Endoscopic Equipment & Instrumentation Flashcards
7 cards from real CET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Endoscopic Equipment & Instrumentation flashcards as text
What is the purpose of leak testing an endoscope before high-level disinfection?
Answer: To detect internal channel breaches that could allow fluid ingress and damage internal components
Leak testing detects defects in the endoscope's external sheath or internal channels that would allow disinfectant or water to enter and damage the scope.
Which endoscopic ultrasound (EUS) transducer frequency provides higher resolution images but with less tissue penetration?
Answer: 12–20 MHz
Higher frequency transducers (12–20 MHz) produce finer resolution images of superficial structures but cannot penetrate as deeply into tissue.
What is the primary advantage of a high-definition (HD) endoscopy system over standard-definition?
Answer: Greater image resolution enabling detection of subtle mucosal abnormalities
HD endoscopy systems capture and display images at significantly higher pixel density, improving detection of subtle lesions and mucosal detail.
Narrow band imaging (NBI) enhances visualization of mucosal vasculature by:
Answer: Using filtered wavelengths of light (blue and green) selectively absorbed by hemoglobin
NBI uses optical filters to transmit only narrow-bandwidth blue (415 nm) and green (540 nm) light, which is strongly absorbed by hemoglobin, highlighting surface vessels.
In ERCP, a sphincterotome (papillotome) differs from a standard catheter because it contains:
Answer: A cutting wire that can be bowed to incise the sphincter of Oddi
A sphincterotome has an exposed cutting wire that is tensioned to bow the catheter tip, allowing electrosurgical incision of the biliary sphincter.
Which component of the endoscopy tower is responsible for converting the CCD/CMOS sensor signal into a viewable image?
Answer: Video processor (image processor)
The video processor receives the raw electronic signal from the endoscope's image sensor and processes it into a formatted video signal displayed on the monitor.
What is the function of the instrument elevator (bridge) found on duodenoscopes?
Answer: Raises and angles accessories exiting the channel tip to direct them toward the papilla
The elevator is a small lever at the distal tip of the duodenoscope that tilts exiting accessories upward and toward the bile duct orifice during ERCP.