Fluoroscopy Flashcards
1
Q
What mA does fluoroscopy typically work at?
A
5mA
2
Q
Which causes more radiation overall: fluoroscopy or x-ray?
A
Fluoroscopy b/c even though it only works at 5mA, it runs for a much longer time.
3
Q
What are the parts of the image intensifier?
A
1) Input phosphor (cesium iodide) –> converts x-rays to light
2) Photocathode (cesium & antimony) –> photoemission - light causes electrons to be emitted
3) Output phosphor (Zn cadmium sulfide) –> electrons are converted back to light
4
Q
What is flux gain?
A
The # photons @ input phosphor to # photons @ output phosphor.
5
Q
If the image intensifier is moved closer to the patient, what is the dose response?
A
Decreases dose to patient.
