acquisition time for a DWI sequence

[gautam]

Hi Everyone,
Second try, since I did not see my earlier post on the same topic appear in the forum.
I had asked about the technique for expressing the acquisition time of a SS EPI DWI sequence in terms of the parameters of the protocol, like TR, TE, #directions and b etc. I was wondering if
someone can guide me through the process?
Also, what is the strategy for estimating SAR for a specific sequence. Currently, I think that it is directly proportional to 1) number of RF excitations 2) amplitudes of the RFs and 3) strength of various gradients utilized in the sequence, all combined and divided by the total acquisition time, and the weight of the subject. Well, this is a deposition of energy, but it does establish an upper limit.
Would be nice to hear your thoughts on this.
Thanks,
G