When considering heating potential, which set of parameters indicates the lowest risk?

The correct answer focuses on the relationship between the pulse sequence parameters and their influence on heating potential during an MRI procedure. In MRI, the risk of heating is closely tied to the repetition time (TR), pulse duration, and the flip angle utilized.

A higher TR allows for longer periods between successive RF (radiofrequency) pulse applications, which reduces the cumulative heating effect on the tissue. Similarly, a shorter pulse duration means that the time during which RF energy is delivered to the tissues is also minimized, reducing heat accumulation.

In this case, option D has the longest TR of 2000 milliseconds and the shortest pulse duration of 1 millisecond, paired with a lower flip angle of 100 degrees. This combination results in less energy being deposited into the tissue compared to higher TR values and longer pulse durations found in the other options, making it the safest choice in terms of heating potential. The lower flip angle also contributes to reduced energy absorption, further decreasing the risk of tissue heating.

Overall, the combination of a long repetition time, very short pulse duration, and a minimal flip angle provides an optimal balance that minimizes the risk of thermal injury during an MRI scan.