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Questions and Answers
What is the primary purpose of a volume coil design?
Why are volume coils less ideal for small regions of interest?
What is a common application of volume coils in clinical settings?
Why are surface coils preferred for high-resolution imaging?
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How are surface coils typically positioned in MRI?
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Why are volume coils often driven in quadrature?
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What is a disadvantage of surface coils mentioned in the text?
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What is the advantage of using a quadrature coil design?
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What is the purpose of using phased array coils in MRI systems?
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Why are MRI scanners placed in Faraday cages?
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What is the main function of the Radio Frequency (RF) chain in an MRI system?
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Study Notes
Volume Coil Design
- Primary purpose is to provide uniform radiofrequency (RF) field distribution for imaging larger volumes.
- Less ideal for small regions of interest due to decreased sensitivity and signal strength compared to more localized coils.
Clinical Applications
- Commonly used in clinical settings for whole-body imaging, such as in MRI scans of the abdomen or brain.
Surface Coils
- Preferred for high-resolution imaging as they offer enhanced signal-to-noise ratio (SNR) in small regions, allowing for clearer images.
- Typically positioned directly against or close to the area of interest, maximizing sensitivity while minimizing noise from surrounding tissues.
Quadrature Coils
- Volume coils are often driven in quadrature to improve sensitivity and efficiency in signal detection by utilizing two channels of RF reception that are 90 degrees out of phase.
- Advantage of quadrature coil design is the improved overall signal reception, leading to better image quality.
Phased Array Coils
- Purpose is to utilize multiple surface coils to cover a larger field of view, providing both high resolution and increased coverage, reducing scan times.
Faraday Cages
- MRI scanners are housed in Faraday cages to prevent external electromagnetic interference which could disrupt imaging quality.
RF Chain Functionality
- The main function of the Radio Frequency (RF) chain in an MRI system is to transmit RF pulses to excite hydrogen nuclei within the body and to receive the resulting signals for image reconstruction.
Surface Coils Disadvantage
- A noted disadvantage of surface coils is their limited coverage, which may require multiple coils to cover larger anatomical areas.
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Description
Learn about the design and characteristics of volume RF coils used in magnetic resonance imaging. Understand their advantages and limitations for transmitting and receiving RF signals in the body.
