acquisition time for a DWI sequence

[aelster]

Dear Gautam,

Concerning DWI acquisition times, it depends on the particular sequence used, so there is no general formula. For single-shot EPI acquisition during a single TR interval one shot corresponds to a single direction and single b-value. The TE is irrelevant. Thus the acquisition time is proportional to the number of slices, number of signals averaged, number of directions chosen, number of b-values desired, and TR. If parallel imaging is used, the acquisition time is reduced by the R-factor.

Concerning SAR, I will be opening up an entire Q&A section on this in the near future, and the topic is too complex to be covered in the forum. So you'll have to wait for now, or find your answer elsewhere.

Thank you for your questions.

Allen Elster