Limited Permit X-Ray Technician Final
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help
|
|
||||
|---|---|---|---|---|---|
| 1. Describe the source and the charge of free electrons. | Tungsten filament, negative charge, static (not moving) | ||||
| 2. In your own words describe the process of electron acceleration. | kVp and applying voltage (voltage = velocity = acceleration | ||||
| 3. Describe the line focus principle. | Straight path from the focusing cup to the anode, reflection angle = incident angle | ||||
| 4. What part of the radiographic tube is responsible for deceleration of electrons. | Anode target | ||||
| 5. List and describe the two target interactions and what they produce. | Bremsstrahlung - short scale ; Characteristic - long scale | ||||
| 6. When discussing the x-ray beam, what is the relationship between frequency and wavelength? | Inversely proportionate, higher the frequency the smaller the wavelength and vise versa. | ||||
| 7. What controls beam quality and what does it produce? | KVP and produces contrast (kVp=quality=contrast=image brightness) | ||||
| 8. Quantity of ionizing radiation is the product of? | mA and time (level of doness, heat & time) | ||||
| 9. Please describe the interaction or effects that produce the radiographic image. | interaction: transmission & absorption ; effect: photoelectric (=image producing) | ||||
| 10. The inverse square law discusses the relationship between which two factors? | distance & intensity | ||||
| 11. List the properties (characteristics) of diagnostic radiation x-rays. | Travel in straight paths; invisible; rays are divergent, ionize matter, high frequency | ||||
| 12. Besides the photoelectric effect, name and describe 2 other photon interactions. | Compton Scatter: high energy; Coherent (Classical) Scatter: low energy | ||||
| 13. Define the term "attenuation". | Decrease of energy. 3 factors: absorption, scatter, reflection. Absorption is dominant factor. | ||||
| 14. List the items found on modern control panels. | Controls for mA, kVp (major & minor), line control, AEC, meters, backup timer | ||||
| 15. Why is tungsten used in modern anodes? | High heat storage capacitor, high heat dissipator, and high atomic number | ||||
| 16. List at least 2 types of collimators. | aperture, cones, shutters, cylinders | ||||
| 17. What are the factors for manual exposure? | kVp, ma & time, filtration, distance (SID, OID) | ||||
| 18. The x-ray tube needs what type of current? | DC (Direct Current) | ||||
| 19. What part of the x-ray circuit provides the direct current to x-ray tube? | Rectifier(also battery & capacitor) | ||||
| 20. Please provide your instructor with a basic explanation of the production of the x-ray beam, not the radiographic image. (hint: do not include what happens to the patient) | On the cathode side, filament creates electrons that have a negative charge. High voltage generator starts the rotation of anode (positive side). Once electrons interact w/ tungsten target creating protons therefore making useful beam. |
Embed Code: If you would like this activity on your web page,
copy the script below and paste it into your web page.
show me how
Created by:
radtechstudent
on 2010-05-08