Experimental: IVUS-guidance PCI

In the IVUS-guidance group, the optimal stent deployment criteria for non-left main lesion will include the following: : (1) the minimal lumen area (MLA) in the stented segment \> 5.0 mm\^2 or \> 90% of the MLA at the distal reference segments, (2) plaque burden 5 mm proximal or distal to the stent edge is \< 55%, and (3) absence of medial dissection over 3 mm in length. In the setting of a two-stent approach for distal left main bifurcation lesions, the optimal stent deployment criteria are an absolute minimal stent area (MSA) greater than 8 mm\^2 for the left main, greater than 7 mm\^2 for carina, greater than 6 mm\^2 for the ostial or proximal left anterior descending artery, and greater than 5 mm\^2 for the ostial or proximal left circumflex artery. For left main lesion treated with single-stent technique, the criteria are greater than 7mm\^2 for distal and greater than 8mm\^2 for proximal. Further treatment will be required if the criteria are not met.

Active_comparator: Angiography-guidance PCI

Angiographic success is defined as thrombolysis in myocardial infarction (TIMI) flow grade 3, and residual stenosis \< 20%.