RTE 1401 Exam 1 Questions with Correct
Answers
What are the 5 types of patient interactions?
1. coherent scattering
2. photoelectric
3. compton scattering
4. pair production
5. photodisintegration
What energy level does coherent scattering occur?
below 10 keV
What energy level does photoelectric occur?
Low kVp
What energy level does compton scattering occur?
All energies
At what energy level does pair production occur?
1.02 MeV
At what energy level does photodisintegration occur?
10 MeV
Which 2 interactions are important to our diagnostic range?
compton scatter and photoelectric
Explain photoelectric interactions
, occurs with a low kVp, secondary radiation occurs through characteristic cascading, long
wavelength/low frequency
Explain Compton scattering
happens in all matter, more matter more scatter, any energy level
Which interaction results in image noise and reduces contrast?
Compton Scattering
Additional names for Classical Scatter.
coherent, thompson, rayleigh
why doesn't classical scattering normally occur in the patient at our diagnostic range?
low energy, filtered out of the beam
When does compton scattering occur?
When an outer x-ray photon interacts with a loosely bound outer shell electron. The photon
transfers part of its energy to the electron and removes the electron from the shell
Which interaction produces secondary radiation?
photoelectric
Which interaction is responsible for occupational dose?
Compton scattering
Which interaction contributes significantly to the patient dose?
Photoelectric
Answers
What are the 5 types of patient interactions?
1. coherent scattering
2. photoelectric
3. compton scattering
4. pair production
5. photodisintegration
What energy level does coherent scattering occur?
below 10 keV
What energy level does photoelectric occur?
Low kVp
What energy level does compton scattering occur?
All energies
At what energy level does pair production occur?
1.02 MeV
At what energy level does photodisintegration occur?
10 MeV
Which 2 interactions are important to our diagnostic range?
compton scatter and photoelectric
Explain photoelectric interactions
, occurs with a low kVp, secondary radiation occurs through characteristic cascading, long
wavelength/low frequency
Explain Compton scattering
happens in all matter, more matter more scatter, any energy level
Which interaction results in image noise and reduces contrast?
Compton Scattering
Additional names for Classical Scatter.
coherent, thompson, rayleigh
why doesn't classical scattering normally occur in the patient at our diagnostic range?
low energy, filtered out of the beam
When does compton scattering occur?
When an outer x-ray photon interacts with a loosely bound outer shell electron. The photon
transfers part of its energy to the electron and removes the electron from the shell
Which interaction produces secondary radiation?
photoelectric
Which interaction is responsible for occupational dose?
Compton scattering
Which interaction contributes significantly to the patient dose?
Photoelectric
