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Characterization of Gafchromic HD-V2...

Azman, Muhammad Taufiq.

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Characterization of Gafchromic HD-V2 Film for Dose Verification in Stereotactic Radiosurgery (SRS).

Record Type:	Electronic resources : Monograph/item
Title/Author:	Characterization of Gafchromic HD-V2 Film for Dose Verification in Stereotactic Radiosurgery (SRS)./
Author:	Azman, Muhammad Taufiq.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	67 p.
Notes:	Source: Masters Abstracts International, Volume: 85-04.
Contained By:	Masters Abstracts International85-04.
Subject:	Silicon. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30599423
ISBN:	9798380458320

Characterization of Gafchromic HD-V2 Film for Dose Verification in Stereotactic Radiosurgery (SRS).
Azman, Muhammad Taufiq.

Characterization of Gafchromic HD-V2 Film for Dose Verification in Stereotactic Radiosurgery (SRS). - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 67 p.

Source: Masters Abstracts International, Volume: 85-04.

Thesis (M.S.)--University of Malaya (Malaysia), 2018.

The purpose of this study was to characterize specific dosimetric properties of Gafchromic HD-V2 film and to investigate its feasibility in the dosimetric verification for Stereotactic Radiosurgery (SRS). Basic dosimeter properties including energy and dose rate dependencies were investigated and HD-V2 film showed energy and dose rate dependencies of less than 9.5% and 4.94% respectively. The HD-V2 film has very low dependency on scanning orientation in portrait versus landscape as well as "face-up" versus "face-down" scanning orientation. The percentage differences recorded were less than 2.7% for portrait versus landscape and less than 2.5% for "face-up" versus "facedown" orientation. In terms of angular dependency, there was no significant influence on net optical density, with deviations less than 4.3% for films irradiated at selected gantry angles ranging from 0° (which film is perpendicular to the irradiation beam) to 180°. Two treatment plans using SRS technique were created and irradiated using HD-V2 film for dosimetric verification. The dose distributions were calculated using a treatment planning system to obtain point doses at specified positions within a phantom. The calculated doses from TPS were compared to dose distributions delivered to HD-V2 film. The results of the point dose measurements for SRS treatment irradiations showed that the deviations between the TPS predicted dose and HD-V2 film measurements were less 4% which were within the recommended values by ICRU. This study shows that Gafchromic HD-V2 film can be used as dosimetric verification for SRS and for radiotherapy clinical practices that involves high range of doses of 10 to 1000 Gy.

ISBN: 9798380458320Subjects--Topical Terms:

669429
Silicon.

Characterization of Gafchromic HD-V2 Film for Dose Verification in Stereotactic Radiosurgery (SRS).
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520 $a The purpose of this study was to characterize specific dosimetric properties of Gafchromic HD-V2 film and to investigate its feasibility in the dosimetric verification for Stereotactic Radiosurgery (SRS). Basic dosimeter properties including energy and dose rate dependencies were investigated and HD-V2 film showed energy and dose rate dependencies of less than 9.5% and 4.94% respectively. The HD-V2 film has very low dependency on scanning orientation in portrait versus landscape as well as "face-up" versus "face-down" scanning orientation. The percentage differences recorded were less than 2.7% for portrait versus landscape and less than 2.5% for "face-up" versus "facedown" orientation. In terms of angular dependency, there was no significant influence on net optical density, with deviations less than 4.3% for films irradiated at selected gantry angles ranging from 0° (which film is perpendicular to the irradiation beam) to 180°. Two treatment plans using SRS technique were created and irradiated using HD-V2 film for dosimetric verification. The dose distributions were calculated using a treatment planning system to obtain point doses at specified positions within a phantom. The calculated doses from TPS were compared to dose distributions delivered to HD-V2 film. The results of the point dose measurements for SRS treatment irradiations showed that the deviations between the TPS predicted dose and HD-V2 film measurements were less 4% which were within the recommended values by ICRU. This study shows that Gafchromic HD-V2 film can be used as dosimetric verification for SRS and for radiotherapy clinical practices that involves high range of doses of 10 to 1000 Gy.
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