Fluoroscopy Flashcards
The fluoroscopic tube is usually operated at less than
5 mA
Patient dose in Fluoroscopy is
Higher than general diagnostic imaging
Higher than in most CT
Monitored on the control panel
ABC stands for
Automatic brightness control
The characteristic of fuzzy-edged images when viewing fluoro images are called
Vignetting
What combination of kVp and mA should typically be used in fluoroscopy
High kVp, Low mA
In digital flat panel fluoroscopy, the under the table fluoro tube operates in the same mA range as regular x-ray tube (T/F)
True
The output phosphor always has a larger diameter than the input phosphor of the image intensifier (T/F)
False
Put these components of the image intensifier in the correct order from the start of the process to the end of the process: electrostatic lenses, photocathode, anode, input phosphor, output phosphor
Input phosphor, photocathode, electrostatic lenses, anode, output phosphor
Brightness gain X Flux gain= minification gain (T/F)
False, look up the real answer
The usual potential from photocathode to anode in the image intensifier is around
25,000 volts
Which factors can make non-digital fluoroscopy images appear to be of lower quality than general diagnostic images
Vignetting
Pin cushioning
Vailing glare
Vignetting is worse on magnified images (T/F)
False
A CRT (TV) screen for viewing images converts electrons to light rays at the screen phosphor (T/F)
True
Spot films can be obtained using regular, general diagnostic image receptors (T/F)
True
What is the duty cycle for an x-ray tube (in digital set-up) that is energized for 300 ms of a 1000ms wavelength
30%
