Quantification of Metal Artefacts from Orthodontic Brackets in CT Images: A Modified Method
10.21315/aos2020.15.2.428
- Author:
Mahmud Mohammeda
1
Author Information
1. School of Dental Sciences, Universiti Sains Malaysia, 16150 Kota Bharu, Kelantan, Malaysia
- Collective Name:Norma Ab. Rahman; Ahmad Hadif Zaidin Samsudin; Johari Yap Abdullah
- Publication Type:Journal Article
- Keywords:
Artefacts;
computer-assisted image analysis;
diagnostic imaging;
multislice CT;
radiographic image interpretation
- From:Archives of Orofacial Sciences
2020;15(2):109-117
- CountryMalaysia
- Language:English
-
Abstract:
Any metallic object within the CT scanning field can produce metal artefacts, which will degrade
the diagnostic image quality. Previous methods described for quantifying this kind of artefacts were
complicated and difficult to reproduce. The purpose of this study was to introduce a new rapid method
for quantifying the artefacts produced in craniofacial CT images. This is an in-vitro experimental study.
Four different compositions of orthodontic brackets were bonded consecutively in the tooth surfaces
of a cadaveric skull head. All scans were performed by a single operator using the same CT machine
followed by a standard scanning protocol. Artefact intensity for all data sets was quantified by following
a modified method with a freely available open-source software ImageJ. All datasets were duplicated
where metal artefacts were quantified according to the previous conventional method. Statistical
analysis included independent samples t-test for validation and intraclass correlation coefficient (ICC)
with a 95% confidence interval for both intra- and inter-examiner reliability. The modified method
of measuring artefact score exhibited excellent intra (0.997–0.941) and inter-rater (0.996–0.905)
reliability. In addition, no significant difference (p = 0.072) of mean artefact score was noted between
the groups measured by the modified method and the conventional method. This modified method for
measuring the artefact intensity is valid and reliable.
- Full text:2.2020my194.pdf
