Optimizing the effective spot size and the dosimetric leaf gap of the AcurosXB algorithm for VMAT treatment planning.

ABSTRACT:

Purpose

The aim of this study is to provide and test a new methodology to adjust the AcurosXB beam model for VMAT treatment plans.

Method

The effective target spot size of the AcurosXB v15 algorithm was adjusted in order to minimize the difference between calculated and measured penumbras. The dosimetric leaf gap (DLG) was adjusted using the asynchronous oscillating sweeping gap tests defined in the literature and the MLC transmission was measured. The impact of the four parameters on the small field output factors was assessed using a design of experiment methodology. Patient quality controls were performed for the three beam models investigated including two energies and two MLC models.

Results

Effective target spot sizes differed from the manufacturer recommendatio

SUBMITTER: Passal V 

PROVIDER: S-EPMC8200512 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature