During an ultrasound examination of the thyroid gland, the radiologist places a special head emitting ultrasound waves on the front part of the neck. This test is non-invasive and may be repeated many times in children and pregnant women. Thyroid ultrasound is based on the imaging of the thyroid gland and adjacent tissues along with the lymph nodes in the neck. Ultrasound of the thyroid gland allows for an objective measurement of the volume of the thyroid gland and the identification of enlarged thyroid gland (the so-called goiter). Ultrasound also allows you to determine the location and size of any nodules on the thyroid gland. The morphological features of the nodules visualized on ultrasound along with the clinical picture may determine the need for a thyroid biopsy.