text: <unk>  <unk>  is a medical imaging methodology using a specially designed catheter with a miniaturized<unk>  probe attached to the distal end the catheter.  The proximal end of the catheter is attached to computerized<unk>  equipment. It allows the application of<unk>  technology to see from inside blood vessels out through the surrounding blood column, visualizing the endothelium (inner wall) of blood vessels in living individuals.
option_0: Intravascular ultrasound
option_1: Lopressor injection
option_2: Invasive hemodynamic monitoring
option_3: Angiogram
option_4: Tourniquet test
option_5: Cardiotocography
option_6: Venography
option_7: CT angiography