Doppler ultrasonography is used to assess for pathological conditions in the lower extremities such as peripheral vascular disease, deep vein thrombosis, stenosis or varicose veins. The patient lies supine. The examiner should use transmission gel before placement of the transducer. To assess for the Dorsalis Pedis artery, the examiner uses the transducer to trace from the anterior ankle to the dorsal foot between the first and second metatarsals. To assess for the Posterior Tibial artery, the examiner can trace along from the posterior medial calf distally to behind the medial malleolus of the ankle, or start from the medial malleolus proximally to the posterior medial calf. To assess for the Peripheral Peroneal artery, trace along the posterior lateral calf alongside the fibula. You are trying to listen if the arterial pulses are monophasic, biphasic, or triphasic.
Hwang JY. Doppler ultrasonography of the lower extremity arteries: anatomy and scanning guidelines. Ultrasonography. 2017 Apr;36(2):111-119. doi: 10.14366/usg.16054. Epub 2017 Jan 18. PMID: 28219004; PMCID: PMC5381852.