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RF coils: A practical guide for nonphysicists.

Bernhard Gruber1,2,3, Martijn Froeling4, Tim Leiner4

  • 1A.A. Martinos Center for Biomedical Imaging, Harvard-MIT Division of Health Sciences & Technology, Massachusetts General Hospital, Charlestown, Massachusetts, USA.

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Summary
This summary is machine-generated.

Radiofrequency (RF) coils are crucial MRI hardware, acting as antennas to transmit and receive signals. This review covers their fundamental principles and technological advancements for clinicians and technicians.

Keywords:
RF coilarraysclinical applicationcoil array designnovel RF coilssignal-to-noise ratio

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Area of Science:

  • Medical Imaging Physics
  • Biomedical Engineering

Background:

  • Radiofrequency (RF) coils are fundamental hardware components in Magnetic Resonance Imaging (MRI).
  • They significantly influence MRI's spatial resolution, temporal resolution, sensitivity, and image uniformity.
  • Diverse RF coil designs have emerged, tailored for specific clinical applications.

Purpose of the Study:

  • To review the fundamental principles of MRI RF coils.
  • To summarize current technological advances and developments in RF coil technology.
  • To provide insights for clinicians and MRI technicians.

Main Methods:

  • Review of fundamental principles of RF coil operation (transmit and receive functions).
  • Summary of technological advancements and diverse RF coil designs.
  • Discussion from the perspective of clinical applications and technical implementation.

Main Results:

  • RF coils function as antennas, broadcasting RF power (Tx-Coil) to excite magnetization and receiving signals (Rx-Coil) from excited spins.
  • Transmit coils emit B1+ pulses to rotate net magnetization, while receive coils detect the changing magnetic flux (B1-) generating a signal.
  • Combined transmit/receive (Tx/Rx) coils integrate both functionalities.

Conclusions:

  • Understanding RF coil principles is essential for optimizing MRI performance.
  • Technological advancements continue to enhance MRI capabilities through innovative RF coil designs.
  • This review offers a foundational overview for professionals utilizing MRI technology.