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Related Experiment Videos

Concentric coil arrays for parallel MRI.

Michael A Ohliger1, Robert L Greenman, Randy Giaquinto

  • 1Harvard-MIT Division of Health Sciences and Technology, Boston, Massachusetts, USA. mohliger@mit.edu

Magnetic Resonance in Medicine
|October 6, 2005
PubMed
Summary

A novel concentric coil array design minimizes interference for improved parallel MRI. This new coil array offers comparable signal-to-noise ratio and enhanced directional invariance for advanced medical imaging.

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Area of Science:

  • Medical Imaging
  • Electrical Engineering
  • Physics

Background:

  • Parallel MRI requires specialized coil arrays for efficient spatial encoding.
  • Minimizing mutual inductance and noise correlations is crucial for optimizing MRI performance.
  • Existing coil array designs present limitations in multi-directional spatial encoding.

Purpose of the Study:

  • To introduce a novel concentric coil array design with enhanced spatial encoding capabilities.
  • To evaluate the signal-to-noise ratio (SNR) and performance of the proposed coil array in parallel MRI.
  • To compare the proposed array's performance against existing designs.

Main Methods:

  • Design and simulation of individual concentric coil elements with alternating current directions.

Related Experiment Videos

  • Construction of a four-element prototype concentric array.
  • Experimental comparison with three alternative four-element array designs using SNR measurements and undersampled data reconstruction.
  • Acquisition of cardiac images using the prototype array.

    • Main Results:

    • The concentric coil array demonstrates comparable overall SNR to competing designs.
    • Reconstruction of twofold undersampled data yields an average g-factor below 1.3 in directions parallel to the array plane.
    • The array exhibits substantial directional invariance, even with threefold undersampled data, outperforming alternative designs.
    • Successful acquisition of both fully-sampled and undersampled cardiac images.

    Conclusions:

    • Concentric coil structures are effective for designing specialized coil arrays for parallel MRI.
    • The proposed design offers significant advantages in spatial encoding and directional invariance.
    • This coil array technology holds promise for advancing parallel MRI applications, particularly in cardiac imaging.