Camera Control unitMonitoring Data Recording and storage

The camera control unit (CCU) receives and processes the image from the camera at the distal tip of the VE. The controls on the CCU are similar to those found on the proximal end of the VE, with additional exposure settings such as automatic gain control, which amplifies a dark image. The CCU prepares the image for export to a monitoring system

Figure 4.15 Various light sources used with portable endoscopy. The two light sources on the left are battery operated, increasing portability.

Figure 4.16 Top left—Camera control unit that processes the image for export. Center left— Back section of the camera control unit showing various image output ports. Bottom left— Hi8mm video camera used for visual monitoring and image recording. Top center—Mini DV recording deck with monitor (also capable of compact flash card image storage). Bottom center—Mini DV camera used to monitor and record images. Top right—Standard monitor. Bottom right—"Heads up" goggle-style monitor for use in tight places. Note the Hi8mm and MiniDV cameras have the added advantage of imaging through the lens.

Figure 4.16 Top left—Camera control unit that processes the image for export. Center left— Back section of the camera control unit showing various image output ports. Bottom left— Hi8mm video camera used for visual monitoring and image recording. Top center—Mini DV recording deck with monitor (also capable of compact flash card image storage). Bottom center—Mini DV camera used to monitor and record images. Top right—Standard monitor. Bottom right—"Heads up" goggle-style monitor for use in tight places. Note the Hi8mm and MiniDV cameras have the added advantage of imaging through the lens.

and the various image-storing devices. The image outputs available are standard video signals such as s-video and BNC outputs. This allows the CCU to send the image to a video monitor for operator observation during the procedure. Digital output allows the image to be sent to a digital recording device such as an optical disk or computer. If a mini digital video camera, equipped with an s-video line-in port and a monitoring screen, is used, it may function as both a monitor and an image storage device. Mini digital video cameras have great field applicability as they are compact and have the further advantage of being able to capture through-the-lens images of the research site, subject, and other project variables. Also available for image monitoring and image capture are miniDV recording decks and DVD recorders. The miniDV recording deck is similar to the miniDV camera but does not have through-the-lens capability since it does not have a lens for input. Figure 4.16 shows a portable CCU as well as a variety of monitors and recording devices. DVD recorders are limited in that additional monitoring must be considered. More recently, systems that can capture and store data on compact flash cards of varying memory capacities have been used. Also, resolution of the recorded and stored data has been improved by using HD imaging and recording systems. These systems are straightforward in their operational characteristics and provide added increased flexibility and quality to data collected from VE instrumentation.

Figure 4.17 Battery-powered "quick look" systems using LED light sources. Images can be recorded directly to compact flash card or exported via standard video output signals to additional monitoring and image recording systems.

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