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Related Experiment Videos

Coupling and decoupling theory and its application to the MRI phased array.

Ray F Lee1, Randy O Giaquinto, Christopher J Hardy

  • 1Corporate Research and Development Center, General Electric Company, Schenectady, New York 12309, USA. lee@crd.ge.com

Magnetic Resonance in Medicine
|July 12, 2002
PubMed
Summary

A new theory and method decouple magnetic resonance imaging (MRI) phased-array coils without overlapping elements. This advance enables optimized coil placement for parallel imaging and transmit coils.

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Area of Science:

  • Medical Imaging
  • Electrical Engineering
  • Physics

Background:

  • Classical MRI phased-array design relies on coil overlapping and low input impedance preamplifiers for decoupling.
  • Overlapping coils in MRI phased arrays can limit distinct coil sensitivities needed for parallel imaging.
  • Preamplifier decoupling is ineffective when phased arrays are used as transmit coils.

Purpose of the Study:

  • To introduce a coupling and decoupling theory for MRI phased arrays.
  • To develop a novel method for decoupling phased-array coils without nearest-neighbor overlap.
  • To enable flexible coil element placement for improved parallel spatial encoding and transmit applications.

Main Methods:

  • Developed a coupling and decoupling theory to understand signal relations in MRI phased arrays.

Related Experiment Videos

  • Proposed a new decoupling method based on a 2n-port interface system for n-element phased arrays.
  • Demonstrated that a four-port interface can decouple a two-element phased array, serving as a building block for larger arrays.

    • Main Results:

    • The new theory provides a better understanding of coupled and uncoupled signals in phased arrays.
    • A novel method successfully decouples phased-array coils without requiring overlapping elements.
    • Experimental results confirm the efficacy of the four-port interface for a two-element phased array.

    Conclusions:

    • The proposed 2n-port interface system offers a versatile solution for decoupling MRI phased arrays.
    • This method removes constraints on coil element placement, optimizing parallel spatial encoding.
    • The decoupling technique is applicable to both receive and transmit phased-array coils in MRI.