Rad Tech Boot Camp Assessment Flashcards
Attenuation of the X-ray beam is defined as:
A reduction in X-ray beam intensity after passing through matter.
The part of the beam that exits the X-ray tube is called:
Primary Beam
Which of the following are by-products of a photoelectric interaction?
Electron only
Which of the following are by-products of a coherent scattering event?
Scattered photon only
The part of the beam that exits the patient is called:
Exit beam
A high kVp setting will result in ____ and ____.
Higher energy , less proportional attenuation
T/F Ionization occurs during a coherent scattering event.
False
Which of the following will produce the greatest amount of attenuation? (2 answers)
- Thicker part
- Thinner part
- Higher atomic number
- Lower atomic number
1&3
A low kVp setting will result in ____ and _____.
Lower energy greater proportional attenuation
T/F Ionization occurs during a Compton scattering event.
True
Another name for Coherent scatter is:
Another name for Coherent scatter is:
T/F Coherent scatter results from the ionization of an atom.
False
Within Coherent scatter, the incident photon’s energy is ___________ to the scattered photon.
Equal
Coherent scatter is most likely to occur when the incident X-ray photon has an energy level less than:
10 kev
An increase in coherent scatter would have this effect on spatial resolution
No effect
Which of the following are potential photon interactions in the matter?
- Characteristic Radiation
- Photoelectric Effect
- Compton Scattering
- Coherent Scattering
2,3,4
Select all factors that are affected by Compton scattering:
- Image contrast
- Patient radiation dose
- Occupational exposure
1,2,3
Compton scattering interaction with matter results in total absorption of the X-ray photon. T/F
False
Compton scattering involves the interaction between an incident photon and an inner shell electron T/F
False
An increase in Compton scatter has what effect on image contrast?
Decreased Image contrast
A “small angle” Compton scatter photon would most likely strike the:
IR
Select the type of Compton scattering direction with the highest total energy.
Forward Scattering
Select all factors that have an effect on the production of Compton scatter:
- mAs
- kVp
- Body Habitus
2& 3
With all factors being equal, what implementations can decrease the amount of Compton scattering on the radiographic image?
- Increased grid ratio
- Increased SID
- Increased OID
1 & 3
What percent of the energy of the photon that enters the body is absorbed in a photoelectric interaction?
100%
During a photoelectric interaction in the patient, when the X-ray photon interacts with an inner shell electron of an atom, what happens to that electron?
it is ejected from the atom
Which of the following result from a photoelectric interaction in the body?
A. Absorption of the photon energy
B. Creation of a characteristic photon
C. Ejection of an electron that becomes a photoelectron
All of them
With which of the following is photoelectric absorption most closely associated?
- production of scatter radiation
- increased patient dose
- damage to tissues and cells
2 &3
Areas of the body that experience large numbers of photoelectric interactions are related to what type of radiographic appearance?
They will appear lighter/brighter on the image
Which of the following anatomical structures will result in the least photoelectric absorption?
Lungs
Which of the following is related to a decrease in the number of photoelectric interactions occurring during an X-ray exposure?
Increased Kilovoltage
An increase in the number of photoelectric interactions occurring is associated with what type of image contrast?
Higher Contrast
Which of the following projections would result in the greatest amount of photoelectric absorption of the X-ray beam?
PA chest
Lateral chest
Lateral lumbar spine
Lateral Lumbar spine
Which of the following descriptions best describes the term “photoelectron”?
It is the electron that is ejected from the atom when it is struck by the photon
