Dosimetric and qualitative analysis of kinetic properties of millennium 80 multileaf collimator system for dynamic intensity modulated radiotherapy treatments

The aim of this paper is to analyze the positional accuracy, kinetic properties of the dynamic multileaf collimator (MLC) and dosimetric evaluation of fractional dose delivery for the intensity modulated radiotherapy (IMRT) for step and shoot and sliding window (dynamic) techniques of Varian multile...

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Bibliographic Details
Published in:Journal of cancer research and therapeutics 2007-01, Vol.3 (1), p.23-28
Main Author: Bhardwaj AnupK, Kehwar TS, Chakarvarti SK, Oinam AS, Sharma SC
Format: Article
Language:English
Subjects:
Dynamic intensity modulated radiotherapy (IMRT), IMRT protocol, multileaf collimator, quality assurance tests
Equipment Design - standards
Humans
Kinetics
Medical equipment
Optical instruments
Photographic industry
Physiological apparatus
Quality Assurance, Health Care
Radiometry - standards
Radiotherapy
Radiotherapy Planning, Computer-Assisted - standards
Radiotherapy, Intensity-Modulated - standards
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Summary:The aim of this paper is to analyze the positional accuracy, kinetic properties of the dynamic multileaf collimator (MLC) and dosimetric evaluation of fractional dose delivery for the intensity modulated radiotherapy (IMRT) for step and shoot and sliding window (dynamic) techniques of Varian multileaf collimator millennium 80. Various quality assurance tests such as accuracy in leaf positioning and speed, stability of dynamic MLC output, inter and intra leaf transmission, dosimetric leaf separation and multiple carriage field verification were performed. Evaluation of standard field patterns as pyramid, peaks, wedge, chair, garden fence test, picket fence test and sweeping gap output was done. Patient dose quality assurance procedure consists of an absolute dose measurement for all fields at 5 cm depth on solid water phantom using 0.6cc water proof ion chamber and relative dose verification using Kodak EDR-2 films for all treatment fields along transverse and coronal direction using IMRT phantom. The relative dose verification was performed using Omni Pro IMRT film verification software. The tests performed showed acceptable results for commissioning the millennium 80 MLC and Clinac DHX for dynamic and step and shoot IMRT treatments.
ISSN:0973-1482
1998-4138
DOI:10.4103/0973-1482.31967