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Figure 2 (A) Diagram of radiation-sensitive intravascular catheter (as depicted in U.S. patent 6,782,289 by Strauss [16]). The lesion in the vessel is labeled "Lesion." (B) A photograph of the prototype catheter, undergoing testing with a small beta radiation source. The catheter connects to a phototube in a lightproof housing, which changes the individual light pulses to an electrical signal for display on the readout. The catheter position is determined by localizing the radio-opaque tip, which is superimposed on the coronary arteriogram. The radiation intensity is displayed as a false color signal on the arteriogram. I = catheter sheath; II = vessel wall; III = vessel lumen; IV = optical fiber (to conduct light from the scintillator); V = connection between scintillator and optical fiber; VI = plastic scintillator.