A simple method for interpreting and reviewing the anatomy of the coronary arteries as seen on angiograms uses the concept of two imaginary circles around the interventricular and atrioventricular grooves, respectively. The hands and fingers of the viewer are used to represent the various cardiac structures so that the anatomic location of vessels in various angiographic projections may be properly understood.
(JAMA 243:252-254, 1980)
Sos TA, Kligfield PD, Sniderman KW. A Method for Understanding Three-dimensional Coronary Anatomy. JAMA. 1980;243(3):252–254. doi:10.1001/jama.1980.03300290034017