CT beam dosimetric characterization procedure for personalized dosimetry.

CT beam dosimetric characterization procedure for personalized dosimetry.
Phys Med Biol. 2019 Mar 11;:
Authors: Rosendahl S, Bueermann L, Borowski M, Kortesniemi M, Sundell VM, Kosunen A, Siiskonen T
Abstract
Personalized dosimetry in computed tomography (CT) can be realized by a full Monte Carlo (MC) simulation of the scan procedure. Essential input data needed for the simulation are appropriate CT x-ray source models and a model of the patients body which is based on the CT image. The purpose of this work is to develop comprehensive procedures for the determination of CT x-ray source models and their verication by comparison of calculated and measured dose distributions in physical phantoms. Mobile equipment together with customized software was developed and used for non-invasive determination of equivalent source models of CT scanners under clinical conditions. Standard and physical anthropomorphic CT dose phantoms equipped with real-time CT dose probes at five representative positions were scanned. The accumulated dose was measured during the scan at the five positions. ImpactMC, a MC-based CT dose software program, was used to simulate the scan. The necessary inputs were obtained from the scan parameters, from the equivalent source models and from the material-segmented CT images of the phantoms. 3D dose distributions in the phantoms were simulated and the dose values calculated at the five positions inside the phantom were com...

Source: Physics in Medicine and Biology - March 10, 2019 Category: Physics Authors: Rosendahl S, Bueermann L, Borowski M, Kortesniemi M, Sundell VM, Kosunen A, Siiskonen T Tags: Phys Med Biol Source Type: research