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What is the point of repeating TR signals in MRI

  1. Jun 1, 2010 #1
    What is the point of repeating the TR 90 degree pulse in MRI? I understand you must modify the TR time to get different T1 times, but since the echo signal is read, would'nt all the echo signals be read to the same intensity after a 90 degree pulse?
  2. jcsd
  3. Jun 3, 2010 #2
    Just a guess: you can improve the signal-to-noise ratio by averaging separate FFT results.
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