Artifact reduction from metallic dental materials in T1-weighted spin-echo imaging at 3.0 tesla

Sang Young Zho, Min Oh Kim, Keun Woo Lee, Dong Hyun Kim

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Purpose: To investigate and propose a method of artifact reduction arising from metallic dental materials by applying a slice-encoding for metal artifact correction (SEMAC) technique on T1-weighted spin-echo (SE) imaging at 3 Tesla. Materials and Methods: The view angle tilting (VAT) technique was adapted to conventional T1-weighted spin-echo (SE) sequence to correct the in-plane distortion, and the SEMAC technique was used for correcting the remaining through-plane distortions. Fourier transform based B0 field simulations were performed to estimate the amount of field perturbation and a scout imaging method was developed which guide in selecting the number of slice-encodings needed in SEMAC sequences. Phantoms of six different dental materials with various shapes and sizes that are used in practice (amalgam; titanium implant; gold and Ni-Cr crowns; Ni-Ti and stainless steel orthodontic wires) were imaged. In vivo images of two subjects were also acquired. The amounts of artifact reduction were quantified in phantom studies. Results: Compared with conventional SE imaging in phantom studies, in-plane artifacts were reduced by up to 43% in the VAT SE images and 80% in the SEMAC images. Through-plane artifacts were reduced by up to 65% in SEMAC images. In vivo SEMAC images also showed reduced artifacts. Conclusion: The SEMAC technique can mitigate artifact caused by metallic dental materials for T1w-SE imaging.

Original languageEnglish
Pages (from-to)471-478
Number of pages8
JournalJournal of Magnetic Resonance Imaging
Volume37
Issue number2
DOIs
Publication statusPublished - 2013 Feb 1

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All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

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