3/28 Quiz
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kVp and mA determine the _________ level of the fluoroscopic image.
Brightness
What is above the table in nondigital fluoroscopy?
Spot imaging device and image intensifier
In nondigital fluoroscopy, the x-ray tube and IR are connected with a ____ to keep them the appropriate distance apart regardless of ________
C-arm Movement of the equipment
The X-ray tube for fluoroscopy is operated at ___ to ___ mA
3 to 5
Regulation of kVp and mA for fluoroscopy depends on
The part being examined
kVp and mA are automatically adjusted during fluoroscopy by a process known as
Automatic brightness control (ABC) -AKA automatic brightness stabilization Or automatic gain control
Visible image on the monitor is a result of
Image intensification
The image intensifier tube converts ______ energy into _____
X-ray Visible light
Once X-ray energy is turned it visible light it is turned into an
Electronic signal (that is displayed on the monitor)
Receives exit rays from the patient and converts them into visible light
Input phosphor
Visible light from the input phosphor strikes the
Photocathode
The photocathode releases electrons in amounts ________ proportional to the visible light striking it
Directly
The electrons coming from the photocathode are concentrated and directed towards the other end of the image intensifier tube by a series of _________ and by ____ kVp applied through the tube.
Electrostatic lenses 25
Once electrons reach the other end of the image intensifier, they will strike the
Output phosphor
The energy of the electrons is converted by the phosphors to visible light in amounts ___ to ____ times greater than at the photocathode.
50 to 75
The increase in brightness caused by acceleration of the electrons is called
Flux gain
Is the output phosphor larger of smaller than the input phosphor?
Smaller
the output phosphor is smaller than the input phosphor, resulting in an increase in brightness called
Minification gain
The product of minification gain and flux gain is
Total brightness gain
Total brightness gain ranges from ______ to ______ and decreases as the tube ages.
5,000 to 20,000
_______ is possible only with dual focus or tri focus tubes, which results in increase patient dose
Magnification
In Digital fluoroscopy, what is added?
Operating console and computer work station
In Digital fluoroscopy, the image intensifier may be replaced by a
Flat panel IR
A flat panel image intensifier provides better resolution of
Smaller anatomy