Xray (Erin) Flashcards
What happens to the quantity of x-ray photons when the kV is increased?
Quantity of xray photons increases
What happens to the average energy of xray photons when the kV is increased?
Average energy increases
What happens to the maximum xray photon energy when the kV is increased?
Maximum energy increases
What happens to the average photon energy in a beam when mA is increased?
No change
What happens to the minimum photon energy in a beam when mA is increased?
No change
What happens to the maximum photon energy in a beam when mA is increased?
No change
What effect does filtration have on the average energy of photons?
Increases the average energy (removes the lower energy photons)
What effect does filtration have on the total number of photons?
Decreases the total number of photons (as lower energy photons are removed)
What happens to wavelength as frequency increases?
It decreases (they are indirectly proportional to each other)
What happens to frequency as wavelength increases?
It decreases (they are indirectly proportional to each other)
What effect does increasing the atomic number of the anode target have on the quantity of x-ray photons?
Increases the quantity of x-ray photons
What effect does increasing the atomic number of the anode target have on the energy of the characteristic x-rays produced?
Increases the characteristic energies (higher atomic number = more positive nucleus = higher electron binding energies)
Does the photoelectric or compton effect predominate at lower kVp?
Photoelectric
Does the photoelectric or compton effect predominate at higher kVp?
Compton
What effect does decreasing the anode angle have on the focal spot size?
Decreases the focal spot size
What effect does increasing the anode angle have on the focal spot size?
Increases the focal spot size
What effect does decreasing the anode angle have on the anode heel effect?
Larger anode heel effect
What effect does increasing the anode angle have on the anode heel effect?
Smaller anode heel effect
What effect does increasing mA have on noise?
Decreases noise
What effect does making the image receptor thicker on noise?
Decreases noise
What effect does decreasing kV have on image contrast?
Increases contrast
What effect does increasing kV have on image contrast?
Decreases contrast
What effect does increased scatter have on image contrast?
Decreases image contrast
What effect does increasing the atomic number difference in objects have on image contrast?
Increases contrast