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Comparison between whole-body and head and neck neurovascular coils for 3-T magnetic resonance proton resonance frequency shift thermography guidance in the head and neck region

Lasers in Medical Science volume 33, pages 369–373 (2018)Cite this article

Abstract

The purpose of this study is to compare the image quality of magnetic resonance (MR) treatment planning images and proton resonance frequency (PRF) shift thermography images and inform coil selection for MR-guided laser ablation of tumors in the head and neck region. Laser ablation was performed on an agar phantom and monitored via MR PRF shift thermography on a 3-T scanner, following acquisition of T1-weighted (T1W) planning images. PRF shift thermography images and T2-weighted (T2W) planning images were also performed in the neck region of five normal human volunteers. Signal-to-noise ratios (SNR) and temperature uncertainty were calculated and compared between scans acquired with the quadrature mode body integrated coil and a head and neck neurovascular coil. T1W planning images of the agar phantom produced SNRs of 4.0 and 12.2 for the quadrature mode body integrated coil and head and neck neurovascular coil, respectively. The SNR of the phantom MR thermography magnitude images obtained using the quadrature mode body integrated coil was 14.4 versus 59.6 using the head and neck coil. The average temperature uncertainty for MR thermography performed on the phantom with the quadrature mode body integrated coil was 1.1 versus 0.3 °C with the head and neck coil. T2W planning images of the neck in five human volunteers produced SNRs of 28.3 and 91.0 for the quadrature mode body integrated coil and head and neck coil, respectively. MR thermography magnitude images of the neck in the volunteers obtained using the quadrature mode body integrated coil had a signal-to-noise ratio of 8.3, while the SNR using the head and neck coil was 16.1. The average temperature uncertainty for MR thermography performed on the volunteers with the body coil was 2.5 versus 1.6 °C with the head and neck neurovascular coil. The quadrature mode body integrated coil provides inferior image quality for both basic treatment planning sequences and MR PRF shift thermography compared with a neurovascular coil, but may nevertheless be adequate for clinical purposes.

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Acknowledgments

We thank Amy Schneider (Medtronic, Minneapolis, MN, USA) for assistance in performing the laser ablation procedure.

Funding

Grant funding was used to pay for the phantom and MRI scan time.

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Authors and Affiliations

  1. Department of Radiology, Pritzker School of Medicine, University of Chicago, 5841 S Maryland Avenue, Chicago, IL, 60637, USA

    Daniel Thomas Ginat, Gregory J. Anthony, Gregory Christoforidis, Aytekin Oto, Leonard Dalag & Steffen Sammet

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  1. Daniel Thomas Ginat
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  2. Gregory J. Anthony
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  3. Gregory Christoforidis
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  4. Aytekin Oto
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  5. Leonard Dalag
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Correspondence to Daniel Thomas Ginat.

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The authors declare that they have no conflict of interest.

Ethical approval

This work was approved by the IRB at our institution.

Grant support

This study was supported by Toshiba America Medical Systems/RSNA Research Seed Grant.

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Ginat, D.T., Anthony, G.J., Christoforidis, G. et al. Comparison between whole-body and head and neck neurovascular coils for 3-T magnetic resonance proton resonance frequency shift thermography guidance in the head and neck region. Lasers Med Sci 33, 369–373 (2018). https://doi.org/10.1007/s10103-017-2397-1

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  • DOI: https://doi.org/10.1007/s10103-017-2397-1

Keywords

  • Head and neck
  • Thermal ablation
  • MRI proton resonance frequency shift thermography
  • Quadrature body integrated coil
  • Phantom
  • Signal-to-noise ratio