Myocardial perfusion imaging tests for 2 main things: ischemia and infarct.
If you have ischemia, it means there is poor blood flow to the heart at stress but not at rest. When you have this, your doctor may decide to intervene by dilating and/or stenting your coronary arteries. Your report says you do not have this.
If you have infarct, it means there is poor blood flow to heart during both rest and stress, probably due to old myocardial infarction (heart attack) resulting in scarred/damaged tissue. Your rep0rt says you have this.
What did your doctor say?