Dosimetric accuracy of tomotherapy dose calculation in thorax lesions

Veronica Ardu, Sara Broggi, Giovanni M. Cattaneo, Paola Mangili, Riccardo Calandrino

Research output: Contribution to journalArticlepeer-review

Abstract

Background: To analyse limits and capabilities in dose calculation of collapsed-cone-convolution (CCC) algorithm implemented in helical tomotherapy (HT) treatment planning system for thorax lesions.Methods: The agreement between measured and calculated dose was verified both in homogeneous (Cheese Phantom) and in a custom-made inhomogeneous phantom. The inhomogeneous phantom was employed to mimic a patient's thorax region with lung density encountered in extreme cases and acrylic inserts of various dimensions and positions inside the lung cavity. For both phantoms, different lung treatment plans (single or multiple metastases and targets in the mediastinum) using HT technique were simulated and verified. Point and planar dose measurements, both with radiographic extended-dose-range (EDR2) and radiochromic external-beam-therapy (EBT2) films, were performed. Absolute point dose measurements, dose profile comparisons and quantitative analysis of gamma function distributions were analyzed.Results: An excellent agreement between measured and calculated dose distributions was found in homogeneous media, both for point and planar dose measurements. Absolute dose deviations

Original languageEnglish
Article number14
JournalRadiation Oncology
Volume6
Issue number1
DOIs
Publication statusPublished - Feb 9 2011

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging

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