Flashcards in Lecture #2 Deck (21):
1
High E Bremsstrahlung
e- directly collide with nucleus
2
Med E Bremsstrahlung
e- pass close to nucleus
3
Low E Bremsstrahlung
e- pass a far distance from nucleus
4
Characteristic Radiation... What is it?
high speed e- hits another e- and knocks it out of orbit
5
What is found at the Cathode?
- charge
Tungsten filament
focusing cup
6
What is found at the Anode?
+ charge
Tungsten target
Copper stem
7
What does placing a target at an angle provide?
Smaller effective focal spot for a sharp image
8
Low V tube current
Heats the tube filament and makes an e- cloud
9
High tube V
accelerates the e- stream
10
Step-Down Filament Transformer
Used to reduce voltage and heat the filament
11
Step-Up Transformer
Increase V to speed up electrical force
12
Auto - Transformer
controls the Step-Up transformer to get the desired kVp
13
What is the most frequent source of malfunction in X-ray tubes?
Filament burnout
14
What is directly proportional to the tube current?
Quantity of radiation
15
when tube current (ma) increases then....
More e- are released to the target
16
increase in kVp causes
and increase in x-ray penetration of matter
17
Why are aluminum filters used?
to absorb low E phtons
18
What is a Collimator?
a metal tube used to reduce the size of the x-ray
19
Define Coherent Scattering
low E photons are deflected by out ring e-
Causes "foggy film"
20
Define Compton Scattering
Occurs when a photon hits an e- and it is shot off
Causes darken images
21