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PETRA, MSVAT-SPACE and SEMAC sequences for metal artefact reduction in dental MR imaging

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Abstract

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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Abbreviations

CBCT:

Cone beam computed tomography

MDCT:

Multi-detector computed tomography

MSVAT-SPACE:

Multiple-slab acquisition with VAT gradient, based on a SPACE sequence

PETRA:

Pointwise encoding time reduction with radial acquisition

RF:

Radio frequency

ROI:

Region of interest

SEMAC:

Slice-encoding for metal artefact correction

SNR:

Signal-to-noise ratio

SPACE:

Sampling perfection with application-optimised contrasts using different flip angle evolution

TSE:

Turbo-spin-echo sequence

UTE:

Ultrashort time of echo sequence

VAT:

View angle tilting

WIP:

Work in progress

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Acknowledgements

TH receives funding from a postdoctoral fellowship of the Medical Faculty of the University of Heidelberg. The authors would like to thank Stefanie Sauer, PhD, a pharmacist at the Department of Pharmacy, Heidelberg University Hospital, for her contribution to the MRI phantom. Furthermore, we would like to thank NORAS MRI products GmbH, especially Daniel Gareis, MSc, for providing a prototype of the 16-channel multipurpose coil.

Author information

Author notes

  1. Tim Hilgenfeld and Marcel Prager these authors contributed equally to this work.

Authors and Affiliations

  1. Department of Neuroradiology, Heidelberg University Hospital, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany

    Tim Hilgenfeld, Marcel Prager, Alexander Heil, Martin Bendszus & Sabine Heiland

  2. Section of Experimental Radiology, Heidelberg University Hospital, Heidelberg, Germany

    Marcel Prager & Sabine Heiland

  3. Department of Prosthodontics, Heidelberg University Hospital, Heidelberg, Germany

    Franz Sebastian Schwindling & Peter Rammelsberg

  4. Siemens Healthcare GmbH, Erlangen, Germany

    Mathias Nittka & David Grodzki

Authors
  1. Tim Hilgenfeld
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  2. Marcel Prager
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  3. Alexander Heil
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Corresponding author

Correspondence to Tim Hilgenfeld.

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Guarantor

The scientific guarantor of this publication is Dr. rer. nat. Sabine Heiland.

Conflict of interest

The authors of this manuscript declare relationships with the following companies: Siemens Healthcare GmbH and NORAS MRI products GmbH. The co-authors M.Nittka, PhD, and D.Grodzki, PhD, are employees of Siemens Healthcare GmbH and were involved in the technical development of the metal-artefact-reducing pulse sequences.

Funding

The study was supported in part by the Dietmar-Hopp-Stiftung (project no 23011228).

Statistics and biometry

No complex statistical methods were necessary for this paper.

Informed consent

Informed consent was not required since no living animals were studied.

Ethical approval

Institutional review board approval was not required since no living animals were studied.

Methodology

• Prospective

• experimental

• performed at one institution

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Hilgenfeld, T., Prager, M., Heil, A. et al. PETRA, MSVAT-SPACE and SEMAC sequences for metal artefact reduction in dental MR imaging. Eur Radiol 27, 5104–5112 (2017). https://doi.org/10.1007/s00330-017-4901-1

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  • DOI: https://doi.org/10.1007/s00330-017-4901-1

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