with a heart phantom in a chest phantom , ti-201 activities simulating `` '' normal myocardium , '' '' `` '' ischemia , '' '' `` '' infarction , '' '' and `` '' background '' '' were placed in object contrast ratios ( with respect to background ) of 5.0 , 2.0 , and -1.0 , respectively .
C0018787
heart
C0027061
myocardiu