This definition appears very rarely
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Acronym Finder has 2 verified definitions for ZEPI
Mohiaddin RH, Gatehouse D, Moon JC, Youssuffidin M, Yang GZ, Firmin DN, Pennell DJ. Assessment of reactive hyperaemia using real time zonal echo-planar flow imaging. J Cardiovasc Magn Reson. 2002;4(2):283-7. PubMed PMID: 12074143.