Inclusion Criteria:  age ≥ 18 years Treatment for de novo, densely calcified femoral popliteal arteries with 70-100% stenosis as measured by IVUS. Lesion lengths up to 140 mm. Planned follow-up within the health clinic.  Exclusion Criteria:  Calcified femoral popliteal arteries that show <70% stenosis by angiography. Calcified femoral popliteal arteries with 100% stenosis in which the lesion cannot be crossed after pre-dilation with a 2-3mm balloon. Unable or unwilling to provide informed consent, including but not limited to cognitive or language barriers (reading or comprehension). Thrombophlebitis or deep venous thrombus, within the previous 30 days. Evidence of end stage renal disease (ESRD) or stage 5 chronic kidney disease (CKD). Currently receiving treatment in an investigational device or drug study or anticipate participating in an investigational device or drug study for the duration of this study. Anticipated life expectancy less than 6 months. Lack of phone or email for contact.