Googling the coronary: fiberoptics and a computer provide the answers.
Muller
James E
JE
Dixon
Simon R
SR
D006328:Cardiac Catheterization; D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000473:pathology*; D003331:Coronary Vessels / Q000473:pathology*; D005336:Fiber Optic Technology / Q000295:instrumentation*; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D021621:Imaging, Three-Dimensional; D055806:Microvessels / Q000473:pathology; D041623:Tomography, Optical Coherence / Q000295:instrumentation*; D014584:User-Computer Interface