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Technical Note: A custom-designed flexible MR coil array for spine radiotherapy treatment planning.

Neelam Tyagi1, Kristen L Zakian1,2, Michel Italiaander3

  • 1Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, NY, 10065, USA.

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Summary

A new flexible radiofrequency (RF) spine coil array significantly improves MRI signal-to-noise ratio (SNR) and allows for faster imaging. This custom coil enhances spine radiotherapy planning by providing higher quality images.

Keywords:
SENSE parallel imagingcustom coil arraynoise correlation matrixposterior coilspine SBRT

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Area of Science:

  • Medical Imaging
  • Radiotherapy Physics
  • Biomedical Engineering

Background:

  • Optimizing Magnetic Resonance Imaging (MRI) for spine radiotherapy treatment planning is crucial for accurate dose delivery.
  • Standard MRI coils may have limitations in conformability and signal-to-noise ratio (SNR) for specific anatomical regions like the spine.

Purpose of the Study:

  • To evaluate the performance and image quality of a custom-built, flexible radiofrequency (RF) spine coil array.
  • To assess its utility for spine radiotherapy treatment planning.

Main Methods:

  • Developed a 32-channel flexible, receive-only RF spine coil array for a 3 Tesla (3T) MRI scanner.
  • Assessed coil performance using phantoms and four volunteers, comparing it to the vendor's standard posterior coil array.
  • Evaluated signal-to-noise ratio (SNR), field of view, and noise correlation.

Main Results:

  • The custom spine array demonstrated a ~30 cm field of view, covering at least 10 vertebrae.
  • Achieved a 3-fold higher SNR at the spinal cord depth compared to the vendor coil.
  • Enabled high-resolution (1.1 mm isotropic) 3D imaging in under 5 minutes with significant acceleration.

Conclusions:

  • The custom-designed, form-fitting flexible spine coil array offers superior SNR and acceleration capabilities.
  • This technology enhances MRI for spine radiotherapy planning, potentially improving treatment accuracy.