Figure 1

Matched representative SAX images from swine without hemorrhage after 1 hr LAD occlusion (Case #1) (a-d) and with hemorrhage after a 2 hr occlusion (Case #2) (e-h). In Case #1, significant T₁ and T₂ elevation are present in both maps (c,d), though no MVO was observed with EGE (b) nor was a hypointense core present in T₂W images (a). In comparison, Case #2 shows clear IMH, demarked by decrease in T₁ and T₂, surrounded by edema, shown by increased T₁ and T₂ (g and h), all of which are excellently co-localized with that in T₂W (e) and EGE (f). Green arrowhead indicates edema; red arrowhead indicates the core of IMH. Note that T₁ mapping is influenced by off-resonance and lower image resolution. As the result of competing effects on T₁ and T₂ from IMH and edema, partial volume averaging makes the T₂ in IMH close to that of normal myocardium.