Also found in: Dictionary, Thesaurus, Medical, Financial, Acronyms, Encyclopedia, Wikipedia. contractor. n. 1) a person or entity that enters into a contract. 2) commonly, a person or entity that agrees to construct a building or to provide or install specialized portions of the construction.
Test Overview. Coronary calcium scans use a special X-ray test called computed tomography (CT) to check for the buildup of calcium in plaque on the walls of the arteries of the heart (coronary arteries). This test is used to check for heart disease in an early stage and to determine how severe it is. Coronary calcium scans are also called cardiac calcium scoring. The coronary arteries supply blood to the heart. Normally, the coronary arteries do not contain calcium. Calcium in the coronary arteries is a sign of coronary artery disease (CAD) . A CT scan takes pictures of the heart in thin sections. The pictures are recorded in a computer and can be saved for more study or printed out as photographs.
CT scanning also known as CT scan is a noninvasive, painless radiological test to evaluate many disorders of the brain. CT scan uses special x-ray equipment to produce multiple cross sectional images of the head- which are then analyzed by a computer and converted into a 3 dimensional picture. The CT scan is many times more sensitive then the plain x ray in imaging the brain. What conditions of the head can CT scan be used for? A head CT may be recommended if one has: