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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
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[Examination of dose verification in intensity modulated radiation therapy (IMRT) treatment planning using averaging

Ryu Kawamorita1, Keisuke Iwai, Yasushi Takeuchi

  • 1Department of Radiology, Tenri Yorozu Soudansho Hospital, Japan.

Nihon Hoshasen Gijutsu Gakkai Zasshi
|January 9, 2003
PubMed

Since the year 2000, our hospital has been equipped with an intensity modulated radiation therapy (IMRT) facility. Before IMRT is administered, the absorbed dose is measured by the ionization chamber to provide verification for the IMRT procedure. In utilizing the current point dose evaluation, large discrepancies have been experienced when the measured dose is compared with the calculated dose. This discrepancy is due to the lack of uniformity in IMRT irradiation in comparison with that of the present method of dose distribution. In order to reduce the margin of error, the average dose of the ionization chamber calculated on a dose-volume histogram was compared with the measured dose. As a result, the margin of error was minimized to <2% in uniform areas and <4% in non-uniform areas.

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