How Long Does a DWI Sequence Really Take?

Diffusion-weighted imaging acquisition time depends primarily on TR, the number of signal averages, and the number of b-value directions. A conventional single-shot EPI DWI of the brain can be acquired in less than one minute. Longer scan times yield higher signal-to-noise ratio.

• Educational summary explains that DWI acquisition time = TR × number of excitations × number of diffusion directions.
• Article is a general teaching resource on MRI physics, not a new study or clinical guideline.

RadPigeon summaries are original and for information only. They are not clinical advice.