Realisation of radiographic film for IMRT QA at the Nepean Cancer Care centre

Gehrke, C 2010, Realisation of radiographic film for IMRT QA at the Nepean Cancer Care centre, Masters by Research, Applied Sciences, RMIT University.


Document type: Thesis
Collection: Theses

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Title Realisation of radiographic film for IMRT QA at the Nepean Cancer Care centre
Author(s) Gehrke, C
Year 2010
Abstract The feasibility of using Kodak X-Omat V radiographic film as an absolute dosimeter for intensity modulated radiotherapy (IMRT) quality assurance (QA) at the Nepean Cancer Care centre was assessed. Several aspects of film dosimetry were addressed: film digitising, film processing and inherent film characteristics. The study included: the reproducibility, uniformity and geometric accuracy of a transmission film digitiser. The constancy for an automated film processor over a range of doses applicable to a single fraction IMRT step and shoot field, and film dose rate and fraction dependence. Equipment included: an AFGA Curix HT-330 processor, DoseLab for QA plan comparison, ePin, ISP EBT Gafchromic film, ImageJ, Kodak X-Omat V Ready Pack radiographic film, NE 2571 and 2581 ion chambers, Philips Pinnacle planning system, RW3 phantoms, Varian 21EX and 2100CD linear accelerators, Victoreen 07-424 and 07-443 single point densitometers, and a Vidar VXR-16 DosimetryPRO digitiser.

Film processing resulted in an 11% error over a period of several months. For film digitising, a 5% optical density variation was measured between central and peripheral parts of the digitiser however this was corrected using DoseLab. Constancy of the light output was greater than 99% and magnification errors were less than 1 mm. Minimal dose rate and fraction dependence were observed for the film and minimal variations (<0.2%) between film manufacture batches were recorded.
Degree Masters by Research
Institution RMIT University
School, Department or Centre Applied Sciences
Keyword(s) radiographic
film dosimetry
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Created: Mon, 29 Nov 2010, 09:20:20 EST
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