MRI Registry Review Questions and Answers with Certified Solutions

MRI Registry Review Questions and Answers with Certified Solutions Why does increasing matrix size improve spatial resolution? It increases the number of pixels, making the image sharper What is the purpose of k-space in MRI imaging? It stores raw data before image reconstruction Why is parallel imaging used in MRI? To reduce scan time while maintaining image quality What effect does a longer repetition time (TR) have on T1 contrast? It reduces T1 contrast by allowing more full relaxation of tissues Why is functional MRI (fMRI) useful in brain imaging? It detects changes in blood flow related to neural activity 2 How does time-of-flight (TOF) MR angiography visualize blood vessels? It relies on flow-related signal differences in moving blood What is the advantage of using a higher receiver bandwidth? It reduces chemical shift artifacts and shortens scan time Why is field of view (FOV) important in MRI imaging? It determines the area covered in the image and affects resolution What is the main cause of chemical shift artifacts? Differences in resonance frequencies between fat and water Why is echo-planar imaging (EPI) used for rapid imaging? It captures an entire image in a single RF excitation How does susceptibility-weighted imaging (SWI) improve detection of microbleeds? It enhances contrast based on magnetic susceptibility differences 3 What is the primary function of the superconducting magnet in an MRI scanner? To generate a strong and stable magnetic field Why is it important to screen patients for metallic implants before an MRI scan? To prevent movement or heating of the implant due to the magnetic field What role do gradient coils play in MRI imaging? They create spatial variations in the magnetic field to allow image localization How does increasing the field strength affect signal-to-noise ratio (SNR) in MRI? Higher field strength increases SNR, improving image quality What is the purpose of the RF coil in MRI? To transmit and receive radiofrequency signals for image formation Why is gadolinium-based contrast used in MRI? It enhances the differences between normal and abnormal tissues 4 What happens if a patient moves during an MRI scan? Motion artifacts may appear, reducing image clarity Why is fat suppression used in MRI imaging? To eliminate fat signal and improve contrast between different tissues What is the main advantage of using a fast spin-echo (FSE) sequence? It reduces scan time while maintaining image quality