PMID: 16623218Apr 21, 2006Paper

The prediction of transmitted dose distributions using a 3D treatment planning system

Australasian Physical & Engineering Sciences in Medicine
Paul ReichL Fog

Abstract

Patient dose verification is becoming increasingly important with the advent of new complex radiotherapy techniques such as conformal radiotherapy (CRT) and intensity-modulated radiotherapy (IMRT). An electronic portal imaging device (EPID) has potential application for in vivo dosimetry. In the current work, an EPID has been modelled using a treatment planning system (TPS) to predict transmitted dose maps. A thin slab of RW3 material used to initially represent the EPID. A homogeneous RW3 phantom and the thin RW3 slab placed at a clinical distance away from the phantom were scanned using a CT simulator. The resulting CT images were transferred via DICOM to the TPS and the density of the CT data corresponding to the thin RW3 slab was changed to 1 g/cm3. Transmitted dose maps (TDMs) in the modelled EPID were calculated by the TPS using the collapsed-cone (C-C) convolution superposition (C/S) algorithm. A 6 MV beam was used in the simulation to deliver 300 MU to the homogenous phantom using an isocentric and SSD (source-to-surface) technique. The phantom thickness was varied and the calculated TDMs in the modelled EPID were compared with corresponding measurements obtained from a calibrated scanning liquid-filled ionisation chamb...Continue Reading

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Citations

May 19, 2007·Australasian Physical & Engineering Sciences in Medicine·L D Oliver
Jan 8, 2013·Journal of Medical Physics·Mohammad MohammadiThomas P Rutten
Aug 19, 2008·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Wouter van ElmptBen Mijnheer
Jun 28, 2008·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Mohammad MohammadiPaul Reich
Jan 10, 2018·Medical Physics·S DeshpandeP Vial
Jul 19, 2006·Australasian Physical & Engineering Sciences in Medicine·M MohammadiP Reich

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