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Determination of total scatter correction factor for non-square fields and fields with wedge

The aim of this study is to determine the total scatter correction factor for open and wedged rectangular fields for 6MV photon beam from Siemens :rvtX£2 linear accelerator. The total scatter factor, Scp consists of two components, the collimator scatter correction factor, Sc and phantom scatter...

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Main Author: Ramly, Siti Aishah
Format: Article
Language:English
Published: Pusat Pengajian Sains Kesihatan, Universiti Sains Malaysia 2004
Subjects:
RM Therapeutics. Pharmacology
Online Access:http://eprints.usm.my/46738/1/PTA...Siti%20Aiyah%20Binti%20Ramly...2004...-24%20pages.pdf
http://eprints.usm.my/46738/
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spelling my.usm.eprints.46738 http://eprints.usm.my/46738/ Determination of total scatter correction factor for non-square fields and fields with wedge Ramly, Siti Aishah RM Therapeutics. Pharmacology The aim of this study is to determine the total scatter correction factor for open and wedged rectangular fields for 6MV photon beam from Siemens :rvtX£2 linear accelerator. The total scatter factor, Scp consists of two components, the collimator scatter correction factor, Sc and phantom scatter correction factor, Sp. This study also determines for wedge factor of square and non-square fields from the same source. For open fields, measurements for Scp and Sc of square and non-square fields were carried out. The charge for each field size is normalized to the charge of 1 Ocm x 1 Ocm field size both obtained from the electrometer at 1 Ocm depth. Sc was measured in mini phantom in air while water phantom was for Scp measurement. The value of Sp is derived from the fonnula, Scp/Sc (1). To obtain the value of Sc, Scp and Sp for square and nonsquare fields of wedged fields, the procedure is the same as for the open fields. Subsequently, the wedge factor is obtained by taking the ratio of the charge when the wedge is inserted to the charge when the wedge is not inserted for each field size. For wedged field only 30 degrees wedge was utilized. The data shows that the total scatter correction factor for non-square fields both for the open and wedged fields are almost the same as the square fields for the field sizes investigated This would mean that Scp, Sc and Sp for non-square fields could be estimated by using the value of their equivalent square. The wedge factor for square fields and non-square fields agreed within 54% and 55%. Adding the wedge into the beam caused the value of total scatter correction factor to decrease by 54% and 55% compare to the open fields. Pusat Pengajian Sains Kesihatan, Universiti Sains Malaysia 2004 Article NonPeerReviewed application/pdf en http://eprints.usm.my/46738/1/PTA...Siti%20Aiyah%20Binti%20Ramly...2004...-24%20pages.pdf Ramly, Siti Aishah (2004) Determination of total scatter correction factor for non-square fields and fields with wedge. The aim of this study is to determine the total scatter correction factor for open and wedged rectangular fields for 6MV photon beam from Siemens :rvtX£2 linear accelerator. The total scatter factor, Scp consists of two components, the collimator scatter. (Submitted)
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic RM Therapeutics. Pharmacology
spellingShingle RM Therapeutics. Pharmacology
Ramly, Siti Aishah
Determination of total scatter correction factor for non-square fields and fields with wedge
description The aim of this study is to determine the total scatter correction factor for open and wedged rectangular fields for 6MV photon beam from Siemens :rvtX£2 linear accelerator. The total scatter factor, Scp consists of two components, the collimator scatter correction factor, Sc and phantom scatter correction factor, Sp. This study also determines for wedge factor of square and non-square fields from the same source. For open fields, measurements for Scp and Sc of square and non-square fields were carried out. The charge for each field size is normalized to the charge of 1 Ocm x 1 Ocm field size both obtained from the electrometer at 1 Ocm depth. Sc was measured in mini phantom in air while water phantom was for Scp measurement. The value of Sp is derived from the fonnula, Scp/Sc (1). To obtain the value of Sc, Scp and Sp for square and nonsquare fields of wedged fields, the procedure is the same as for the open fields. Subsequently, the wedge factor is obtained by taking the ratio of the charge when the wedge is inserted to the charge when the wedge is not inserted for each field size. For wedged field only 30 degrees wedge was utilized. The data shows that the total scatter correction factor for non-square fields both for the open and wedged fields are almost the same as the square fields for the field sizes investigated This would mean that Scp, Sc and Sp for non-square fields could be estimated by using the value of their equivalent square. The wedge factor for square fields and non-square fields agreed within 54% and 55%. Adding the wedge into the beam caused the value of total scatter correction factor to decrease by 54% and 55% compare to the open fields.
format Article
author Ramly, Siti Aishah
author_facet Ramly, Siti Aishah
author_sort Ramly, Siti Aishah
title Determination of total scatter correction factor for non-square fields and fields with wedge
title_short Determination of total scatter correction factor for non-square fields and fields with wedge
title_full Determination of total scatter correction factor for non-square fields and fields with wedge
title_fullStr Determination of total scatter correction factor for non-square fields and fields with wedge
title_full_unstemmed Determination of total scatter correction factor for non-square fields and fields with wedge
title_sort determination of total scatter correction factor for non-square fields and fields with wedge
publisher Pusat Pengajian Sains Kesihatan, Universiti Sains Malaysia
publishDate 2004
url http://eprints.usm.my/46738/1/PTA...Siti%20Aiyah%20Binti%20Ramly...2004...-24%20pages.pdf
http://eprints.usm.my/46738/
_version_ 1672611562188177408
score 13.211869

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