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RADT 456 Equipment O
Equipment Operation and Quality Control: Study
| Question | Answer |
|---|---|
| A high-speed electron passing near or through a tungsten atom, is attracted and slowed down by positively charged necleus and deflected from its course with a loss of engery. | Bremsstrahlung Radiation |
| What is energy loss given up in the form of? | an x-ray photon |
| What is the energy of the characteristic ray equal to? | the difference in energy between the K and L shell energy levels |
| What are shorter wavelengths associated with? | higher freequency, higher energy, and increased ionizing potential |
| What can x-ray photons do? | pass through the part, be absorbed by the part,and scatter within the part |
| What changes mechanical energy to electrical energy? | generators |
| The distance between two consecutive crests; one positive and one negatice half-cycle? | wavelength |
| What are the number of cycles per second called? | frequency |
| What type of principle do transformers operate on? | mutual induction |
| What is another name for step-down transformers? | filament transformers |
| What does the x-ray tube consist of? | anode (positive electrode), cathode (negatice electrode), and glass envelope (vacuum) |
| What is a graphite/molybdenum disk with a beveled edge called? | an anode |
| What conducts heat away from the anode face? | copper stem |
| What are the characteristics of Tungsten as a target material? | high atomic number increases x-ray production, high melting point resist pitting and creaking, and thermal conductivity for heat dissipation |
| What is teh effective focal spot that is always smaller than the actual focal spot? | line focus principle |
| What functions to regulate the length of the x-ray exposure? | timer |
| What functions to automatically adjust for any fluctuations in incoming voltage supply? | line coltage compensator |
| What does the radiographer use to choose the kilovoltage? | Kv selector |
| What is a variable transformer that operates on AC and enables the radiographer to select kilovoltage? | autotransformer |
| What are the different types of x-ray timers? | mechanical, synchronous, impulse, electronic, mAs, and AEC |
| What are the primary low-voltage circuit components? | main switch/circuit breaker, autotransformer, kv selector switch, line voltage compensator, timer primary coil of HV transformer, exposure switch |
| What is CR resolution determined by? | the size of barium fluorohalide phosphor, width of laser beam, and monitor matrix |
| What is used to evaluate the focal spot size? | slit camera |
| What image matrix size with result in the best spatial resolution? | 2,048 X 2,048 |
| What is the device used to ensure reproducible images, regardless of tissue density variations? | ionization chamber |
| Changes in window width in digital imaging can result in changes in: | contrast |
| What circuit devices operate on the principle of self-induction? | autotransformer and choke coil |
| How often should fluoroscopic shielding apparel be fluoroscoped to check for cracks? | annually |
| What is the spinning-top test used to evaluate? | timer accuracy and rectifier failure |
| What can cause poor screen-to-film contact? | damaged cassette frame, foreign body in cassette, and warped cassette front |
Created by:
anbrunes
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