Verification of motion induced thread effect during tomotherapy using gel dosimetry

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


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.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Radiology, Nuclear Medicine and Medical Imaging
Original languageEnglish
Title of host publication8th International Conference on 3D Radiation Dosimetry (IC3DDOSE)
PublisherIOP Publishing
Publication statusPublished - 2015
Publication categoryResearch
Event8th International Conference on 3D Radiation Dosimetry (IC3DDose) - Ystad, SWEDEN
Duration: 2014 Sep 42014 Sep 7

Publication series

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


Conference8th International Conference on 3D Radiation Dosimetry (IC3DDose)