Dilated cardiomyopathy is a condition where there is a primary dysfunction of the heart muscle with normal coronary arteries. The heart muscle may be scarred from whatever condition caused the cardiomyopathy to occur, but a heart attack technically did not occur. Perfusion imaging studies identify areas of scar in the heart muscle that indicated dead heart muscle. These studies can show scar both in patients with ischemic and dilated cardiomyopathies, but only patients with ischemic cardiomyopathy will have had a heart attack from a blocked coronary artery that caused the scarring. I hope you find this information useful.
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