Ceberg, Joakim Medin, Lee Ambolt, Fredrik Nordström, Sofie Ceberg

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

Abstract

The purpose of the study was to evaluate how breathing motion during tomotherapy (Accuray, CA, USA) treatment affects the absorbed dose distribution. The experiments were carried out using gel dosimetry and a motion device simulating respiratory-like motion (HexaMotion, ScandiDos, Uppsala, Sweden). Normoxic polyacrylamide gels (nPAG) were irradiated, both during respiratory-like motion and in a static mode. To be able to investigate interplay effects the static absorbed dose distribution was convolved with the motion function and differences between the dynamic and convolved static absorbed dose distributions were interpreted as interplay effects. The expected dose blurring was present and the interplay effects formed a spiral pattern in the lower dose volume. This was expected since the motion induced affects the preset pitch and the theoretically predicted thread effect may emerge. In this study, the motion induced thread effect was experimentally verified for the first time.
Original languageEnglish
Title of host publication8th International Conference on 3D Radiation Dosimetry (IC3DDOSE)
PublisherIOP Publishing
Pages012048
Volume573
DOIs
Publication statusPublished - 2015
Event8th International Conference on 3D Radiation Dosimetry (IC3DDose) - Ystad, SWEDEN
Duration: 2014 Sept 42014 Sept 7

Publication series

Name
Volume573
ISSN (Print)1742-6596
ISSN (Electronic)1742-6588

Conference

Conference8th International Conference on 3D Radiation Dosimetry (IC3DDose)
Period2014/09/042014/09/07

Subject classification (UKÄ)

  • Radiology, Nuclear Medicine and Medical Imaging

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