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a detector that amplifies a signal (by as much as 106) of electromagnetic radiation by an acceleration of electrons released from a photocathode through a series of dynodes; as each electron strikes a dynode stage, 3-4 electrons are liberated and accelerated to the subsequent dynode.
In radiography, an electronic vacuum tube designed to convert light photons into electrical pulses. It is used to digitize incoming light photons prior to the creation of computerized images in nuclear medicine and other imaging modalities.
a hollow cylindrical organ or instrument.
one or more tubes inserted into the pleural space to provide relief from either pneumothorax or accumulations of fluid within the thoracic cavity and to allow for re-expansion of the lung.
a tube used in surgery to facilitate escape of fluids. See also drain (2).
a double-lumen tube inserted into the bronchus of one lung, permitting complete deflation of the other lung; used in anesthesia and thoracic surgery.
a U-shaped tube with one end closed, for determining gas production by bacteria. Called also Durham tube.
a gastroduodenal catheter of sufficiently small caliber to permit transnasal passage.
a feeding tube introduced through the nares and nasal cavity, then into the esophagus. Used in enteral feeding of dogs and cats.
see pharyngostomy intubation.
a vacuum tube that produces an electric current proportional to the intensity of light falling on its photocathode; it is sensitive enough to detect single photons.
tube rating chart
provided by the manufacturer and containing the specifications for the safe operating limits of the x-ray tube in terms of kilovolt peak, milliamps and time.
a flexible tube used for introducing food, medication, or other material directly into the stomach, or for removal of undesirable contents from the stomach. It can be passed into the stomach via the nose or mouth. Passage via the mouth requires the protection of a mouth speculum.
suction drainage tube
see suction drainage.
a tube of thin glass, closed at one end; used in chemical tests and other laboratory procedures.
one inserted through an opening in the chest wall for application of suction to the pleural cavity to facilitate re-expansion of the lung in spontaneous pneumothorax. See also chest tube (above).