An analytical formalism for the assessment of dose uncertainties due to positioning uncertainties.

ABSTRACT:

Purpose

To present an analytical formalism for the in depth assessment of uncertainties of field output factors in small fields related to detector positioning based on dose profile measurements. Additionally, a procedure for the propagation of these uncertainties was developed.

Methods

Based on the assumption that one dimensional and two dimensional second-order polynomial functions can be fitted to dose profiles of small photon beams, equations for the calculation of the expectation value, the variance, and the standard deviation were developed. The following fitting procedures of the dose profiles were considered: A one-dimensional case (1D), a quasi two-dimensional case (2Dq) based on independently measured line profiles and a full 2D case (2Df) which also considers cros

SUBMITTER: Lechner W 

PROVIDER: S-EPMC7078844 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature