Rosendahl , S , Büermann , L , Borowski , M , Kortesniemi , M , Sundell , V-M , Kosunen , A & Siiskonen , T 2019 , ' CT beam dosimetric characterization procedure for personalized dosimetry ' , Physics in Medicine and Biology , vol. 64 , no. 7 , 075009 . https://doi.org/10.1088/1361-6560/ab0e97
Title: | CT beam dosimetric characterization procedure for personalized dosimetry |
Author: | Rosendahl , S.; Büermann, L.; Borowski, M.; Kortesniemi, M.; Sundell, V-M; Kosunen, A.; Siiskonen, T. |
Contributor organization: | Department of Diagnostics and Therapeutics Clinicum HUS Medical Imaging Center |
Date: | 2019-04 |
Language: | eng |
Number of pages: | 17 |
Belongs to series: | Physics in Medicine and Biology |
ISSN: | 0031-9155 |
DOI: | https://doi.org/10.1088/1361-6560/ab0e97 |
URI: | http://hdl.handle.net/10138/300927 |
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 patient's 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 verification 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, an 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 compared to measured dose values. Initial results were obtained by means of a General Electric Optima CT 660 and a Toshiba (Canon) Aquilion ONE. In general, the measured and calculated dose values were within relative uncertainties that had been estimated to be less than 10%. The procedures developed were found to be viable and rapid. The procedures are applicable to any scanner type under clinical conditions without making use of the service mode with stationary x-ray tube position. Results show that the procedures are well suited for determining and verifying the equivalent source models needed for personalized CT dosimetry based on post-scan MC calculations. |
Subject: |
computed tomography
personalized radiation dosimetry Monte Carlo simulation equivalent source models MONTE-CARLO TOOL HALF-VALUE LAYER X-RAY TUBE DOSE CALCULATIONS ENERGY-SPECTRA VALIDATION FILTRATION 3126 Surgery, anesthesiology, intensive care, radiology |
Peer reviewed: | Yes |
Rights: | cc_by |
Usage restriction: | openAccess |
Self-archived version: | publishedVersion |
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