A simulation-based method for evaluating geometric tests of a linac c-arm in quality control in radiotherapy.

ABSTRACT:

Purpose

Assessment of the accuracy of geometric tests of a linac used in external beam therapy is crucial for ensuring precise dose delivery. In this paper, a new simulation-based method for assessing accuracy of such geometric tests is proposed and evaluated on a set of testing procedures.

Methods

Linac geometry testing methods used in this study are based on an established design of a two-module phantom. Electronic portal imaging device (EPID) images of fiducial balls contained in these modules can be used to automatically reconstruct linac geometry. The projection of the phantom modules fiducial balls onto the EPID detector plane is simulated for assumed nominal geometry of a linac. Then, random errors are added to the coordinates of the projections of the centers of the

SUBMITTER: Baran M 

PROVIDER: S-EPMC6753736 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature