Doppler (Both Artery + Vein)
Doppler ultrasonography is a specialized, non-invasive imaging technique used to evaluate blood flow through the body’s major arteries and veins. By utilizing the Doppler shift principle—where sound waves change frequency when bouncing off moving red blood cells—it allows clinicians to assess blood velocity, direction, and flow dynamics in real time.
Vascular Doppler studies are broadly split into two distinct categories:
- Arterial Doppler Ultrasound: Focuses on high-pressure vessels carrying oxygenated blood away from the heart. It relies on Color Doppler to visualize flow profiles and Spectral Doppler to map distinct cardiac waveforms. In a healthy artery, a sharp, multi-phasic waveform indicates strong peripheral resistance. Clinicians use it to detect atherosclerotic plaques, arterial narrowing (stenosis), peripheral artery disease (PAD), or life-threatening aneurysms.
- Venous Doppler Ultrasound: Evaluates low-pressure vessels returning deoxygenated blood back to the heart. Normal venous flow is phasic, shifting gently with the patient's breathing cycle. A primary use case is the compression ultrasound protocol to diagnose Deep Vein Thrombosis (DVT)—a blood clot that prevents the vein from collapsing under probe pressure. It also maps faulty venous valves responsible for chronic venous insufficiency and varicose veins.
Additionally, Power Doppleroffers enhanced sensitivity for mapping very slow, low-velocity blood flow in small capillaries, which is ideal for evaluating tissue perfusion or tumor vascularity. Ultimately, Doppler ultrasound provides a safe, radiation-free path for diagnosing circulatory disorders and mapping vascular anatomy.
