Fig. 6

Myocardial signal intensity-time curves and CNR maps. a, b Example myocardial signal intensity vs. time curves at (a) low and (b) high dose. The curves show the mean signal from three different slices. c, d Voxel-wise myocardial contrast-to-noise ratio (CNR) maps for eight segmented slices between apex and base. CNR maps were oriented as indicated (inset). Slice numbers in (a, b) correspond to those in (c, d). High dose data shows more pronounced contrast enhancement and higher CNR values than low dose data. Mean CNR and standard deviations were 2.02 ± 0.88 and 5.23 ± 0.97 for low and high dose, respectively