MRI Practice Questions and Answers with Complete Solutions

MRI Practice Questions and Answers with Complete Solutions What is the purpose of the RF coil in MRI? To transmit and receive radiofrequency signals for image formation Why must patients remain still during an MRI scan? Movement can cause image blurring and reduce scan quality What happens if a ferromagnetic object is brought near an MRI scanner? It can become a dangerous projectile due to the strong magnetic field Why is MRI considered a non-invasive imaging technique? It does not use ionizing radiation and does not require surgical procedures What is the role of gradient coils in MRI? They create variations in the magnetic field to encode spatial information 2 How does increasing the magnetic field strength affect image quality? It improves signal-to-noise ratio and enhances image resolution Why is it important to screen patients for implants before an MRI? Some implants may not be MRI-compatible and can pose safety risks What should a patient do if they feel discomfort during an MRI scan? Inform the technologist immediately using the emergency call button Why are contrast agents sometimes used in MRI? To enhance the visibility of certain tissues and abnormalities What is the function of the shim system in an MRI scanner? To improve magnetic field uniformity and reduce distortions Why is a Faraday cage used in MRI rooms? To block external radiofrequency interference and maintain image quality 3 How does an MRI scanner generate images of internal body structures? By detecting signals from hydrogen atoms in the body and processing them into images Why is patient positioning important in MRI? Proper positioning ensures accurate imaging of the targeted area What happens during a quench in an MRI system? The superconducting magnet loses its magnetic field due to helium release Why is hearing protection recommended during an MRI scan? The scanner produces loud noises that can affect hearing over time How does MRI differ from CT scans? MRI uses magnetic fields and radio waves, while CT scans use X-rays Why should patients with severe claustrophobia inform the technologist before an MRI scan? They may require sedation or alternative imaging methods 4 What is the function of the main magnet in an MRI scanner? To generate a strong and stable magnetic field for imaging Why are MRI contrast agents used with caution in patients with kidney disease? They can increase the risk of nephrogenic systemic fibrosis in some cases What should be done if a patient experiences an allergic reaction to contrast dye? Stop the scan and provide immediate medical assistance Why is temperature control important in the MRI suite? Extreme temperatures can affect patient comfort and system performance What is the role of the gradient amplifier in MRI? It controls the power supplied to the gradient coils for image encoding