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.
|Title of host publication||8th International Conference on 3D Radiation Dosimetry (IC3DDOSE)|
|Publication status||Published - 2015|
|Event||8th International Conference on 3D Radiation Dosimetry (IC3DDose) - Ystad, SWEDEN|
Duration: 2014 Sep 4 → 2014 Sep 7
|Conference||8th International Conference on 3D Radiation Dosimetry (IC3DDose)|
|Period||2014/09/04 → 2014/09/07|