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is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors.

It differs from broadcast television in that the signal is not openly transmitted, though it may employ point to point (P2P), point to multipoint (P2MP), or mesh wired or wireless links.

CT is very effective in looking at "static" areas, such as the brain, abdominal cavity, and extremities.

Most early CT scanners take 1-8 pictures (slices) a minute, much slower than the rate of the heart.

The only way to directly look at the coronary arteries was via a cardiac catheterization and coronary angiogram.

CT scans have been used to look at various anatomic regions, but have not been useful for the heart because the heart is continuously in motion.

Though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that may need monitoring such as bars, banks, casinos, schools, hotels, airports, hospitals, restaurants, military installations, convenience stores and other areas where security is needed.

In the past, noninvasive functional tests of the heart were used, such as treadmill tests and nuclear studies, to indirectly assess if there were blockages in the coronary arteries.More recently, decentralized IP cameras, some equipped with megapixel sensors, support recording directly to network-attached storage devices, or internal flash for completely stand-alone operation. the first commercial closed-circuit television system became available in 1949, called Vericon.There are about 350 million surveillance cameras worldwide as of 2016. The growth of CCTV has been slowing in recent years. Very little is known about Vericon except it was advertised as not requiring a government permit.Surveillance of the public using CCTV is common in many areas around the world.In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in law enforcement, with cameras located on a police officer's chest or head In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example when the environment is not suitable for humans.CCTV systems may operate continuously or only as required to monitor a particular event.