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MRI Coils
• Intro / Overview •
  • Intro / Overview
A coil consists of one or more loops of conductive wire, looped around the core of the coil. Coils are part of the hardware of MRI machines and are used to create a magnetic field or to detect a changing magnetic field by voltage induced in the wire. A coil is usually a physically small antenna.
The perfect coil produces a uniform magnetic field without significant radiation.
Different types of MRI coils are used in MR systems:
Gradient coils are used to produce controlled variations in the main magnetic field (B0) to provide spatial localization of the signals and to apply reversal pulses in some imaging techniques.
MR imaging radio frequency coils to receive and/or transmit the RF signal.
Shim coils provide auxiliary magnetic fields in order to compensate for inhomogeneities in the main magnetic field of the MRI machine.

Common MRI coils used in clinical routine include:

MRI head coils / MRI brain coils are typically birdcage coils. Multi channel coils allow to speed up the scan time with parallel imaging particularly at 3T (coils with 8 to 16 channel / elements are common).
Transmit receive coils with their low image noise are particularly useful for spectroscopic imaging techniques.
Multi channel neuro coils enable to combine cervical spine MRI, brain MRI, and neurovascular MRI, etc.

MRI spine coils consist usually of up to 15 phased array elements with a lower number of channels.

Knee MRI coils are usually volume coils; multi channel coils are designed for high SNR and parallel imaging; transmit receive quadrature coils are also available.

Specialized extremity coils are build for high resolution images; obtainable are for example wrist MRI coils, shoulder MRI coils, foot coils, finger coils, etc.

Dedicated bilateral breast MRI coils provide easy positioning and maximum access also for MR guided interventions.

An endorectal MRI coil is a RF coil used to obtain high quality images of the rectum area; particularly for prostate imaging.

For general purpose all manufacturers offer surface coils with different designs for a high signal to noise ratio, faster image acquisition and patient throughput or higher image resolution.

The body coil, usually integrated in whole body MRI systems provides the possibility to image larger patients.

See also Gradient Coil, Radio Frequency Coil, Hardware and Coil Loading.

See also the related POLL result: '3rd party coils are better than the original manufacturer coils'

• View the NEWS results for 'Coil' (11).Open this link in a new window.

• View the DATABASE results for 'Coil' (193).Open this link in a new window

Further Reading:
Coil Types
     Radio Frequency Coil
     Transmit Receive Coil
     Transmitter Coil
     Receiver Coil
     Multiply Tuned Coil
Volume Coils
     Bird Cage Coil
     Circularly Polarized Coil
     Crossed Coil
     Helmholtz Pair Coil
     Paired Saddle Coil
     Quadrature Coil
     Single Turn Solenoid
Surface Coils
     Array Coil
     Body Wrap Around Coil
     Linearly Polarized Coil
     Phased Array Coil
     Saddle Coil
     Surface Coil NMR
Gradient Coils
     Figure 8 Coil
     Golay Coil
     Helmholtz Coil
     Maxwell Coil
     Paired Saddle Coil
     Shielded Gradient Coils

  Coil Types top
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