Diagnostic ultrasound is an established method of diagnostic medical imaging using a high-frequency sound wave and the principle of sonar to create an image. It is a reliable, cost-effective means of evaluating many internal organs, including the liver, pancreas, spleen, kidneys, aorta, gallbladder, ovaries, uterus, prostate, testicles, and thyroid. It is routinely used to evaluate fetal growth and complications of pregnancy.