MRI Week 4: Instrumentation of MRI Questions and Answers Latest Update Already Passed

MRI Week 4: Instrumentation of MRI Questions and Answers Latest Update Already Passed What is the primary function of the superconducting magnet in an MRI system? A. To generate the radiofrequency pulses B. To process imaging data C. To create a strong and stable magnetic field D. To reduce scan time Which component is responsible for transmitting radiofrequency pulses in an MRI scanner? A. Gradient coils B. RF coil C. Magnet bore D. Shim coil Why are shim coils used in an MRI system? A. To improve magnetic field homogeneity B. To enhance image resolution 2 C. To increase scan speed D. To cool down the magnet What is the main purpose of the gradient coils in an MRI scanner? A. To create spatial encoding of signals B. To increase signal strength C. To produce the main magnetic field D. To prevent signal distortion Which part of the MRI system receives signals from the patient's body? A. RF coil B. Magnet bore C. Gradient amplifier D. Shim coil Why is cryogen used in MRI systems? A. To prevent radiofrequency interference B. To keep the superconducting magnet at an ultra-low temperature 3 C. To improve patient comfort D. To enhance image contrast What happens when the gradient coils are activated during an MRI scan? A. They create variations in the magnetic field to encode spatial information B. They increase the strength of the main magnetic field C. They cool down the superconducting magnet D. They reduce scan artifacts Which factor primarily determines the strength of the MRI magnet? A. The number of RF coils B. The power of the gradient amplifier C. The amount of current in the superconducting wire D. The size of the scanner bore Why do MRI scanners have a Faraday cage around them? A. To protect the patient from radiation B. To prevent external radiofrequency interference 4 C. To increase the speed of image processing D. To enhance contrast resolution Which type of magnet is most commonly used in modern MRI scanners? A. Permanent magnet