attenuation applications Flashcards
1
Q
low kVp have a (high/low) probability of CS, PE
A
high PE
high CS
2
Q
high kVp have a (high/low) probability of CS, PE
A
low both
both decrease as kVp increases
3
Q
which (PE/CS) is more likely at high kVps
A
Compton scatter
4
Q
relate (equation) photoelectric effect
A
z^3 / E^3
5
Q
there is more subject contrast at (low/high) energy
A
low
can better see differences in z and density
6
Q
Compton scatter density formula
A
CS density/E
7
Q
why do we use very high kVp for chest imaging
A
very high natural subject contrast (air, soft tissue, bone)
so 110-130 to get more CS
8
Q
what does heavy element filters do?
A
selectively transmit a narrow range of photons frequencies
9
Q
what are 2 common contrast media and their k-shell BEs
A
iodine - 33
barium - 37
