Determination of Optimal Fluoroscopic Angulations for Left Main Coronary Artery Ostial Interventions: 3-Dimensional Computed Tomography Validation

Figure 2

Optimal projection to visualize the LMCA ostium estimated by FluoroCT: (a) the aortic annulus (yellow line) and LMCA plane (blue line) were determined; and (b) the optimal projection of the LMCA ostium was fixed when two S-curves consisting of an unlimited number of pairs of C-arm angulations which were tangential to the aortic annulus and the LMCA ostium crossed. LAO = left anterior oblique; RAO = right anterior oblique; CRA = cranial; CAU = caudal.