Reducing dose of Cone-Beam CT used for patient positioning in radiooncology

  • Cone-Beam computed tomography (CBCT) has become the most important component of modern radiotherapy for positioning tumor patients directly before treatment. In this work we investigate alternations to standard acquisition protocol, called preset, for patients with a tumor in the thoracic region. The effects of the changed acquisition parameters on the image quality are evaluated using the Catphan Phantom and the image analysis software Smári. The weighted CT dose index (CTDIW) is determined in each case and the effects of the different acquisition protocols on the patient dose are classified accordingly. Additionally, the clinical suitability of alternative presets is tested by investigating correctness of image registration using the CIRS thorax phantom. The results show that a significant dose reduction can be achieved. It can be reduced by 51% for a full rotation by adjusting the gantry speed.

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Metadaten
Author:Verena Gorges, Waldemar Zylka
DOI:https://doi.org/10.1515/cdbme-2021-2058
ISSN:2364-5504
Parent Title (English):Current Directions in Biomedical Engineering
Document Type:Article
Language:English
Date of Publication (online):2021/12/23
Year of first Publication:2021
Publishing Institution:Westfälische Hochschule Gelsenkirchen Bocholt Recklinghausen
Release Date:2021/12/23
Volume:7
Issue:2
First Page:227
Last Page:230
Departments / faculties:Fachbereiche / Elektrotechnik und angewandte Naturwissenschaften
Licence (German):License LogoEs gilt das Urheberrechtsgesetz

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