MRI Registry Review Questions and Answers Graded A+

MRI Registry Review Questions and Answers Graded A+ Why are low flip angles used in gradient echo sequences? To maintain steady-state signal and reduce scan time What is the function of a quadrature coil in MRI? To improve signal reception from multiple orientations How does increasing TR affect SNR? It allows more signal recovery, improving SNR What is the purpose of respiratory gating in MRI? To reduce motion artifacts from breathing How does aliasing occur in MRI? When signals outside the field of view are misinterpreted 2 Why does increasing slice thickness improve SNR? Because more protons contribute to the signal How does cardiac gating help in MRI? It synchronizes imaging with the heartbeat to reduce motion artifacts What is the role of bandwidth in MRI? It affects SNR and susceptibility to artifacts Why is T2 contrast useful in MRI pathology? It highlights fluid-filled abnormalities like edema How does increasing phase encoding steps affect scan time? It increases resolution but lengthens scan time What is the significance of relaxation times in MRI? They determine tissue contrast and imaging characteristics 3 How does gradient strength affect spatial encoding? Stronger gradients improve spatial resolution What is the function of a saturation pulse in MRI? To suppress unwanted tissue signals What is the primary role of the main magnetic field in MRI? To align hydrogen protons in the body Why is a radiofrequency (RF) pulse applied during an MRI scan? To excite hydrogen protons and produce a measurable signal What determines the contrast in T1-weighted imaging? The difference in T1 relaxation times of tissues How does T2-weighted imaging highlight fluid-filled structures? By emphasizing tissues with longer T2 relaxation times 4 Why is repetition time (TR) important in MRI? It controls the timing of RF pulses and affects tissue contrast What happens to signal-to-noise ratio (SNR) when the magnetic