by Karl Loren
Coronary Artery Scanning (CAS) uses Electron Beam Tomography and a simple protocol which permits imaging of the native vessels in a single breath-hold without any injection of contrast. CAS has the unique ability to detect and quantify minute amounts of calcified plaque in the major coronary arteries.
[Karl Loren Note: The above statement is NOT true. This device cannot detect the difference between calcium buildup outside the cells, as for instance, on the inside of the artery wall, and calcium which is INSIDE individual cells -- cells, for instance, that might be within the normal area of the wall of the artery.
CAS is the most sensitive, non-invasive method currently available to detect the presence and extent of early atherosclerosis. Numerous studies have concluded that coronary artery calcium is a marker for atherosclerosis, a condition recognized as the leading cause of coronary artery disease. While traditional risk factor tests can suggest a probability of atherosclerosis, they cannot determine whether the disease is, in fact, present. Thus, CAS is an important addition to traditional methods of coronary artery disease risk assessment.
Electron Beam Tomography (EBT) is an innovative outgrowth of Computed Tomography (CT) technology specifically developed to image fast enough to freeze the beating heart. Instead of a mechanically rotating x-ray tube, an electromagnetically-steered and precisely focused beam of electrons is scanned around a tungsten target. The resultant collimated fan of x-ray photons is rotated to provide scans in 1/10 or 1/20 second, an order of magnitude faster than conventional CT scanners.
Heart disease and heart attacks are caused by a process called atherosclerosis,
often referred to as "hardening of the arteries." This process
involves the deposit of cholesterol in the walls of blood vessels, causing areas
called "plaques," which over time gradually build up to form blockages
which can cause heart attacks. This process occurs in almost everyone and often
starts early, even in the teen years. It usually takes many years before the
plaques are large enough to actually cause a problem. However, if we could
detect plaques in people before they cause a problem, we could try to prevent
them from getting larger. Ultrafast CT scanning is a new method that allows us
to detect the presence of plaque before it has caused a problem.
How is this possible? Plaques often contain calcification, a bone-like substance that can be seen by specialized type of x-rays. This has nothing to do with the calcium in your blood, but is important because it is a marker for plaque in the blood vessel. Calcification is not normally present, so when we see it we know that plaque must be present. Ultrafast CT scanner is a specially designed instrument that can detect even very small amounts of calcification in the coronary arteries, the blood vessels that supply blood to the heart muscle. Therefore, it is a new method to detect heart plaque even in people who have no symptoms of heart disease. By doing this, it may allow the detection of people who are at higher than average risk for developing heart attacks in the future.
© 1996, IMATRON, Inc.
More Information About Imatron's
EBCT Scanner and UltraFast CT® Electron Beam Tomography
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