Evaluation of a commercial three-dimensional electron beam treatment planning system

We evaluated a commercial three-dimensional (3D) electron beam treatment planning system (CADPLAN V.2.7.9) using both experimentally measured and Monte Carlo calculated dose distributions to compare with those predicted by CADPLAN calculations. Tests were carried out at various field sizes and elect...

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Bibliographic Details
Published in:Medical physics (Lancaster) 1999-12, Vol.26 (12), p.2571-2580
Main Authors: Ding, G. X., Cygler, J. E., Zhang, G. G., Yu, M. K.
Format: Article
Language:English
Subjects:
Algorithms
Dose-Response Relationship, Radiation
dosimetry
Dosimetry/exposure assessment
electron beam
electron beam applications
Electron beams
Electrons
Evaluation Studies as Topic
Field size
Humans
inhomogeneous phantom
Medical treatment planning
Monte Carlo Method
Monte Carlo methods
Phantoms, Imaging
Physicists
radiation therapy
Radiotherapy, Computer-Assisted
Ribs - radiation effects
Software
Spine - radiation effects
Trachea - radiation effects
treatment planning
Treatment strategy
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Summary:We evaluated a commercial three-dimensional (3D) electron beam treatment planning system (CADPLAN V.2.7.9) using both experimentally measured and Monte Carlo calculated dose distributions to compare with those predicted by CADPLAN calculations. Tests were carried out at various field sizes and electron beam energies from 6 to 20 MeV. For a homogeneous water phantom the agreement between measured and CADPLAN calculated dose distributions is very good except at the phantom surface. CADPLAN is able to predict hot and cold spots caused by a simple 3D inhomogeneity but unable to predict dose distributions for a more complex geometry where CADPLAN underestimates dose changes caused by inhomogeneity. We discussed possible causes for the inaccuracy in the CADPLAN dose calculations. In addition, we have tested CADPLAN treatment monitor unit and electron cut-out factor calculations and found that CADPLAN predictions generally agree with manual calculations.
ISSN:0094-2405
2473-4209
DOI:10.1118/1.598795