Match the x-ray tube part with the appropriated description(s).
A. anode B. cathode
6. Positively charged
7. Negatively charged
8. Contains the target
9. Contains the filament
10. Heated to produce thermionic emission of electrons
11. Often contains small and large filaments (dual focus) within a focusing cup
6. A 7. B 8. A 9. B 10. B 11. B
99% of the energy of the electrons striking the target is converted to _______.
Electron striking the target interacts with target atom nucleus, slows down, losing kinetic energy
that is converted into an x-ray.
Electron striking the target ejects inner shell electron of target atom; an outer shell electron fills
the vacancy with the release of an x-ray photon.
Area of target which with which electrons interaction
Propels electrons toward a specific area of the anode target
Rotates during exposure to distribute heat
Used to provide greater image detail.
The effective focal spot size is smaller than the actual focal spot size.
Because of the anode heel effect, radiation intensity is greater at the cathode and less at the anode ends of the x-ray beam.
To produce a more uniform radiographic density, thinner parts should be positioned under the anode portion of the x-ray beam.
Higher kVp results in x-rays that are less penetrating.
Higher kVp should be used for larger or more dense body parts.
The Pyrex glass envelope of the x-ray tube supports the electrodes and maintains a vacuum.
An exposure made at 200 mA, 0.1 sec, 80 kVp would have ___________ mAs.
____________________ removes low energy x-ray photons from the x-ray beam that cause unnecessary patient exposure.
Radiation scatter production is increased when
A. the collimator is wide open
B. the kVp is high
C. the body part is thick.
D. all of the above