Beeinflussung der Flussdichte intraoraler Dentalmagnete im 1,5 und 3 Tesla-MRT

Abstract

As a precaution, the worst-case scenario, i. e. an antiparallel orientation, should be assumed when using a duo-magnet system. If an MRI can be postponed, the general dentist should remove implant-borne magnets. If there is a vital indication, irreversible damage to the magnets is acceptable in consultation with the patient since the replacement costs are irrelevant given the underlying disease.

Metal artefact reduction in MRI at both 1.5 and 3.0 T using slice encoding for metal artefact correction and view angle tilting

“…An increased radiofrequency (RF) bandwidth, a higher readout bandwidth, a smaller slice thickness, shorter echo spacing and choosing short tau inversion recovery (STIR) for fat suppression instead of spectral fat saturation are also essential approaches for metal artefact correction to various degrees. 8 Based on the knowledge above, several specific sequence strategies have been recently developed for more effective reduction of metal-induced artefacts, including view angle tilting (VAT), slice encoding for metal artefact correction with VAT technique (SEMAC-VAT) and multiacquisition with variable resonance image combination (MAVRIC). [9][10][11][12] VAT technique uses an extra gradient in the slice-select direction during the readout gradient, such that the image pixels appear as if they were viewed from an angle.…”