MRI susceptibility artefacts caused by orthodontic wire
Yuri Iwamoto1, Hiroaki Shimamoto1, Doaa Felemban2
1Department of Oral and Maxillofacial Radiology, Osaka University Graduate School of Dentistry, Suita 565-0871, Japan.
Dento Maxillo Facial Radiology
|June 13, 2024
Summary
Stainless steel orthodontic wires create larger magnetic susceptibility artifacts on MRI than cobalt chromium or titanium wires. Wire properties and MRI sequences significantly influence artifact size and extent.
Area of Science:
- Biomaterials Science
- Medical Imaging Physics
- Orthodontics
Background:
- Orthodontic wires can cause magnetic susceptibility artifacts in Magnetic Resonance Imaging (MRI).
- Understanding these artifacts is crucial for accurate MRI interpretation in patients with orthodontic appliances.
Purpose of the Study:
- To evaluate magnetic susceptibility artifacts produced by various orthodontic wires on MRI.
- To determine the influence of wire properties and MRI sequences on artifact magnitude.
Main Methods:
- Arch form orthodontic wires (stainless steel, cobalt chromium, titanium) were scanned in a polyester phantom using a 1.5-T MRI scanner.
- Standard T1-weighted spin echo (SE) and gradient echo (GRE) sequences, along with eight other sequences, were employed.
- Artifacts were quantified using ASTM F2119-07 standards and OsiriX software.
Main Results:
- Stainless steel (SS) wires produced significantly larger black/white artifacts than cobalt chromium (CC) and titanium (Ti) wires with SE/GRE sequences (P < .01).
- Gradient echo (GRE) sequences showed the highest black artifact volume with SS wires.
- SS wires also exhibited a significantly longer cranio-caudal artifact extent (P < .01).
Conclusions:
- Ferromagnetic/paramagnetic orthodontic wires induce artifacts by altering magnetic field homogeneity.
- Stainless steel wires generate the most substantial artifacts, followed by cobalt chromium and titanium wires.
Related Concept Videos
01:24Magnetic Resonance Imaging
5.1K
Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
5.1K
01:14Imaging Studies I: CT and MRI
228
Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
228