acquisition time for a DWI sequence

[Melvinchunter]

The time of acquisition for a conventional twist echo or gradient echo sequence is the result of the reiteration time, stage encoding steps, and number of midpoints. 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.