ARRT registry review over equipment operation, quality control, and image acq.
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| What does the AC supply do for the x-ray circuit? | it is an alternating current that supplies the circuit with 220-2040 voltage.
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| What does the master wall switch do? | It acts as the connection between the external power source to the x-ray unit.
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| What do the fuses do? | They act as a safety feature to stop the connection between the external power source and x-ray unit if the power surges to hazardous levels.
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| What does the line voltage compensator do? | It selects the number of turns on the autotransformer.
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| What does the line voltage meter do? | It measures the voltage entering the x-ray unit.
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| What does the autotransformer do? | It makes minor adjustments to the voltage.
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| What do the major and minor kvp selectors do? | they make either major or minor adjustments to the voltage.
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| What does the pre-reading kv meter do? | It tells the technologist what kv has been selected and what they will get on the secondary side of the circuit.
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| What does the exposure switch do? | closes the circuit connections between the autotransformer and step-transformer. The dead man switch shuts off the voltage if the technologist were to release pressure during exposure.
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| What does the exposure timer circuit do? | it controls the duration of exposure.
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| How many types of exposure timers are there and what are they called? | There are five and they are called Mechanical, Synchronous, Electrical, AEC, and mAs.
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| What does the mA selector do? | It transforms amperage to milliamperage.
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| What does the focal spot selector do? | it selects either a small or large focal spot depending on the mA selector.
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| What does the step-down transformer do? | it runs on mutual induction and transforms voltage into smaller voltage.
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| What does the filament circuit do? | It controls how many electrons will be boiled off the filament wire.
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| What does the step-up transformer do? | It runs on mutual induction and converts volts into kilovolts.
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| What do the diodes of rectification do? | They transform the alternating current into a direct current.
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| What does the mA meter do? | It measures the direct current created by the diodes of rectification.
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| What does the primary/low voltage side consist of? | It includes the AC supply, master wall switch, fuses, line voltage meter, line meter compensator, autotransformer, major/minor kvp selectors, pre-reading kvp meter, exposure timer circuit, and exposure switch.
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| What does the secondary/high voltage side consist of? | It includes half of the step-up transformer, diodes of rectification, mA meter, ground, anode, and cathode.
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| What does the anode do? | it becomes positive and catches repelled electrons.
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| What does the cathode do? | It becomes negative and repels electrons toward the anode.
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| What part of the detector element stores electrical charges? | The capacitor.
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| In direct digital systems, the fixed spatial resolution is determined by? | TFT and DEL size.
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| What post-processing function removes noise? | smoothing.
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| What is pixel pitch? | The distance between the center of one pixel and the next.
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| What end of the x-ray tube has the greatest intensity? | The cathode.
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| What does the term linearity mean? | It refers to experiencing consistency in receptor exposure while utilizing different mA stations.
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| What is the front of the image plate made of? | It is made of carbon fiber and magnesium.
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| What relationship do mAs and patient exposure have? | A directly proportional relationship.
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| What is foreshortening caused by? | It is caused by part misalignment.
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| What causes shape distortion? | It is caused by misalignment of the tube, part, and image receptor.
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| What can evaluate geometric blur? | A star pattern test, slit camera or pin hole camera.
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| What is attenuation defined as? | a decrease in x-ray intensity as it is absorbed by tissue.
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| What does scatter radiation have no effect on? | Spatial resolution.
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| How often are collimators evaluated? | Semi-annually.
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| Scintillation occurs with what materials? | amorphous silicon, cesium iodide, gadolinium oxysulfide.
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| What device in the x-ray tube converts mechanical energy into electrical? | the generator.
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| What causes pitting on the anode track? | repeated overloading.
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| what is used to evaluate focal spot accuracy? | A star pattern test.
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| What is the voltage of a three-phase, six pulse generator? | 13%.
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| What interaction occurs when an electron decelerates as it is attracted to an atom nucleus? | Bremsstrahlung.
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| How often are linearity and reproducibility checked? | Annually.
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| What is quality control defined as? | The routine evaluation of radiographic equipment performance.
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| What does automatic brightness control adjust in fluoroscopy? | kVp and mAs.
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| How often is kilovoltage evaluated? | Annually.
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| In the Image Intensifier, what does the input phosphor do? | It converts x-rays into light.
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| What is the input phosphor made of? | cesium iodide.
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| What device ensures reproducibility of radiographs? | The AEC.
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| Where are photostimulable phosphors (PSP) used? | Computer radiography cassettes.
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| What materials are used for the front of the image plate? | carbon fiber and magnesium.
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