Method for selecting minimum width of leaf in multileaf adjustable collimator while inhibiting passage of particle beams of radiation through sawtooth joints between collimator leaves
Abstract
A method is disclosed for selecting the minimum width of individual leaves of a multileaf adjustable collimator having sawtooth top and bottom surfaces between adjacent leaves of a first stack of leaves and sawtooth end edges which are capable of intermeshing with the corresponding sawtooth end edges of leaves in a second stack of leaves of the collimator. The minimum width of individual leaves in the collimator, each having a sawtooth configuration in the surface facing another leaf in the same stack and a sawtooth end edge, is selected to comprise the sum of the penetration depth or range of the particular type of radiation comprising the beam in the particular material used for forming the leaf; plus the total path length across all the air gaps in the area of the joint at the edges between two leaves defined between lines drawn across the peaks of adjacent sawtooth edges; plus at least one half of the length or period of a single sawtooth. To accomplish this, in accordance with the method of the invention, the penetration depth of the particular type of radiation in the particular material to be used for the collimator leaf is first measured. Then themore »
- Inventors:
-
- Berkeley, CA
- Hayward, CA
- Lafayette, CA
- Issue Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- OSTI Identifier:
- 870012
- Patent Number(s):
- 5438454
- Assignee:
- Regents, University of California (Berkeley, CA)
- Patent Classifications (CPCs):
-
A - HUMAN NECESSITIES A61 - MEDICAL OR VETERINARY SCIENCE A61N - ELECTROTHERAPY
G - PHYSICS G21 - NUCLEAR PHYSICS G21K - TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- method; selecting; minimum; width; leaf; multileaf; adjustable; collimator; inhibiting; passage; particle; beams; radiation; sawtooth; joints; leaves; disclosed; individual; top; bottom; surfaces; adjacent; stack; edges; capable; intermeshing; corresponding; configuration; surface; facing; edge; selected; comprise; penetration; depth; range; particular; type; comprising; beam; material; forming; plus; total; path; length; air; gaps; joint; defined; lines; drawn; peaks; half; period; single; accomplish; accordance; measured; distance; gap; adjoining; abutting; ratio; height; sawteeth; finally; pass; determined; formed; measurement; selection; parameters; permit; determine; required; prevent; bottom surfaces; air gap; path length; particle beam; bottom surface; particle beams; radiation comprising; surface facing; particular type; particular material; penetration depth; minimum width; air gaps; /359/250/378/
Citation Formats
Ludewigt, Bernhard, Bercovitz, John, Nyman, Mark, and Chu, William. Method for selecting minimum width of leaf in multileaf adjustable collimator while inhibiting passage of particle beams of radiation through sawtooth joints between collimator leaves. United States: N. p., 1995.
Web.
Ludewigt, Bernhard, Bercovitz, John, Nyman, Mark, & Chu, William. Method for selecting minimum width of leaf in multileaf adjustable collimator while inhibiting passage of particle beams of radiation through sawtooth joints between collimator leaves. United States.
Ludewigt, Bernhard, Bercovitz, John, Nyman, Mark, and Chu, William. Sun .
"Method for selecting minimum width of leaf in multileaf adjustable collimator while inhibiting passage of particle beams of radiation through sawtooth joints between collimator leaves". United States. https://www.osti.gov/servlets/purl/870012.
@article{osti_870012,
title = {Method for selecting minimum width of leaf in multileaf adjustable collimator while inhibiting passage of particle beams of radiation through sawtooth joints between collimator leaves},
author = {Ludewigt, Bernhard and Bercovitz, John and Nyman, Mark and Chu, William},
abstractNote = {A method is disclosed for selecting the minimum width of individual leaves of a multileaf adjustable collimator having sawtooth top and bottom surfaces between adjacent leaves of a first stack of leaves and sawtooth end edges which are capable of intermeshing with the corresponding sawtooth end edges of leaves in a second stack of leaves of the collimator. The minimum width of individual leaves in the collimator, each having a sawtooth configuration in the surface facing another leaf in the same stack and a sawtooth end edge, is selected to comprise the sum of the penetration depth or range of the particular type of radiation comprising the beam in the particular material used for forming the leaf; plus the total path length across all the air gaps in the area of the joint at the edges between two leaves defined between lines drawn across the peaks of adjacent sawtooth edges; plus at least one half of the length or period of a single sawtooth. To accomplish this, in accordance with the method of the invention, the penetration depth of the particular type of radiation in the particular material to be used for the collimator leaf is first measured. Then the distance or gap between adjoining or abutting leaves is selected, and the ratio of this distance to the height of the sawteeth is selected. Finally the number of air gaps through which the radiation will pass between sawteeth is determined by selecting the number of sawteeth to be formed in the joint. The measurement and/or selection of these parameters will permit one to determine the minimum width of the leaf which is required to prevent passage of the beam through the sawtooth joint.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1995},
month = {Sun Jan 01 00:00:00 EST 1995}
}