Comparison Between Physical Wedges And Virtual Wedges In Linac
| dc.contributor.author | ZI XIANG, TAN | |
| dc.date.accessioned | 2016-05-11T02:39:13Z | |
| dc.date.available | 2016-05-11T02:39:13Z | |
| dc.date.issued | 2015-02 | |
| dc.description.abstract | Wedge is commonly used in radiotherapy to modify isodose distribution and reduce intensity across the radiation field. There are two types of wedge for SIEMENS linear accelerator, physical wedge and virtual wedge. Virtual wedge replaces the procedure to mount on the physical wedge when a wedged isodose is needed. The aim of this study is to facilitate the clinical application of the virtual wedge in the radiotherapy. Comparison for beam profiles and percentage depth dose of both wedges at four angles of 15°, 30°, 45° and 60° are done. Beam profiles of field size 10 x 10 cm2 and 20 x 20 cm2 for both type of wedges is measured at 5.0 cm depth. Percentage depth dose of both wedges for field size 10 x 10 cm2 is measured. For beam profile comparison, the virtual wedge has similar profile gradient with the physical wedge. For field size 10 x 10 cm2, the physical wedge exhibits lower dose than the virtual wedge by 3.6%, 1.6%, 2.0% and 4.7% for angle 15°, 30°, 45° and 60° at 5.0 cm thin end of the wedge. Away from field size 10 x 10 cm2, at 7.4 cm thin end of the wedge, the physical wedge shows higher dose by 7.6%, 15.8%, 26.1% and 25.5% for angle 15°, 30°, 45° and 60°. Whereas for field size 20 x 20 cm2, the physical wedge shows lower dose by 3.3%, 1.1%, 2.2% and 3.9% for angle 15°, 30°, 45° and 60° at 5.0 cm thin end of the wedge. For depth dose profile comparison, the physical wedge is showing lower dose by 0.5%, 0.9%, 2.0% and 1.8% in angle 15°, 30°, 45° and 60° at 1.0 cm depth but higher dose by 1.3%, 1.6%, 2.5% and 2.2% in angle 15°, 30°, 45° and 60° at 10.0 cm depth. In conclusion, the virtual wedge profiles are almost similar with the physical wedge but less hardening effect and less scatter dose outside of radiation field. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/2014 | |
| dc.subject | Comparison Between Physical Wedges | en_US |
| dc.subject | And Virtual Wedges In Linac | en_US |
| dc.title | Comparison Between Physical Wedges And Virtual Wedges In Linac | en_US |
| dc.type | Thesis | en_US |
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