Podcast
Questions and Answers
What is the main function of RF coils in MRI?
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?
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?
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?
What characteristic differentiates phased array coils from other RF coil types?
Which of the following is NOT a type of volume coil?
Which of the following is NOT a type of volume coil?
Why are surface coils less sensitive to tissues that are far from them?
Why are surface coils less sensitive to tissues that are far from them?
Which configuration is common in quadrature coils?
Which configuration is common in quadrature coils?
Which statement accurately describes the function of transceiver coils?
Which statement accurately describes the function of transceiver coils?
Flashcards
RF coils
RF coils
Components in MRI that transmit radio waves and receive signals, affecting image quality.
Volume coils
Volume coils
MRI coils designed to cover a large area, used for whole-body or larger part imaging.
Surface coils
Surface coils
Small MRI coils placed near the body part of interest, offering higher sensitivity for nearby tissues.
Phased Array coils
Phased Array coils
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Transmit Only Coil
Transmit Only Coil
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Receive Only Coil
Receive Only Coil
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Transmit Receive Coil
Transmit Receive Coil
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Circularly Polarized Coil
Circularly Polarized Coil
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Quadrature coil
Quadrature coil
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Bird Cage Coil
Bird Cage Coil
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Saddle Coil
Saddle Coil
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Array Coil
Array Coil
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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
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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).
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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.
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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.
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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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