Illumination is provided by an external source: - correct answer either by a xenon arc, or a halogen-filled tungsten filament lamp.
Flexible scopes are designed to view - correct answer the lumen either in a front or side viewing manner.
The front viewing scope is most commonly used - correct...
Illumination is provided by an external source: - correct answer either by a xenon arc, or a halogen-filled
tungsten filament lamp.
Flexible scopes are designed to view - correct answer the lumen either in a front or side viewing manner.
The front viewing scope is most commonly used - correct answer in endoscopic procedures.
The side viewing scope allows for - correct answer optimal evaluation of and access to certain lesions in
the stomach and the duodenum.
The side viewing scope is most commonly utilized - correct answer when performing biliary and
pancreatic ductal imaging through the ampulla of Vater.
Fiber optic endoscopes are based on fiber optic light transmission technology. Light is conveyed through
- correct answer two bundles of fine glass fibers, each smaller than a human hair (8 to 10 µm in
diameter), packed tightly together in the shaft of the scope. One bundle of fibers carries light into the
examined organ, and a second bundle transmits the image from the organ to the viewing optic. The
latter bundle must have all the fibers arranged in a coherent bundle. This method of bundling produces
the image on the monitor in its correct orientation.
Each fiber is clad in a wrapping of higher optical density, creating a reflective layer that causes light to
bounce back and forth within the fiber. This configuration allows for minimal light loss. Although the
cladding does not transmit light, it does appear - correct answer as a dark rim around the portion of the
image transmitted by the fiber, giving images seen through a fiber optic endoscope a newsprint-like
quality.
Fiber optic endoscopes are generally - correct answer direct-viewing, meaning the endoscopist looks
directly into an eyepiece. An optical beam splitter allows a second observer to view the image through a
separate eyepiece.
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