Acquisition time

Last revised by Henry Knipe on 14 Mar 2024

The time of acquisition for a conventional spin echo or gradient echo sequence is the product of the repetition time, phase encoding steps, and number of averages (TR x phase steps x NEX).

For example, with a one-second TR, 128 phase steps, and two averages, we would get an acquisition time of about 1 x 128 x 2 = 256 seconds, or 4 minutes and 16 seconds. The actual time will be slightly longer. 

Fast spin echo and fast gradient echo sequences perform more than one phase encoding step per repetition time, reducing acquisition time by the number of phase steps per repetition time.

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