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I do mean echo spacing, thankyou! -Dianne On Tue, Apr 9, 2013 at 12:43 PM, Matt Glasser <[log in to unmask]> wrote: > 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] <[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] > ============== > -- Dianne Patterson, Ph.D. Research Scientist [log in to unmask] <[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] ==============