infarct size was determined by planimetry of tetrazolium-stained slices while the area at risk of infarction ( hypoperfused zone ) was determined by planimetry of the `` '' cold spots '' '' on autoradiograms of the slices that contained 99m tc-labeled microspheres that had been injected 1 min after occlusion .
C0021308
infarction
C0022116
hypoperfused