Key Terms
Allows imaging of the movement of internal structures
Fluoroscopy
The x-ray tube is located _____ the table
Under
Personnel lead aprons recommend _____ mm of lead
0.5
_______ converts exit radiation to visible light
Input Phosphor
The x-ray tube is located above the table.
False
A function of the fluoroscopic unit that maintains the overall appearance of the images by automatically adjusting kVp, mA, or both
Automatic Brightness Control (ABC)
Fluoroscopic images viewed on a _______
Monitor
The source to skin distance (SSD) should be no less than _______ (distance) for stationary fluoro units
38 cm (15 in)
________ converts visible light to electrons
Photocathode
The switch used to expose the patients to radiation us know as the Deadman Switch
True
When operated in ____________, the voltage to the electrosatic focusing lenses is increased
Magnification Mode
Contains several layers including the liquid crystal layer sandwiched between polarizing layers
Liquid crystal display (LCD) monitors
The source to skin distance (SSD) should be no less than ______ (distance) on a mobile fluoro unit
30 cm (12 in)
______________ accelerates electrons toward an anode to strike the output phosphor
Electrostatic focusing lenses
When spot-filming during conventional fluoroscopic image intensification, the radiation dose to the patient is decreased.
False
Releasing the pressure applied to the pedal or switch terminates the radiation exposure as is know as the _________
Deadman Switch
The major components of an a image intensifier are surrounded by ________
A disadvantage of using magnification mode is __________
The patient receives additional radiation dose
________ converts electrons to visible light.
Output phosphor
The purpose of the camera tube or CCD is to record the fluoroscopic image.
False
Digital fluoroscopy is improved by using ___________
A Charge-Coupled Device (CCD)
The light intensities are equal to the intensities of the exit radiation and are converted to electrons by a __________
Photocathode
A protective curtain with at least _______ mm of lead equivalent must be placed between the patient and the operator to reduce exposure to the operator
0.25
The greater the conversion factor or brightness gain, the _______ the efficiency of the image intensifier
Greater
The ABC can be slow in responding, seen as a brief delay in the brightness adjustment.
True