PMID: 16506620Mar 2, 2006Paper

Verification dosimetry during treatment for helical tomotherapy using radiographic film

Australasian Physical & Engineering Sciences in Medicine
Tomas KronT R Mackie

Abstract

Helical tomotherapy (HT) is a novel radiotherapy treatment modality that allows the delivery of intensity modulated radiation in a rotational fashion. Due to the complexity of the treatment approach, it is desirable to have a simple tool for treatment delivery verification. Radiographic film placed under the patient is exposed to dose from most of the possible beam projections and therefore constitutes a useful in vivo dosimetry record of the whole treatment. Measurements were performed during the initial clinical implementation of HT at the London Regional Cancer Centre on all patients during the first treatment fraction. It was possible to predict the optical density of the film using a dose calculation on a phantom of similar size to the patient. The comparison of expected and delivered dose allows the verification of dose delivery patterns which was found to be particularly useful in the case of treatment interruptions. The absolute dose measured with film differed in general by less than 10% from the expected one despite the fact that no build-up was used on the film. The agreement improved with proximity of the primary target to the location of the film on the treatment couch. Due to the rotational delivery mode, radiogra...Continue Reading

References

Jun 3, 1998·Medical Physics·D A LowJ A Purdy
Mar 10, 1999·Physics in Medicine and Biology·E E FitchardT R Mackie
Apr 10, 1999·Seminars in Radiation Oncology·T R MackieM Mehta
Jul 1, 1999·International Journal of Radiation Oncology, Biology, Physics·T CraigJ Van Dyk
Jan 24, 2003·Journal of Applied Clinical Medical Physics·Nzhde AgazaryanJohn J DeMarco
Jul 30, 2003·Physics in Medicine and Biology·G GrigorovG Rodrigues
Sep 28, 2004·Physics in Medicine and Biology·Tomas KronJake Van Dyk
Jun 30, 2005·Medical Physics·M W KissickE T Soisson

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Citations

Jan 1, 2007·Biomedical Imaging and Intervention Journal·S YartsevJ Van Dyk

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