Unformatted text preview: Interactions with Matter
a Which of these x-ray interactions with matter
is/are related to the energy of the x-ray?
5. Photoelectric absorption
Photodisintegration 1 only
1 and 2
1, 2 and 3
1, 2, 3, 4 and 5
1 Review Interactions with
1. Which of the five interactions with
matter discussed in class are important
in diagnostic level radiography?
a 2. Which of the x-ray interactions with
matter is more likely to occur with high
atomic number tissues?
a Which x-ray interaction with matter is
related to the energy of the x-ray
a 2 More Review…
4. Which x-ray interactions is the most
likely to occur at energies below 10
a 5. Which x-ray interaction with matter is
most likely to occur at energies between
a 6. Which x-ray interaction with matter is
most likely to occur at energies greater
than 60 keV?
a 3 Moving on….
7. Which shell level is ionized in the
photoelectric absorption interaction?
a 8. What happens to the original x-ray
following the photoelectric interaction?
a 9. Which shell level is ionized in the
Compton scatter interaction with
a 10. What happens to the original x-ray
following the Compton scatter
11. What happens to the original x-ray
following the Coherent scatter
a 12. State three other names for the
Coherent scatter interaction?
a 5 CONTROL OF
SCATTER RADIATION 6 7 1. USE RELATIVELY
LOW kVp TECHNIQUES
LOW a a Compton scatter interactions
a as kVp INCREASES
as kVp Use optimum kVp techniques!
8 2. USE COMPRESSION Decreased patient thickness
a Decreased Compton scatter interactions
a 9 PA vs. AP Lumbar Spine
Exam 10 3. COLLIMATE! As the collimated field size decreases
a Compton scatter interactions with
a 11 12 WHEN COLLIMATING
‘SIGNIFICANTLY” a Increase mAs by 50%
50% 13 4. USE GRIDS (BUCKY) a Grids are the best device that absorb
scatter 14 CONTROL OF SCATTER
TO BE CONTINUED…….
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- Winter '11
- Photon, Compton scattering, compton scatter, Compton scatter interactions