The thyroid is a relatively small organ, lying against and around the larynx and trachea. Female thyroid glands weigh up to 18 g, male ones up to 25 g.
The parathyroid glands are two pairs of glands having the size of apple seeds usually positioned behind the left and right lobes of the thyroid
The skeletal scintigraphy or bone scan is the most sensitive method for the presentation of bone metabolism.
With myocardial scintigraphy the perfusion (blood flow) of the heart can be measured at rest and during exercise by the use of radioactively marked substances.