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MSVAT-SPACE-STIR and SEMAC-STIR for reduction of metallic artifacts in 3T head and neck MRI

BACKGROUND AND PURPOSE: The incidence of metallic dental restorations and implants is increasing, and head and neck MR imaging is becoming challenging regarding artifacts. Our aim was to evaluate whether multiple-slab acquisition with view angle tilting gradient based on a sampling perfection with a...

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Main Authors: Hilgenfeld, Tim (Author) , Prager, Marcel (Author) , Schwindling, Franz Sebastian (Author) , Nittka, Mathias (Author) , Rammelsberg, Peter (Author) , Bendszus, Martin (Author) , Heiland, Sabine (Author) , Jürchott, Alexander (Author)
Format: Article (Journal)
Language:English
Published: March 30, 2018
In: American journal of neuroradiology
Year: 2018, Volume: 39, Issue: 7, Pages: 1322-1329
ISSN:1936-959X
DOI:10.3174/ajnr.A5678
Online Access:Verlag, Volltext: https://doi.org/10.3174/ajnr.A5678
Verlag, Volltext: http://www.ajnr.org/content/39/7/1322
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Author Notes:T. Hilgenfeld, M. Prager, F.S. Schwindling, M. Nittka, P. Rammelsberg, M. Bendszus, S. Heiland, and A. Juerchott

MARC

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520 |a BACKGROUND AND PURPOSE: The incidence of metallic dental restorations and implants is increasing, and head and neck MR imaging is becoming challenging regarding artifacts. Our aim was to evaluate whether multiple-slab acquisition with view angle tilting gradient based on a sampling perfection with application-optimized contrasts by using different flip angle evolution (MSVAT-SPACE)-STIR and slice-encoding for metal artifact correction (SEMAC)-STIR are beneficial regarding artifact suppression compared with the SPACE-STIR and TSE-STIR in vitro and in vivo. - MATERIALS AND METHODS: At 3T, 3D artifacts of 2 dental implants, supporting different single crowns, were evaluated. Image quality was evaluated quantitatively (normalized signal-to-noise ratio) and qualitatively (2 reads by 2 blinded radiologists). Feasibility was tested in vivo in 5 volunteers and 5 patients, respectively. - RESULTS: Maximum achievable resolution and the normalized signal-to-noise ratio of MSVAT-SPACE-STIR were higher compared with SEMAC-STIR. Performance in terms of artifact correction was dependent on the material composition. For highly paramagnetic materials, SEMAC-STIR was superior to MSVAT-SPACE-STIR (27.8% smaller artifact volume) and TSE-STIR (93.2% less slice distortion). However, MSVAT-SPACE-STIR reduced the artifact size compared with SPACE-STIR by 71.5%. For low-paramagnetic materials, MSVAT-SPACE-STIR performed as well as SEMAC-STIR. Furthermore, MSVAT-SPACE-STIR decreased artifact volume by 69.5% compared with SPACE-STIR. The image quality of all sequences did not differ systematically. In vivo results were comparable with in vitro results. - CONCLUSIONS: Regarding susceptibility artifacts and acquisition time, MSVAT-SPACE-STIR might be advantageous over SPACE-STIR for high-resolution and isotropic head and neck imaging. Only for materials with high-susceptibility differences to soft tissue, the use of SEMAC-STIR might be beneficial. Within limited acquisition times, SEMAC-STIR cannot exploit its full advantage over TSE-STIR regarding artifact suppression. 
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