Definitions
The ability to perceive fine detail.
What is visual acuity?
This is a part of the eye used for night vision.
What are rods?
Misrepresentation of the true size of shape of a (n) object is known as:
What is distortion?
This is made of cesium iodide and absorbs the remnant x-ray photon energy and emits light in response.
What is the input phosphor?
Barium is an example of this type of contrast agent.
What is positive?
This type of study is an examination that shows the motion of circulation or the motion of internal structures.
What is dynamic?
This improves the ability to see small structures (spatial resolution), but increases patient dose.
What is magnification?
The inventor of the fluoroscope in 1896.
Who is Thomas A. Edison?
This is a circular plate with a hole in the middle through which through which electrons pass to the output phosphor.
What is the anode?
What is the atomic number of iodine?
What is 53?
A reduction in brightness at the periphery of an image is called?
What is vignetting?
_______ is the ability of an image intensifier tube to convert x-ray energy into light energy and increase the brightness of the image in the process.
What is brightness gain or conversion factor?
During conventional fluoroscopy, the x-ray tube is operated at less that _____ mA, contras this with a radiographic exam in which the x-ray tube is measured in _______ of mA.
What is 5 and hundreds?
This part of the image intensifier is usually made of zinc cadmium sulfide.
What is the output phosphor?
Air is an example of this type of contrast agent?
What is negative?
The image brightness level that is maintained automatically by varying the kVp or mA or sometimes both.
What is automatic brightness control (ABC)?
This is a light-sensitive semiconducting device that generates an electric charge when stimulated by and stores this charge in a capacitor.
What is a charged-coupled device or CCD?
This type of television camera tube is most often used in television fluoroscopy.
What is vidicon?
The image intensifier is approximately ____ cm long.
What is 50?
What is the atomic number of barium?
What is 56?
_____ is the ratio of the square of the diameter of the input phosphor to the diameter of the to the square of the diameter of the output phosphor.
What is minification gain?
This is the weakest link in terms of resolution in the fluoroscopic chain.
What is the monitor?
The fluoroscopic chain consists of what 4 things?
What are the x-ray tube, image intensifier, recording system, and viewing system?
Name the 5 basic parts of the image intensifier.
What are input phosphor, photocathode, electrostatic focusing lenses, accelerating anode, and the output phosphor/
This is the recommended kVp range for a (air contrast) barium enema.
What is 80-90?