Optimization of relative weights and wedge angles in treatment planning

An efficient technique to optimize beam weights and wedge angles in radiotherapy treatment planning has been developed. Based on the fact that a wedged field can be regarded as a superposition of an open field and a nominal wedged field, this approach reduces the problem of finding J beam weights an...

Full description

Saved in:
Bibliographic Details
Published in:Medical physics (Lancaster) 1997-02, Vol.24 (2), p.215-221
Main Authors: Xing, Lei, Pelizzari, C., Kuchnir, F. T., Chen, G. T. Y.
Format: Article
Language:English
Subjects:
87.53.10
87.53.10.g
Algorithms
Biophysical Phenomena
Biophysics
dosimetry
Dosimetry/exposure assessment
iterative methods
Medical image reconstruction
Medical treatment planning
optimisation
Optimization
Physicists
radiation therapy
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted - methods
Technology, Radiologic
Treatment strategy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An efficient technique to optimize beam weights and wedge angles in radiotherapy treatment planning has been developed. Based on the fact that a wedged field can be regarded as a superposition of an open field and a nominal wedged field, this approach reduces the problem of finding J beam weights and the corresponding wedge angles to optimizing a linear system with 2J unknowns (weights of J open beams and J nominal wedged beams), where J is the total number of incident beam directions. Two iterative algorithms similar to the iterative-least-square technique in image reconstruction are used to optimize the system. Application of the algorithms to two specific examples shows that this technique can reduce treatment planning time and effort, and promises to create a better solution for an arbitrarily complex treatment plan.
ISSN:0094-2405
2473-4209
DOI:10.1118/1.598067