The influence of using simplified model for beamlet dose calculations in IMRT treatment planning and the approaches to diminish the influence / 生物医学工程学杂志
Journal of Biomedical Engineering
; (6): 270-274, 2008.
Article
de Zh
| WPRIM
| ID: wpr-291251
Bibliothèque responsable:
WPRO
ABSTRACT
Simplified dose calculation model with high computation efficiency is often used to generate the dose matrices for beamlets in the inverse planning of the intensity modulate radiation therapy. It is likely that this simplification could degrade the quality of the final treatment plans. This paper is aimed at testing the influence of such simplification in dose calculations of beamlets and accordingly proposing methods to avoid severe degradation of the plans. Two simulation instances were adopted. The primary dose calculation model without involvment of scattering effect was used to generate the dose matrices of beamlets. The differential convolution superposition dose calculation model that well accounts for scattering effect was used to calculate the final dose distributions for given intensity profiles. It is found that the simplification in dose matrices of beamlets degrades the dose levels in the edge area of the targets, however, the degradation could be diminished or even avoided by adding a suitable margin around the targets or by using the multiple-shifted-beamlet-matrices (MSBM) method that was proposed in our previous paper.
Texte intégral:
1
Indice:
WPRIM
Sujet Principal:
Radiométrie
/
Dosimétrie en radiothérapie
/
Diffusion de rayonnements
/
Planification de radiothérapie assistée par ordinateur
/
Radiothérapie conformationnelle
/
Méthodes
Limites du sujet:
Humans
langue:
Zh
Texte intégral:
Journal of Biomedical Engineering
Année:
2008
Type:
Article