DCB vs DES for Severe Coronary Calcification After Optimal Modification Assessed by QFR

Inclusion Criteria: * Age ≥ 18 years * Moderate to severe calcified lesions assessed by coronary angiography * In situ coronary artery calcification * Target lesion with indications for coronary intervention * Target lesion vessel diameter ≥ 2.25 mm and ≤ 4.0 mm * Calcification modification treatment performed using rotational atherectomy, intravascular lithotripsy (IVL), or excimer laser coronary angioplasty (ELCA). * QFR \> 0.8 after calcification modification Exclusion Criteria: * Patients with ST-segment elevation myocardial infarction: * Patients with renal failure requiring dialysis or currently undergoing dialysis. * Patients whose coronary angiography quality is unsuitable for QFR analysis. * Patients with in-stent restenosis. ⑤ Patients with other medical conditions and a life expectancy of \<1 year. ⑥ Patients scheduled for surgery within 6 months post-procedure, and whose surgery would interfere with continued use of antiplatelet therapy. ⑦ Patients who cannot tolerate dual antiplatelet therapy. ⑧ Patients who cannot adhere to the protocol-required follow-up, or whose participation in the trial is deemed risky by the investigator. ⑨ Patients who cannot provide written informed consent or cannot follow the trial protocol. ⑩ Patients currently participating in another clinical trial for coronary interventional devices.