Journal article
A method to select aperture margin in collimated spot scanning proton therapy
Physics in medicine & biology, Vol.60(7), pp.N109-N119
03/17/2015
DOI: 10.1088/0031-9155/60/7/N109
PMID: 25776926
Abstract
The use of collimator or aperture may sharpen the lateral dose gradient for spot scanning proton therapy. However, to date, there has not been a standard method to determine the aperture margin for a single field in collimated spot scanning proton therapy. This study describes a theoretical framework to select the optimal aperture margin for a single field, and also presents the spot spacing limit required such that the optimal aperture margin exists. Since, for a proton pencil beam partially intercepted by collimator, the maximum point dose (spot center) shifts away from the original pencil beam central axis, we propose that the optimal margin should be equal to the maximum pencil beam center shift under the condition that spot spacing is small with respect to the maximum pencil beam center shift, which can be numerically determined based on beam modeling data. A test case is presented which demonstrates agreement with the prediction made based on the proposed methods. When apertures are applied in a commercial treatment planning system this method may be implemented.
Details
- Title: Subtitle
- A method to select aperture margin in collimated spot scanning proton therapy
- Creators
- Dongxu Wang - University of Iowa Department of Radiation Oncology, 200 Hawkins Drive, Iowa City, IA 52242, USABlake R Smith - University of Iowa Department of Radiation Oncology, 200 Hawkins Drive, Iowa City, IA 52242, USAEdgar Gelover - University of Iowa Department of Radiation Oncology, 200 Hawkins Drive, Iowa City, IA 52242, USARyan T Flynn - University of Iowa Department of Radiation Oncology, 200 Hawkins Drive, Iowa City, IA 52242, USADaniel E Hyer - University of Iowa Department of Radiation Oncology, 200 Hawkins Drive, Iowa City, IA 52242, USA
- Resource Type
- Journal article
- Publication Details
- Physics in medicine & biology, Vol.60(7), pp.N109-N119
- Publisher
- IOP Publishing
- DOI
- 10.1088/0031-9155/60/7/N109
- PMID
- 25776926
- ISSN
- 0031-9155
- eISSN
- 1361-6560
- Number of pages
- 11
- Language
- English
- Date published
- 03/17/2015
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiation Oncology
- Record Identifier
- 9984046924802771
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