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RADT 465 Equip & QC
ARRT Registry Review Covering Equipment Operation and QC Content Area
| Question | Answer |
|---|---|
| How many milliroentgens per milliampere-seconds (mR/mAs) are produced when exposure factors of 85 kV, 400 mA, and 12 ms create an output exposure of 150 mR? | 31 mR/mAs (Saia p 279) |
| What is the cause of pitting, or small surface melts, on the anode's focal track? | Repeated, frequent overloading (Saia, p 280) |
| What is used to test the congruence of the x-ray beam with the light field? | Radiopaque objects (Saia, p 281) |
| What is the function of a phototimer? | Terminate the x-ray exposure once the IR is correctly exposed (Saia, p 282) |
| During Bremsstrahlung (Brems) radiation production what is actually occurring? | An electron approaching a positive nuclear charge changes direction and as a result loses energy (Saia, p 283) |
| What are some components of digital imaging? | Computer manipulation of the image, formation of an electronic image on the radiation detector (Saia, p 284) |
| What type of filtration is considered inherent? | X-ray tube glass envelope & x-ray tube port window (Saia,p 285) |
| Radiographic kV settings are to be tested annually and must be accurate to within what? | +/-4 kV (Saia, p 286) |
| What two factors, when multiplied together, make up the total brightness gain? | Flux gain & minification gain (Saia, p 287) |
| Which characteristics of targets within an x-ray tube determine heat capacity? | Rotation of the anode, diameter of the anode, & size of the focal spot (Saia, p 288) |
| How often must radiographic equipment be inspected for linearity and reproducibility? | Annually (Saia, p 289) |
| What are some advantages of battery-operated mobile x-ray units? | Ability to store a large quantity of energy & ability to store energy for extended periods of time (Saia, p 290) |
| What device, through varying resistance, is used to control voltage? | Rheostat (Saia, p 292) |
| What formula is used to determine the number of heat units produced using three-phase, six-pulse equipment with a given exposure? | mA x time x kV x 1.35 (Saia, p 293) |
| The material that makes up the image intensifier's input phosphor is called what? | Cesium iodide crystals (Saia, p 294) |
| Approximately what is the voltage ripple of a three-phase, six-pulse rectified generator? | 13% (Saia, p 283) |
| The automatic brightness control is used to adjust what in fluoroscopy? | kV and mA (Saia, p 284) |
| What are some characteristics of x-rays? | A penetrating effect on all matter & an ionizing effect on air (Saia, p 285) |
| What will occur if the primary beam and the center of a focused grid are not aligned properly? | Grid cutoff & insufficient radiographic density (Saia, p 286) |
| What device is used to change alternating current to a current moving in one direction only? | A solid-state diode (Saia, p 287) |
Created by:
meschnell
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