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What kind of radiation comprises 70-90% of the x-ray beam?
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What is the principal factor affecting beam quantity?
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RADT 456 EQ OP & QC
ARRT registry review covering equipment operation & quality control content area
| Question | Answer |
|---|---|
| What kind of radiation comprises 70-90% of the x-ray beam? | Bremsstrahlung; Pg. 431 |
| What is the principal factor affecting beam quantity? | mAs; Pg. 434 |
| What is the principal factor affecting beam quality? | kV; Pg. 434 |
| What is a relatively low-energy x-ray photon that uses all its energy to eject an inner shell electron, leaving an orbital vacancy? | Photoelectric effect; Pg. 434 |
| What is a fairly high-energy x-ray photon that ejects an outer shell electron? | Compton Scatter; Pg. 434 |
| What kind of interaction occurs between x-rays and matter with very low-energy x-ray photons - energies rarely used in diagnostic radiology? | Coherent (Classical) scatter; Pg. 435 |
| What functions to change mechanical energy to electrical energy? | Generators; Pg. 437 |
| What is characterized by varying amplitude and periodic reversal of polarity? | AC; Pg. 437 |
| Who made the observation that a magnetic field will induce an electric current in a conductor if there is motion of either the magnetic field or the conductor? | Faraday; Pg. 439 |
| In Bremsstrahlung radiation, energy loss is given up in what form? | X-ray photon; Pg. 444 |
| What is chosen for the target material because of its high atomic number, high melting point, and thermal conductivity? | Tungsten; Pg. 446 |
| What percent of the kinetic energy of the electron stream is converted to x-rays? | 0.2%; Pg. 447 |
| mA x s x kV (single phase) is the formula to solve for what? | Heat units; Pg. 448 |
| What cause of x-ray tube failure is caused by thermionic emission? | Vaporized tungsten; Pg. 449 |
| If an IP and its PSP storage plate has been stored and unused for _____ hours or more, the plate should be erased prior to use. | 48; Pg. 462 |
| Contrast modification, image subtraction, and windowing and all components of what? | Image manipulation postprocessing; Pg. 463 |
| T/F: Fewer frames per second result in lower patient dose. | True; Pg. 478 |
| How many minutes are on the timer that measures accumulated fluoroscopic examination time when the audible sound or interruption of exposure occurs? | 5 minutes; Pg. 478 |
| Selected kilovolt and actual kilovolt value should not differ by more than +/- what amount of kV for general diagnostic equipment? | +/- 4 kV; Pg. 494 |
| What device can be used to evaluate each mA station? | Aluminum step-wedge (penetrometer); Pg. 495 |
| The selected exposure time should be within what percent of the actual exposure time? | 5%; Pg. 495 |
| Digital radiation meter should register radiation output that does not vary more than what percent? | 5%; Pg. 496 |
| What is defined as the thickness of any absorber that will reduce x-ray beam intensity to one-half its original value? | Half-value Layer; Pg. 496 |
| What test uses the special wire-mesh test device to provide adequate screen care? | Screen-to-film contact testing; Pg. 497 |
Created by:
Kaci Gehlhausen
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