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Am J Orthod Dentofacial Orthop. 2017 Mar;151(3):484-499. doi: 10.1016/j.ajodo.2016.07.020.

Effects of orthodontic appliances on the diagnostic quality of magnetic resonance images of the head.

Author information

1
Private Practice, Ottawa, Ontario, Canada.
2
Department of Diagnostic Imaging, Hospital for Sick Children, Toronto, Ontario, Canada.
3
Department of Medical Imaging, University of Toronto; Department of Diagnostic Imaging, Hospital for Sick Children, Toronto, Ontario, Canada.
4
Discipline of Orthodontics, Faculty of Dentistry, University of Toronto; Division of Orthodontics, Hospital for Sick Children, Toronto, Ontario, Canada.
5
Division of Biostatistics, Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada.
6
Discipline of Orthodontics, Faculty of Dentistry, University of Toronto; Division of Orthodontics, Hospital for Sick Children, Toronto, Ontario, Canada. Electronic address: sunjaysuri@hotmail.com.

Abstract

INTRODUCTION:

The influence of 4 commonly used fixed orthodontic appliances on artifact formation and diagnostic quality of magnetic resonance (MR) images of the head produced by a 3-T MR scanner was studied.

METHODS:

Stainless steel brackets, ceramic brackets, combination of ceramic brackets and steel molar tubes, and multistranded steel mandibular lingual retainers were embedded into custom-made trays for each of 10 adult subjects. Head MR scans of 9 regions were acquired for each subject wearing these trays. Sagittal T1-weighted, axial T2-weighted, axial gradient-recalled, axial diffusion-weighted, noncontrast axial MR angiography, and axial fluid-attenuated inversion recovery MR sequences were included. Two neuroradiologists evaluated image distortions and diagnostic qualities of the 1314 acquired images (13860 image slices).

RESULTS:

The images were affected by appliance, head region, and MR sequence. Stainless steel brackets and molar tubes affected the images the most, and ceramic brackets caused minimal image distortion.

CONCLUSIONS:

Head MR images are differentially affected by orthodontic appliances. The appliance, region imaged, and MR sequence should be considered before imaging patients wearing fixed orthodontic appliances.

PMID:
28257733
DOI:
10.1016/j.ajodo.2016.07.020
[Indexed for MEDLINE]

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