Knowledge of Artifacts in MRI for Dental Healthcare Professionals

Abstract

Magnetic resonance imaging(MRI) is a non-invasive diagnostic technique that utilizes magnetic fields to obtain cross-sectional images of living organisms. However, a phenomenon called artifacts can lead to the detection of erroneous signals. The primary artifacts include motion artifacts, partial volume effects, and susceptibility artifacts.

Motion artifacts are the phenomenon whereby patient movement causes image blurring, necessitating head fixation during examinations. Partial volume effects occur when the averaging of MRI data results in signals being visualized in varying states. Although reducing the slice thickness can suppress this effect, it causes the problem of decreasing the signal-to-noise ratio (S/N ratio). Susceptibility artifacts arise in regions with significant differences in susceptibility within the body, with highly susceptible materials being the primary cause. In dentistry, oral prosthetics are often the source of these artifacts, with particular attention required for orthodontic wires and magnetic attachments.

By understanding and addressing these artifacts appropriately, it is possible to effectively utilize MRI, leading to accurate diagnoses.