RF Coils in MRI

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Questions and Answers

What is the main function of RF coils in MRI?

  • To transmit and receive RF signals (correct)
  • To create the magnetic field
  • To enhance image color
  • To cool the MRI machine

Which type of RF coil is specifically designed to receive signals only?

  • Transmitter Coil
  • Receive Only Coil (correct)
  • Transceiver Coil
  • Volume Coil

Which coil type provides increased magnetic sensitivity for tissues near the coil?

  • Volume Coil
  • Phrased Array Coil
  • Surface Coil (correct)
  • Quadrature Coil

What characteristic differentiates phased array coils from other RF coil types?

<p>They combine multiple smaller coils for higher effectiveness. (D)</p> Signup and view all the answers

Which of the following is NOT a type of volume coil?

<p>Array Coil (A)</p> Signup and view all the answers

Why are surface coils less sensitive to tissues that are far from them?

<p>Magnetic sensitivity decreases with distance. (D)</p> Signup and view all the answers

Which configuration is common in quadrature coils?

<p>Saddle Shape or Surface Coil (B)</p> Signup and view all the answers

Which statement accurately describes the function of transceiver coils?

<p>They both transmit and receive RF signals. (C)</p> Signup and view all the answers

Flashcards

RF coils

Components in MRI that transmit radio waves and receive signals, affecting image quality.

Volume coils

MRI coils designed to cover a large area, used for whole-body or larger part imaging.

Surface coils

Small MRI coils placed near the body part of interest, offering higher sensitivity for nearby tissues.

Phased Array coils

MRI coils combining smaller coils for high sensitivity and larger measurement areas.

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Transmit Only Coil

MRI coil used for transmitting radio waves only.

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Receive Only Coil

MRI coil used for receiving radio waves only.

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Transmit Receive Coil

MRI coil that performs both transmission and reception of radio waves.

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Circularly Polarized Coil

A type of volume coil that uses circularly polarized radio waves.

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Quadrature coil

A type of volume coil that receives two signals simultaneously allowing for improved image quality.

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Bird Cage Coil

A type of volume coil often used in MRI applications.

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Saddle Coil

A type of coil shape, often used in surface or volume MRI.

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Array Coil

A type of surface coil used for targeting specific body regions. Often contains multiple smaller coils.

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Study Notes

RF Coils in MRI

  • RF coils are crucial components affecting image quality in magnetic resonance imaging (MRI).
  • They transmit radiofrequency (RF) pulses and receive the RF signal.
  • RF coils can be classified into several types:
    • Transmit-only coils: These coils only transmit RF signals.
    • Receive-only coils: These coils only receive RF signals.
    • Transmit-receive coils: These coils both transmit and receive RF signals.

Types of RF Coils

  • Volume coils: Designed for uniform RF excitation across large volumes, suitable for whole-body imaging. Volume coils generally have better magnetic field homogeneity than surface coils. A larger body coil transmits the RF pulse while a smaller coil receives the signals.

    • Types of volume coils include: Circularly Polarized, Quadrature, Bird Cage, Crossed, Helmholtz Pair, Paired Saddle, Single Turn Solenoid (most coils today).
  • Surface coils: Simple coil design (loop of wire), placed over a specific region of interest on a patient for enhanced magnetic sensitivity. Surface coils typically have higher signal-to-noise ratios (SNR) for tissues close to the coil compared to those further away. They are used for regions like spines, shoulders, jaw joints, and smaller body parts.

    • Types of surface coils include: Array, Body Wrap Around, Linearly Polarized, Saddle.
  • Phased Array coils: Combine benefits of smaller coils (high signal-to-noise ratio) and larger coils (large measurement field). These often comprise multiple smaller coils that can be used individually or together for targeted areas of interest. Some phased array coils are coupled, isolated, and also include the patient couch as a coil.

  • Quadrature coils: Are commonly used volume coils. They use two loops of wire perpendicular to one another, producing more signal than single-loop coils.

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