Ultrasonography or computed tomography often shows an immobile, enlarged gallbladder. Sonography (ultrasonography) is widely used in medicine. Duplex ultrasonography and angiography may also be used. Biliary sludge is typically diagnosed by CT scan or transabdominal ultrasonography. Ovarian function may be measured by gynecologic ultrasonography of follicular volume. Doppler ultrasonography is widely used in renal ultrasonography. Patients with abnormal MSAFP need to undergo detailed obstetric ultrasonography. Portal vein pulsatility can be measured by doppler ultrasonography. People with varicose veins should now be investigated using lower limbs venous ultrasonography. Cryopreservation of semen, artificial insemination, ultrasonography and endoscopy of equines is routinely carried out here. Imaging by ultrasonography, MRCP, or CT scan usually make the diagnosis. Lymphangiomas are commonly diagnosed before birth using fetal ultrasonography. With color Doppler ultrasonography, the vascularity of the undescended testis is poor. RAS is typically diagnosed with duplex ultrasonography of the renal arteries. More exact measurements can be performed with obstetric ultrasonography.