Journal article
Dosimetric characteristics of a double-focused miniature multileaf collimator
Medical physics (Lancaster), Vol.26(5), pp.729-733
05/1999
DOI: 10.1118/1.598579
PMID: 10360533
Abstract
The dosimetric characteristics of a double-focused miniature multileaf collimator (mMLC) attached to a Philips SL75/5 linear accelerator (linac) have been investigated. Output factors, percentage depth–dose, penumbra, leaf transmission, and leakage between the leaves were measured for the 6 MV x-ray beam on this accelerator. Because leakage both through and between the leaves is minimal, the linac jaws can be kept fixed while the mMLC leaf configuration is modified for different aperture shapes. This allows for accurate output prediction using the equivalent square formalism. Percent depth–dose measured for fields defined by the mMLC show little deviation from the percent depth–dose measured for fields defined by the machine jaws or Lipowitz metal blocks. Because the mMLC matches beam divergence in both directions, allows minimal beam transmission, and has a large source-to-collimator distance, the penumbra is sharper for fields defined by the mMLC than for fields defined by the linac jaws or Lipowitz metal blocks. Based on these data, dose calculations for mMLC-defined fields can be applied with no change in procedures from those used for fields defined using conventional methods.
Details
- Title: Subtitle
- Dosimetric characteristics of a double-focused miniature multileaf collimator
- Creators
- Sanford L Meeks - Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, Florida 32610-0385Francis J Bova - Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, Florida 32610-0385Siyong Kim - Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, Florida 32610-0385Wolfgang A Tomé - Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, Florida 32610-0385John M Buatti - Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, Florida 32610-0385William A Friedman - Department of Neurosurgery, University of Florida College of Medicine, Gainesville, Florida 32610-0385
- Resource Type
- Journal article
- Publication Details
- Medical physics (Lancaster), Vol.26(5), pp.729-733
- DOI
- 10.1118/1.598579
- PMID
- 10360533
- ISSN
- 0094-2405
- eISSN
- 2473-4209
- Number of pages
- 5
- Language
- English
- Date published
- 05/1999
- Academic Unit
- Radiation Oncology; Neurosurgery; Otolaryngology
- Record Identifier
- 9984040598902771
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