Beam characteristics of a retrofitted double-focused multileaf collimator

Multileaf collimators (MLCs) are generally believed to be convenient and cost-effective tools for intensity modulation and conformal therapy. They are becoming a standard feature on new accelerators; however, the older units can be retrofitted with modern MLCs. Before such a unit can be clinically u...

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Bibliographic Details
Published in:Medical physics (Lancaster) 1998-09, Vol.25 (9), p.1676-1684
Main Authors: Das, Indra J., Desobry, Gregory E., McNeeley, Shawn W., Cheng, Elizabeth C., Schultheiss, Timothy E.
Format: Article
Language:English
Subjects:
87.53.10.d
Accelerators
Ancillary equipment
beam characteristics
Biophysical Phenomena
Biophysics
Collimators
dosimetry
Dosimetry/exposure assessment
double‐focused leaves
Evaluation Studies as Topic
Humans
linear accelerators
multileaf collimator
Multileaf collimators
Particle Accelerators - instrumentation
Particle Accelerators - statistics & numerical data
Physicists
radiation therapy
Radiometry
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted
Radiotherapy, High-Energy
Scattering, Radiation
Surface measurements
Surface scattering
Technology, Radiologic
Transmission measurement
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Summary:Multileaf collimators (MLCs) are generally believed to be convenient and cost-effective tools for intensity modulation and conformal therapy. They are becoming a standard feature on new accelerators; however, the older units can be retrofitted with modern MLCs. Before such a unit can be clinically used, the beam characteristics must be verified. In this study the beam characteristics of a Siemens double-focused MLC retrofitted to an MD2 linear accelerator are presented. The head leakage along with inter- and intra-leaf radiation transmission were measured using film. The collimator (S c ), phantom (S p ), total (S cp ) scatter factors, central axis depth dose, beam profiles for off-axis ratios, penumbra, and surface dose were evaluated for square, rectangular, and irregularly shaped fields. The maximum head leakage was estimated to be
ISSN:0094-2405
2473-4209
DOI:10.1118/1.598348