Get access

Initial feasibility testing of limited field of view magnetic resonance thermometry using a local cardiac radiofrequency coil

Authors

  • Nelly A. Volland,

    Corresponding author
    1. Utah Center for Advanced Imaging Research, Department of Radiology, University of Utah, Salt Lake City, Utah, USA
    2. Comprehensive Arrhythmia Research and Management Center, University of Utah, Salt Lake City, Utah, USA
    • Utah Center for Advanced Imaging Research, Department of Radiology, University of Utah, 729 Arapeen Drive, Salt Lake City, UT 84108. E-mail: nvolland@ucair.med.utah.edu

    Search for more papers by this author
  • Eugene G. Kholmovski,

    1. Utah Center for Advanced Imaging Research, Department of Radiology, University of Utah, Salt Lake City, Utah, USA
    2. Comprehensive Arrhythmia Research and Management Center, University of Utah, Salt Lake City, Utah, USA
    Search for more papers by this author
  • Dennis L. Parker,

    1. Utah Center for Advanced Imaging Research, Department of Radiology, University of Utah, Salt Lake City, Utah, USA
    2. Comprehensive Arrhythmia Research and Management Center, University of Utah, Salt Lake City, Utah, USA
    Search for more papers by this author
  • J. Rock Hadley

    1. Utah Center for Advanced Imaging Research, Department of Radiology, University of Utah, Salt Lake City, Utah, USA
    2. Comprehensive Arrhythmia Research and Management Center, University of Utah, Salt Lake City, Utah, USA
    Search for more papers by this author

Abstract

The visualization of lesion formation in real time is one potential benefit of carrying out radiofrequency ablation under magnetic resonance (MR) guidance in the treatment of atrial fibrillation. MR thermometry has the potential to detect such lesions. However, performing MR thermometry during cardiac radiofrequency ablation requires high temporal and spatial resolution and a high signal-to-noise ratio. In this study, a local MR coil (2-cm diameter) was developed to investigate the feasibility of performing limited field of view MR thermometry with high accuracy and speed. The local MR coil allowed high-resolution (1 × 1 × 3 mm3) image acquisitions in 76.3 ms with a field of view 64 × 32 mm2 during an open-chest animal experiment. This represents a 4-fold image acquisition acceleration and an 18-fold field of view reduction compared to that achieved using external MR coils. The signal sensitivity achieved using the local coil was over 20 times greater than that achievable using external coils with the same scan parameters. The local coil configuration provided fewer artifacts and sharper and more stable images. These results demonstrate that MR thermometry can be performed in the heart wall and that lesion formation can be observed during radiofrequency ablation procedures in a canine model. Magn Reson Med, 70:994–1004, 2013. © 2012 Wiley Periodicals, Inc.>

Ancillary