Dedicated Imaging Equiptment

Question 1

Fluoroscopy

Answer 1

Provides dynamic visualiztion of internal structures

Question 2

X-ray fluoroscopy operates at what mA?

Answer 2

3-5 mA

Question 3

What determines the brightness in fluoroscopy?

Answer 3

mA and kVp

Question 4

kVp and mA are automatically adjusted during fluoroscopy by a process called?

Answer 4

Automatic Brightness Control

Question 5

Automatic Brightness Control is also called what?

Answer 5

Automatic brightness stabilization; Automatic gain control

Question 6

What does the Image Intensifier tube do?

Answer 6

Converts x-ray energy into visable light and then into an electronic signal that is displayed as an image on the monitor

Question 7

Parts of the Image Intensifer Tube?

Answer 7

1. Input phosphor
2. Photocathode
3. Electrostatic lenses
4. Output phospher

Question 8

Purpose of input phospher?

Answer 8

Converts x-ray energy to light energy

Question 9

Photocathode purpose?

Answer 9

Converts light energy to electron energy

Question 10

Electrostatic lenses purpose?

Answer 10

Keeps electron beam narrowed as it travels towards output phospher

Question 11

Output phospher purpose?

Answer 11

Converts electron energy to light energy for viewing

Question 12

What is total brightness gain?

Answer 12

Flux gain + minification gain

Question 13

Flux gain

Answer 13

Gain in brightness caused by acceleration of electronic beam inside image-intensifier tube

Question 14

Minification gain

Answer 14

Gain in brightness caused by minification of the image at the output phospher compared with input phospher