Fluoroscopy

Question 1

What mA does fluoroscopy typically work at?

Answer 1

5mA

Question 2

Which causes more radiation overall: fluoroscopy or x-ray?

Answer 2

Fluoroscopy b/c even though it only works at 5mA, it runs for a much longer time.

Question 3

What are the parts of the image intensifier?

Answer 3

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

Question 4

What is flux gain?

Answer 4

The # photons @ input phosphor to # photons @ output phosphor.

Question 5

If the image intensifier is moved closer to the patient, what is the dose response?

Answer 5

Decreases dose to patient.