Unit 6 - Radiology (components and functions)

Question 1

3 components of the Xray tube

Answer 1

Lead- glass housing
Cathode
Anode

Question 2

Vacuum tube that prevents xrays from escaping in all directions

has “window” that allows xray beam to exit tube and directs it towards the aluminum discs, lead collimator, and PID

Answer 2

Leaded-glass housing

Question 3

produces negative electrode

Answer 3

Cathode

Question 4

produces xray photons

Answer 4

Anode

Question 5

• has tungsten wire/filament in molybdenum cup

- electron (-) generator (when wire heats up)

Answer 5

Cathode

Question 6

purpose of molybdenum cup

Answer 6

focuses (-) electrons into a beam and directs it across the tube to the tungsten target of anode

Question 7

• has thin tungsten plate embedded in copper stem

- converts electrons (-) into xray photons (+)

Answer 7

Anode

Question 8

purpose of copper stem

Answer 8

to dissipate heat away from tungsten plate

Question 9

PID stands for..

Answer 9

Position Indicating Device

Question 10

Outer shelled electrons that form a cloud away from the tungsten filament when cathode heats up

Answer 10

Thermionic emission

Question 11

where does the heat that is produced after the electrons are converted to photons go?

Answer 11

absorbed by insulating oil

Question 12

Operation of an xray machine

Answer 12

• turn on machine
• current directed to filament circut/step down transformer
• filament heats up (in cathode)
• thermionic cloud builds up
• push exposure button
• electrons projected form cathode to anode
• electrons hit tungsten plate and bounce/convert to xray photons and heat (99%)
• heat is absorbed by insulating oil/ xrays travel down PID