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A high frequency sound wave (ultrasound) is used to check the condition of the penile
arteries. Ultrasound is used to evaluate blood flow, venous leaks,
signs of atherosclerosis, and scarring or calcification of the erectile tissue.

Another test is observing the response to drugs that normally stimulate an erection when injected into the penis.
Erection is induced by injecting prostaglandin, a hormone-like stimulator produced
in the body. Ultrasound is then used to see vascular dilatation and measure the penile pressure, which may also
be measured with a special cuff. Measurements are compared to those taken when the penis is flaccid. where to buy cialis