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RADT465: Equip.& QC
ARRT registry review covering Equipment Operation and Quality Control
| Question | Answer |
|---|---|
| What constitutes the largest man-made source of ionizing radiation? | Diagnostic x-rays |
| How much do exams conducted with intensifying screens reduce the exposure to a patient? | By 95 percent |
| How often should x-ray equipment be checked for linearity and reproducibility? | Annually |
| What is the SI unit for effective dose? | Sievert (Sv) |
| Which x-ray production occurs when an electron changes direction and loses energy? | Bremsstrahlung |
| MRI, CT, and CR are examples of which type of imaging? | Digital imaging |
| A CT gantry includes what? | High voltage generator, multidetector array, and an x-ray tube |
| What determines the heat capacity of an x-ray tube target? | The rotation of the anode, the diameter of the anode, and the size of the focal spot |
| What is a phototimer? | A device that allows automatic exposure control and terminates an exposure once the IR has been correctly exposed |
| What is thermionic emission? | Emission of electrons from a heated surface (the electron cloud in an x-ray tube) |
| How does AEC work? | A parallel-plate ionization chamber receives a particular as x-ray photons travel through it |
| How can radiologic technologists increase the effective energy of the x-ray beam? | Increase the added filtration and increase the kV |
| What is automatic brightness control? | Feature on a fluoroscope that allows the radiologist to select an image-brightness level that is maintained automatically by varying the kVp, the mAs, or both. |
| Cracking of an anode or rotor-bearing damage could be the result of what? | Delivering large exposures to a cold anode and exceeding a tube's exposure limitation |
| What is the relationship between kV and HVL? | As kV increases, so does HVL |
| When window level increases, what else increases? | Brightness |
| What are solid-state diodes? | Circuit devices that permit the flow of electrons in only one direction |
| What are the functions of the AEC back-up timer? | Protects the patient from overexposure and protects the x-ray tube from excessive heat |
| What is a generator? | Coverts mechanical energy into electrical energy |
| What is a slit camera used to measure? | focal-spot size and spatial resolution |
| What does a grid-controlled x-ray tube do? | Turns on and off rapidly, providing multiple short, precise exposures |
| Why is tungsten a useful element in x-ray production? | Dissipates heat well, has a high melting point and high atomic number |
| What is the voltage ripple for a three-phase, 12-pulse rectified generator? | 13 percent voltage ripple |
| An image intensifier includes what? | The photocathode, the focusing lenses, and the accelerating anode |
| Which device controls voltage by varying resistance? | A rheostat |
| What is quality control? | The regular measurement and evaluation of radiographic equipment components and their performance |
| A QC program checks what? | Reproducibility, linearity, and positive beam limitation/automatic collimation |
| What are the three steps to an acceptable QC program? | Acceptance testing, routine performance monitoring, and maintenance |
| The misalignment of the x-ray field and the light field to the collimator must not exceed what percentage of the SID? | 2 percent of the SID |
| What are the three tools used for measurement of focal-spot size? | The pinhole camera, the star pattern, and the slit camera |
| For a kilovolt peak calibration, the measure kVp should be within what percentage of the indicated kVp? | 10 percent |
Created by:
mmaldridge
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