What is fluoroscopy used for?
it provides dynamic visualization of internal structure
Where is the x-ray tube located in a stationary fluoro set up?
under the table
What is the mA used in fluoro?
between 3-5 mAs
What adjusts kVp and mA during fluorocopy studies?
ABC (automatic brightness control)
AKA
automatic brightness stabilization
automatic gain control
What does an image intensifier tube do in nondigital fluoro?
it converts x-ray energy into visible light and then into an electronic signal that is displayed on the monitor
What are the layers in the image intensifier tube?
Input phosphor
photocathode
focusing lenses
output phosphor
What does the input phosphor do?
(image intensifier)
receives exit rays from the patient and converts them into visible light
What does the photocathode do?
(image intensifier)
the visible light from the input phosphor strikes the photocathode and it releases electrons in amounts directly proportional to the visible light striking it
What do the focusing lenses do?.
(image intensifier)
it concentrates and directs electrons towards the other side of the image intensifier tube
what does the output phosphor do?
(image intensifier)
it converts the energy of the electrons to visible light in the amounts of 50 to 75 times greater than the photocathode
What is flux gain?
the increase in brightness caused by an acceleration of electrons
How do you calculate total brightness gain?
minification gain x flux gain
What makes magnification possible in non digital fluoro?
dual focus or tri focus tubes but it results in increased patient dose
What is used in digital fluoro instead of an image intensifier?
a flat pannel IR similar to DR technology
Why is pulsed fluoroscopy beneficial for the patient?
it helps reduce patient dose
-
Intro to Image Production24
-
Equipment used in the production of x-rays42
-
The x-ray tube22
-
X-Ray Production31
-
Fluoro15
-
Quality Control of x-ray producing equipment14
-
Digital imaging acquisition CR and DR15
-
Digital imaging exposure29
-
Grids and scatter related software37
-
Spatial resolution9
-
Distortion11
-
Digital image overview20
