2decho is ultrasound of your heart where doctor looks at the heart function in resting condition Stress echo is to check the heart function in stressful condition.in this doctor does and echo of heart in resting condition and again after doing some exercise on TMT. Coronary angiography is a invasive procedure which is done as a day care procedure where the doctor puts a line or access in your radial artery in hand under local anesthesia and passing through that take pictures of the heart arteries where u keep lying down on a table with machine just like CT scan.