Podcast
Questions and Answers
What is the primary function of RF coils in MRI?
What is the primary function of RF coils in MRI?
Which coil type is specifically categorized as a 'Receive Only Coil'?
Which coil type is specifically categorized as a 'Receive Only Coil'?
What advantage do surface coils have over other types of RF coils?
What advantage do surface coils have over other types of RF coils?
Which of the following is NOT a type of volume coil?
Which of the following is NOT a type of volume coil?
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What distinguishes phrased array coils from volume coils?
What distinguishes phrased array coils from volume coils?
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Which type of coil is typically used for full-body imaging?
Which type of coil is typically used for full-body imaging?
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Why are surface coils less sensitive to tissues farther from the coil?
Why are surface coils less sensitive to tissues farther from the coil?
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Which is a characteristic of volume coils compared to surface coils?
Which is a characteristic of volume coils compared to surface coils?
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Study Notes
RF Coils
- RF coils are crucial components affecting MRI image quality.
- They transmit RF pulses and receive RF signals.
- Some systems have separate transmitter and receiver coils, while others have a transceiver coil acting as both.
- RF coils are categorized into:
- Transmit Only: Transmit signals only.
- Receive Only: Receive signals only.
- Transmit Receive: Transmit and receive signals.
RF Coil Types
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Volume coils: Designed for homogenous RF excitation across large areas, suitable for full-body scans. Their magnetic field homogeneity is better than surface coils. The body coil acts as the transmitter while a smaller coil acts as the receiver.
- Types include: Circularly Polarized Coil, Quadrature coil, Bird Cage Coil, Helmholtz Pair Coil, Paired Saddle Coil, Single Turn Solenoid.
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Surface coils: Simple loop designs, typically circular or rectangular, positioned over areas of interest for enhanced magnetic sensitivity. Higher signal-to-noise ratio (SNR) for tissues near the coil. Less sensitive to tissues further away.
- Used for specific regions: spines, shoulders, jaw joints, etc.
- Types include: Array Coil, Body Wrap Around Coil, Linearly Polarized Coil, Saddle Coil.
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Phased Array coils: Combine smaller coils' high SNR with larger coils' larger fields of view. Multiple smaller coils can be used, individually or together. Even the patient couch can sometimes be part of the arrangement.
- Types include: coupled array coils, isolated array coils, phased array coils.
Additional details
- Quadrature/Circularly polarized coils: Have multiple loops of wire at right angles, producing a stronger signal than single-loop coils. Often used as volume coils.
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Description
This quiz covers the essential role of RF coils in MRI imaging, including their types and functionalities. Participants will learn about volume coils and surface coils, as well as the differences between transmit and receive mechanisms. Test your knowledge on how these components impact image quality in MRI systems.
