Coronary microcirculation is not usually the object of routine imaging however, being the major determinant of vascular resistance - 80% of total resistance is due to coronary microcirculation - its dysfunction may compromise myocardial perfusion. Indeed, the coronary pre-arterioles and arterioles - i.e. the coronary arteries <500 μm in diameter, physiologically modulate coronary blood flow (CBF) in response to neural, mechanical and metabolic factors.
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