PETRA, MSVAT-SPACE and SEMAC sequences for metal artefact reduction in dental MR imaging
Objectives: Dental MRI is often impaired by artefacts due to metallic dental materials. Several sequences were developed to reduce susceptibility artefacts. Here, we evaluated a set of sequences for artefact reduction for dental MRI for the first time.Methods: Artefact volume, signal-to-noise ratio...
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| Main Authors: | , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2017
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| In: |
European radiology
Year: 2017, Volume: 27, Issue: 12, Pages: 5104-5112 |
| ISSN: | 1432-1084 |
| DOI: | 10.1007/s00330-017-4901-1 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1007/s00330-017-4901-1 Verlag, Volltext: https://link.springer.com/article/10.1007/s00330-017-4901-1 
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| Author Notes: | Tim Hilgenfeld, Marcel Prager, Alexander Heil, Franz Sebastian Schwindling, Mathias Nittka, David Grodzki, Peter Rammelsberg, Martin Bendszus, Sabine Heiland |
| Summary: | Objectives: Dental MRI is often impaired by artefacts due to metallic dental materials. Several sequences were developed to reduce susceptibility artefacts. Here, we evaluated a set of sequences for artefact reduction for dental MRI for the first time.Methods: Artefact volume, signal-to-noise ratio (SNR) and image quality were assessed on a 3-T MRI for pointwise encoding time reduction with radial acquisition (PETRA), multiple-slab acquisition with view angle tilting gradient, based on a sampling perfection with application-optimised contrasts using different flip angle evolution (SPACE) sequence (MSVAT-SPACE), slice-encoding for metal-artefact correction (SEMAC) and compared to a standard SPACE and a standard turbo-spin-echo (TSE) sequence. Field-of-view and acquisition times were chosen to enable in vivo application. Two implant-supported prostheses were tested (porcelain fused to metal non-precious alloy and monolithic zirconia). Results: Smallest artefact was measured for TSE sequences with no difference between the standard TSE and the SEMAC. MSVAT-SPACE reduced artefacts about 56% compared to the standard SPACE. Effect of the PETRA was dependent on sample used. Image quality and SNR were comparable for all sequences except PETRA, which yielded poor results. Conclusion: There is no benefit in terms of artefact reduction for SEMAC compared to standard TSE. Usage of MSVAT-SPACE is advantageous since artefacts are reduced and higher resolution is achieved. Key Points: SEMAC is not superior to TSE in terms of artefact reduction. MSVAT-SPACE reduces susceptibility artefacts while maintaining comparable image quality.PETRA reduces susceptibility artefacts depending on material but offers poor image quality |
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| Item Description: | First online: 11 July 2017 Gesehen am 21.06.2018 |
| Physical Description: | Online Resource |
| ISSN: | 1432-1084 |
| DOI: | 10.1007/s00330-017-4901-1 |