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# Limited Permit X-Ray Technician Final

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 Question
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.

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Created by: radtechstudent on 2010-05-08