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If by echo time you mean echo spacing, that looks right to me. Peace, Matt. From: Dianne Patterson <[log in to unmask]> Reply-To: FSL - FMRIB's Software Library <[log in to unmask]> Date: Tuesday, April 9, 2013 2:11 PM To: <[log in to unmask]> Subject: [FSL] topup effective echo time calculation? I just want to check my calculations to make sure I have gotten a reasonable number back. Here's what I understand: Total readout time is the echo spacing (dwell time) times the number of phase encoding steps. If you use grappa, divide the number of phase encoding steps by the grappa factor. Here's what the tech and I calculated echo time 0.94 ms, phase encoding steps=128 (128*.00094)/2=0.06016 sec Is this correct? Thankyou, Dianne -- Dianne Patterson, Ph.D. Research Scientist [log in to unmask] <mailto:[log in to unmask]> University of Arizona Speech and Hearing Science 314 1131 E 2nd Street, Building #71 (Just East of Harvill) 621-9877 ============== If you write me (expecting an answer) and I don't respond within a day, then the email may have been lost. You can always write me at [log in to unmask] ==============