Penile Flow Doppler is a means of detecting data such as blood flow velocity and flow rate in the arteries and veins of the penis. Penile blood flow Doppler is a means of detecting data such as arterial and venous blood flow velocity and flow rate in the penis. It is based on the principle that color Doppler ultrasound detects the arteries and veins of the penis in the presence of an erection, and can be used to diagnose arterial or venous male erectile dysfunction (ED). Common parameters available from penile flow Doppler are: cavernous artery diameter, peak systolic velocity (PSV), end-diastolic velocity (EDV) and resistance index (RI). In order to identify the causes of erectile dysfunction (ED) in men, especially organic dysfunction, it is possible to visit a hospital in time to determine whether it is necessary to measure penile blood flow under the judgment of a medical professional.