Accuracy of dose calculation algorithms for static and rotational IMRT of lung cancer: A phantom study

Carla Sini, Sara Broggi, Claudio Fiorino, Giovanni Mauro Cattaneo, Riccardo Calandrino

Research output: Contribution to journalArticle

Abstract

Purpose: To evaluate the dosimetric accuracy of Pencil beam (PB), Anisotropic Analytical Algorithm (AAA) and Collapsed Cone Convolution Superposition (CCCS) in thoracic tumours for various IMRT techniques. Methods: Step-and-shoot Linac IMRT (IMRT), arc volumetric RapidArc (RA) and Helical Tomotherapy (HT) lung treatments for different clinical situations (mediastinum tumour, single metastasis and multiple metastases) were simulated and calculated with PB/AAA, AAA, CCCS, respectively. Delivery quality assurance plans were first verified in homogeneous media (Cheese phantom and ArcCHECK); then several low-density inhomogeneous phantoms were used: the Multiplug ArcCHECK, the commercial ArcCHECK slightly modified with a low density lung-shape insert and a custom-made slab heterogeneous phantom simulating the thorax region. Absolute doses and planar dose maps were checked to assess the agreement between measured and calculated dose distributions. Results: In total, data referred to 195 point dose measurements and 189 planar measurements were considered. Average point absolute deviations

Original languageEnglish
Pages (from-to)382-390
Number of pages9
JournalPhysica Medica
Volume31
Issue number4
DOIs
Publication statusPublished - Jun 1 2015

Keywords

  • Dose calculation algorithms
  • IMRT techniques
  • Low density media

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging
  • Physics and Astronomy(all)
  • Medicine(all)

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