Exposure of Radiation Flashcards
1
Q
What does Ma control?
A
Number of electrons available
2
Q
Quantity is associated with…
A
Miliamperage
3
Q
How do you calculate MAS?
A
Ma x time
4
Q
Higher Ma means…. ____ time with the same number of xrays produced
A
Shorter
5
Q
Quality is associated with…
A
KVP
6
Q
More penetrating power.
A
More KVP
7
Q
Santes rule
A
2 x thickness + 40
8
Q
SID
A
Source image distance
9
Q
What does SID affect?
A
Image intensity and detail if moved from 40 in
10
Q
What does lower KVP give you?
A
More contrast (for organs)
11
Q
What do scatter radiation affect?
A
Increases as KVP increases, reduced contrast, cause scatter when radiation bounces off patient
12
Q
As the filament gets hotter…
A
Ma increases
13
Q
How much must we change KVP to see a difference?
A
10-15%
14
Q
How much must we change MAS to see a change?
A
30%-50%
15
Q
If we want more black…
A
More KVP
