Can CT scan protocols used for radiotherapy treatment planning be adjusted to optimise image quality and patient dose? A systematic review

Davis, Anne, Palmer, AL and Nisbet, Andrew (2017) Can CT scan protocols used for radiotherapy treatment planning be adjusted to optimise image quality and patient dose? A systematic review British Journal of Radiology, 90 (1076).

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Abstract

This article reviews publications related to the use of CT scans for radiotherapy treatment planning, specifically the impact of scan protocol changes on CT number and treatment planning dosimetry and on CT image quality. A search on PubMed and EMBASE and a subsequent review of references yielded 53 relevant articles. CT scan parameters significantly affect image quality. Some will also affect Hounsfield unit (HU) values, though this is not comprehensively reported on. Changes in tube kilovoltage and, on some scanners, field of view and reconstruction algorithms have been found to produce notable HU changes. The degree of HU change which can be tolerated without changing planning dose by >1% depends on the body region and size, planning algorithms, treatment beam energy and type of plan. A change in soft-tissue HU value has a greater impact than changes in HU for bone and air. The use of anthropomorphic phantoms is recommended when assessing HU changes. There is limited published work on CT scan protocol optimization in radiotherapy. Publications suggest that HU tolerances of ±20 HU for soft tissue and of ±50 HU for the lung and bone would restrict dose changes in the treatment plan to <1%. Literature related to the use of CT images in radiotherapy planning has been reviewed to establish the acceptable level of HU change and the impact on image quality of scan protocol adjustment. Conclusions have been presented and further work identified.

Item Type:	Article
Subjects :	Physics
Divisions :	Faculty of Engineering and Physical Sciences > Physics
Authors :	Name Email ORCID Davis, Anne a.t.davis@surrey.ac.uk Palmer, AL Nisbet, Andrew A.Nisbet@surrey.ac.uk
Date :	23 May 2017
DOI :	10.1259/bjr.20160406
Copyright Disclaimer :	© 2017 The Authors. Published by the British Institute of Radiology
Depositing User :	Symplectic Elements
Date Deposited :	04 May 2017 08:24
Last Modified :	16 Jan 2019 17:14
URI:	http://epubs.surrey.ac.uk/id/eprint/814105

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