Anatomy and segmentation of coronary arteries: The coronary arteries are divided into left and right branches, and their openings are located in the left and right coronary sinuses, and the left coronary artery is divided into left main trunk (LM), left anterior descending branch (LAD), and gyral branch (CX). The left main trunk is a trunk of about 1 to 3 cm in length emanating from the root of the aorta, and the left anterior descending branch travels in the interventricular sulcus and is divided into three segments: the proximal segment (LAD1) is from the end of the left main trunk, i.e., the beginning of the anterior descending branch, to the first diagonal branch (D1) or interval branch, the middle segment (LAD2) is from the first diagonal branch to the corner of the anterior descending artery, and the distal segment (LAD3) is below the corner of the anterior descending artery; the gyrus The right coronary artery (RCA) trunk travels in the left atrioventricular sulcus and is divided into two segments: the proximal segment (CX1) from the opening to the first obtuse marginal branch, and the distal segment (CX2) from the first obtuse marginal branch to the end of the gyral branch artery. RCA2) is from the emanation of the first right ventricular branch to the emanation of the acute marginal branch (AMB) (exactly at the second bend of the right coronary artery, on the acute margin of the right ventricle), and the distal segment (RCA3) is from the emanation of the acute marginal branch to the posterior descending branch. Coronary artery branches are highly variable, with the left coronary artery having a septal branch, a first diagonal branch (D1) or intermediate branch, a second diagonal branch (D2), a third diagonal branch (D3), and a first obtuse marginal branch (OM1), a second obtuse marginal branch (OM2), and a third obtuse marginal branch (OM3). The right coronary artery branches are conical branch (C), right atrial branch (RAB), first right ventricular branch (RVB1), second right ventricular branch (RVB2), third right ventricular branch (RVB3), acute marginal branch (AMB), posterior left ventricular branch (PLVB), and posterior descending branch (PDA).