Final answer:
Increasing the flip angle in MRI typically results in longer scan times due to the need for longer repetition times (TR) to allow for adequate spin relaxation between signals, which in turn can enhance image contrast.
Step-by-step explanation:
When discussing how increasing the flip angle impacts scan time in medical imaging, particularly in the context of Magnetic Resonance Imaging (MRI), it's important to understand the basics of MRI technology. The flip angle is the measure of the angle between the longitudinal magnetization and the plane to which the net magnetization is tipped at the application of an RF pulse.
Increasing the flip angle generally requires a longer repetition time (TR) to allow the spins to sufficiently relax and return to equilibrium before the next pulse. However, increasing the flip angle can also result in stronger signal as more net magnetization is tipped into the transverse plane, which can enhance image contrast. Yet, longer TRs as a consequence of larger flip angles directly result in longer scan times. Thus, in adjusting the flip angle, a balance must be struck between image contrast and scan time. A larger flip angle often means a longer scan time, which could affect patient comfort and throughput in a clinical setting.