MRI Physics And Clinical Applications Practice Exam

Increasing TR results in which effect on scan time?

Lengthens Shortens No Effect on Scan Time Only Affects T1 Weighting

Correct Answer:

Lengthens

Explanation:

Increasing TR means each repetition takes longer, so the total acquisition time grows. Scan time is roughly TR multiplied by the number of repetitions (and other factors like phase-encoding steps and averages remain constant), so lengthening TR lengthens the overall scan time. It wouldn’t shorten it, and while TR also influences image contrast (T1 effects), the question focuses on timing, which shows the increase in scan time.

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