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Comparison of heart/liver (a) and heart/lung (b) ratios for 99mTcN-MPO and 99mTc-Sestamibi in normal dogs. Both tracers had good heart/lung contrast. The heart/liver ratio of 99mTcN-MPO increased rapidly over the 2 h study period, whereas the heart/liver ratio of 99mTc-Sestambi improved only slightly with time (single number sign P>0.05;asterisk P<0.05).
