Verification of motion induced thread effect during tomotherapy using gel dosimetry

Summary, in English

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.

• Författare: Anneli Edvardsson; Anna Ljusberg; Crister Ceberg; Joakim Medin; Lee Ambolt; Fredrik Nordström; Sofie Ceberg
• Avdelning/ar: Medicinsk strålningsfysik, Lund; Radiotherapy Physics; Medicinsk strålningsfysik, Malmö
• Publiceringsår: 2015
• Språk: Engelska
• Sidor: 012048-012048
• Publikation/Tidskrift/Serie: 8th International Conference on 3D Radiation Dosimetry (IC3DDOSE)
• Volym: 573
• Länkar: http://dx.doi.org/10.1088/1742-6596/573/1/012048
• Dokumenttyp: Konferensbidrag
• Förlag: IOP Publishing
• Ämne: Radiology, Nuclear Medicine and Medical Imaging
• Conference name: 8th International Conference on 3D Radiation Dosimetry (IC3DDose)
• Conference date: 2014-09-04 - 2014-09-07
• Status: Published
• Forskningsgrupp: Radiotherapy Physics; Medical Radiation Physics, Malmö
• ISBN/ISSN/Övrigt: ISSN: 1742-6588; ISSN: 1742-6596