Fluoroscopy #2 (Part 2) Flashcards
Which of the following are the most common television camera tubes that are used in image intensified fluoroscopy?I. Vidicon II. Saticon III. Image orthicon IV. Plumbicon
I and IV
What is the principal disadvantage to coupling the television camera to the image intensifier by fiber optics?
A photospot camera cannot be used
What refers to the image intensifier input phosphor component of image intensified fluoroscopy?
Cesium iodide
What is a critical component in optically coupling an image intensifier to a photospot camera?
Objective lens
What is the component of the television monitor where the video signal is transformed into an image?
Phosphor screen
What refers to the brightness gain component of image intensifier fluoroscopy?
Minification
What is normally the weakest imaging link in television fluoroscopy?
The television monitor
In an optical coupling arrangement, which is nearest the television camera?
Camera lens
What refers to the photoemissive component of image intensified fluoroscopy?
Electrons from light
When the voltage on the Electrostatic Focusing Lens changes from -20 volts to -30 volts, what occurs?
The focal point moves closer to the Input Phosphor
When the Image Intensifier is in the magnification mode, the mA to the x-ray tube increases; True or False?
True; The mA to the x-ray tube increases
The radiologist shifts from 12 to 9 on the Field of View controls. How will this affect the resolution of the image as seen on the monitor?
increase it
When shifting the Image Intensifier to the magnification mode, what is the overall effect on the quantity of x-rays in the remnant beam?
An increase
One of the disadvantages of the Mirror Optical system of Image Monitoring was that there was?
Loss of light from the Output Phosphor to the viewing glass
What is the relationship of the patient dose when using 105 mm spot films compared to the cassette-loaded spot films?
About 1/2
