Go to  Advanced Search

Dose verification of a stereotactic IMRT treatment planning system

Show full item record

Files in this item

Files Size Format Description   View
ubc_2010_spring_xian_zheng.pdf 6.100Mb Adobe Portable Document Format   View/Open
 
Title: Dose verification of a stereotactic IMRT treatment planning system
Author: Xian, Zheng
Degree Master of Science - MSc
Program Physics
Copyright Date: 2010
Publicly Available in cIRcle 2010-04-19
Abstract: In this project, ion chamber measurement and film dosimetry were used to verify dose distributions for a new stereotactic IMRT (Intensity Modulated Radiation Therapy) treatment planning system. This technique combines the principles of stereotactic radiosurgery and IMRT to significantly increase the positioning accuracy compared with conventional IMRT . Ion chamber measurements reveal that the discrepancy between the measured and the calculated dose at the isocenter can be up to 2%. Angular dependence of ion chamber sensitivity and the tissue equivalence of the phantom material were determined to be the main sources of this discrepancy. Radiochromic film was used as the film dosimeter in the project. A set of performance tests of Gafchromic EBT film indicated that the uncertainty in Gafchromic EBT film dosimety was expected to be 2.5%. However, the discrepancies we found in measurements of clinical cases using the film were much larger than this. And further investigation into this discrepancy was beyond the scope of this thesis.
URI: http://hdl.handle.net/2429/23810
Scholarly Level: Graduate

This item appears in the following Collection(s)

Show full item record

All items in cIRcle are protected by copyright, with all rights reserved.

UBC Library
1961 East Mall
Vancouver, B.C.
Canada V6T 1Z1
Tel: 604-822-6375
Fax: 604-822-3893