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Visual grading evaluation of commercially available metal artefact reduction techniques in hip prosthesis computed tomography
Department of Medical Physics, Faculty of Medicine and Health, Örebro University, Örebro, Sweden; Department of Medical Physics, Örebro University Hospital, Örebro, Sweden.
Department of Medical Physics, Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
Örebro universitet, Institutionen för medicinska vetenskaper. Department of Radiology, Örebro University Hospital, Örebro, Sweden.ORCID-id: 0000-0003-3253-8967
Örebro universitet, Institutionen för medicinska vetenskaper. Department of Radiology, Örebro University Hospital, Örebro, Sweden.
Vise andre og tillknytning
2016 (engelsk)Inngår i: British Journal of Radiology, ISSN 0007-1285, E-ISSN 1748-880X, Vol. 89, nr 1063, artikkel-id 20150993Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Objectives: To evaluate metal artefact reduction (MAR) techniques from four computed tomography (CT) vendors in hip prosthesis imaging.

Methods: Bilateral hip prosthesis phantom images, obtained by using MAR algorithms for single energy CT data or dual energy CT (DECT) data and by monoenergetic reconstructions of DECT data, were visually graded by five radiologists using ten image quality criteria. Comparisons between the MAR images and a reference image were performed for each scanner separately. Ordinal probit regression analysis was used.

Results: The MAR algorithms in general improved the image quality based on the majority of the criteria (up to between 8/10 and 10/10) with a statistically improvement in overall image quality (P<0.001). However, degradation of image quality, such as new artefacts, was seen in some cases. A few monoenergetic reconstruction series improved the image quality (P<0.004) for one of the DECT scanners, but it was only improved for some of the criteria (up to 5/10). Monoenergetic reconstructions resulted in worse image quality for the majority of the criteria (up to 7/10) for the other DECT scanner.

Conclusions: The MAR algorithms improved the image quality of the hip prosthesis CT images. However, since additional artefacts and degradation of image quality were seen in some cases, all algorithms should be carefully evaluated for every clinical situation. Monoenergetic reconstructions were in general concluded to be insufficient for reducing metal artifacts. Advances in knowledge: Qualitative evaluation of the usefulness of several MAR techniques from different vendors in CT imaging of hip prosthesis.

sted, utgiver, år, opplag, sider
London, United Kingdom: British Institute of Radiology , 2016. Vol. 89, nr 1063, artikkel-id 20150993
HSV kategori
Forskningsprogram
Radiologi
Identifikatorer
URN: urn:nbn:se:oru:diva-50103DOI: 10.1259/bjr.20150993ISI: 000378096400009PubMedID: 27123700OAI: oai:DiVA.org:oru-50103DiVA, id: diva2:925863
Tilgjengelig fra: 2016-05-03 Laget: 2016-05-03 Sist oppdatert: 2019-04-12bibliografisk kontrollert
Inngår i avhandling
1. Metal artifacts in computed tomography: impact of reduction methods on image quality and radiotherapy treatment planning
Åpne denne publikasjonen i ny fane eller vindu >>Metal artifacts in computed tomography: impact of reduction methods on image quality and radiotherapy treatment planning
2018 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Degradation of image quality by metal artifacts is a common problem in computed tomography (CT) imaging, which can limit the diagnostic value of a CT examination and also introduce inaccuracies in radiotherapy (RT) treatment planning. In recent years, commercial metal artifact reduction (MAR) methods have been launched by several CT vendors. The overall aim of this thesis was to evaluate MAR methods in diagnostic imaging and RT treatment planning.

Evaluations of hip prosthesis phantom CT images showed that MAR algorithms in general improved image quality, based on both visual grading analysis and quantitative measures, while the application of virtual monoenergetic reconstructions insufficiently reduced metal artifacts. In some cases additional artifacts were introduced by the MAR algorithms. MAR algorithms were also evaluated in hip prosthesis phantom CT imaging used for proton therapy treatment planning, where improvements in dose calculation accuracy were observed.

Studies of Head & Neck (H&N) implant CT images in RT treatment planning were also performed. By visual grading of anatomy visualization with respect to target delineation in dental implant patient images, MAR algorithms were shown to significantly improve image quality. However, only minor effects of H&N implant artifacts on proton dose distributions were seen. The impact might be greater for more severe artifacts than those studied here, and thus further investigations of such cases are needed.

In conclusion, MAR algorithms have been shown to enhance image quality for diagnostic applications and to improve anatomy visualization in RT treatment planning. The MAR algorithms led to increased proton dose calculation accuracy in some cases, while in other situations only minor changes were seen.

sted, utgiver, år, opplag, sider
Örebro: Örebro University, 2018. s. 81
Serie
Örebro Studies in Medicine, ISSN 1652-4063 ; 172
Emneord
computed tomography, metal artifacts, image quality, visual grading analysis, radiotherapy, proton therapy, hip prosthesis, dental implants
HSV kategori
Identifikatorer
urn:nbn:se:oru:diva-63420 (URN)978-91-7529-228-1 (ISBN)
Disputas
2018-03-09, Örebro universitet, Campus USÖ, hörsal C3, Södra Grev Rosengatan 32, Örebro, 09:30 (svensk)
Opponent
Veileder
Tilgjengelig fra: 2017-12-19 Laget: 2017-12-19 Sist oppdatert: 2018-02-15bibliografisk kontrollert

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