IMRT sequencing for a six-bank multi-leaf system

In this study, we present a sequencer for delivering step-and-shoot IMRT using a six-bank multi-leaf system. Such a system was proposed earlier and combines a high-resolution field-shaping ability with a large field size. It consists of three layers of two opposing leaf banks with 1 cm leaves. The l...

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Bibliographic Details
Published in:Physics in medicine & biology 2005-05, Vol.50 (9), p.2015-2031
Main Authors: Topolnjak, R, van der Heide, U A, Lagendijk, J J W
Format: Article
Language:English
Subjects:
Algorithms
Computer Simulation
Dose Fractionation
Equipment Failure Analysis - methods
Humans
Models, Biological
Radiometry - methods
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted - methods
Radiotherapy, Conformal - instrumentation
Radiotherapy, Conformal - methods
Relative Biological Effectiveness
Reproducibility of Results
Sensitivity and Specificity
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Summary:In this study, we present a sequencer for delivering step-and-shoot IMRT using a six-bank multi-leaf system. Such a system was proposed earlier and combines a high-resolution field-shaping ability with a large field size. It consists of three layers of two opposing leaf banks with 1 cm leaves. The layers are rotated relative to each other at 60 degrees . A low-resolution mode of sequencing is achieved by using one layer of leaves as primary MLC, while the other two are used to improve back-up collimation. For high-resolution sequencing, an algorithm is presented that creates segments shaped by all six banks. Compared to a hypothetical mini-MLC with 0.4 cm leaves, a similar performance can be achieved, but a trade-off has to be made between accuracy and the number of segments.
ISSN:0031-9155
1361-6560
DOI:10.1088/0031-9155/50/9/007