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RADT 456- QC
ARRT registry review covering QC and equipment control
| Question | Answer |
|---|---|
| What type of x-ray tube is designed to turn on and off rapidly, providing multiple short, precise exposures? | Grid-controlled x-ray tube |
| Choke coil and autotransformer both operate on what type of induction? | Self-induction |
| The ___ operates on the principle of mutual induction. | High-voltage transformer |
| When using the smaller field in a dual-field image intensifier, what occurs to the image? | The image is magnified |
| What are radiopaque objects such as pennies or paper clips often used to measure? | The congruence of the x-ray beam with the light field |
| What is the definition of the HVL of a particular beam? | The thickness of a material that will reduce the exposure rate to 1/2 of its original value. It is often used to express the quality of the beam. |
| True or False. KVP and HVL have a direct relationship? | True |
| What device converts electrical energy into mechanical energy? | Motor |
| A ___ converts mechanical energy into electrical energy. | Generator |
| What is a slit camera used to measure? | Focal-spot size and spatial resolution |
| True or False. Most of the primary beam is made up of Characteristic radiation? | False. The majority of the primary beam is Bremsstrahlung radiation. |
| An electron approaching a positive nuclear charge changes direction and loses energy is a description of what? | The production of Bremsstrahlung radiation |
| The percentage of drop from maximum voltage that each pulse of current experiences | Voltage ripple |
| The voltage ripple associated with a three-phase, six-pulse rectified generator is about __%. | 13 % |
| The voltage ripple associated with a three-phase, twelve-pulse generator is about __% voltage ripple | 3.5% |
| True or False. Compton scatter and the photoelectric effect are interactions between x-ray photons and tissue atoms | True |
| What is the anode made of? | Molybdenum disk is coated with tungsten-rhenium alloy |
| Focal spot size, linearity, reproducibility, collimation, filtration, kv and exposure time must be tested how often? | Annually |
| What device is affected when a radiographer selects kvp on the control panel? | Autotransformer |
| What does linearity mean? | A given mAs value, using different MA stations with appropriate exposure time adjustments, will provide consistent intensity |
| The total brightness gain of an image intensifier is the product of ____ & ____. | Flux and minification gain |
| The ratio of the # of x-ray photons at the input phosphor compared to the # of light photons at the output phosphor is termed? | Flux gain |
| How do you calculate heat units for three-phase, twelve-pulse equipment? | MA * time * kVp * 1.41 |
Created by:
kjschapker
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