The principle of ultrasonography is to bring out the image by the reflectancy obtained by high frequency ultrasonofraphic waves sent to the tissue by the ultrasonography machine. Breast, testis, prostate, thyroid, salivary glands, bladder, muscles, tendons, other soft tissues ,liver, pancreas, kidney, intestines,transvaginal, pelvic , surface, brain examinations before the fontanel tissue formation of the newborns, newborn hip dislocations may be done by this technique.
Arteries and veins in color can be examined noninvasively by this technique. It has a wide diagnostic range of atherosclerotic cases which are caused by the obstruction and narrowing of the arteries of the neck carrying blood to the brain, thus, causing infarcts and strokes. It also gives chance to diagnose the arterial and venous obstructions causing varicosis. It is also a very effective diagnostic tool for renal arterial defects, causing hypertension, aneuysms, pathologies related to eye vessels, inefficient erectile functions due to vascular causes and discriminating the benign and malign tumors.