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RADT 465
Image Production
| Question | Answer |
|---|---|
| When FOV decreases in image intensification | mA increases, output screen image is magnified and has improved resolution (pg 217) |
| The autotransformer and kV meter are on what side of the x-ray circuit? | primary/low voltage side (pg 217 |
| What term is used for unsharp edges of tiny radiographic details? | blur (pg 218) |
| Radiographic equipment collimators need to be evaluated how often? | semiannually (pg 218) |
| Flat-panel fluoroscopy advantages over a image-intensified fluoroscopy are | eliminates need for ADC, smaller size and weight, greater maneuverability (pg 218) |
| A thin input phosphor layer will improve what on images? | spatial resolution (pg 218) |
| Scintillation involves what three materials | amorphous silicon, cesium iodide, gadolinium oxysulfide (pg 219) |
| solid-state- diode rectifiers circuit devices permits electrons to flow in how many directions | one direction (pg 219) |
| What does the AEC do | it's a parallel-plate ionization chamber that receives a charge when x-ray photons travel through it (pg 218) |
| When contrast scale deceases what happens to the window width | it decreases (pg 219) |
| If the kilovoltage increases, what happens to the HVL | HVL increases (pg 219) |
| Why is the a backup timer function for the AEC | to protect the x-ray tube from excessive heat the to protect the patient from being overexposed (pg 219) |
| What material is the filament made of | tungsten (pg 219) |
| What does a generator do | a device that converts mechanical energy to electrical (pg 220) |
| What is inherent filtration | filtering effect of the x-ray tube involving the glass envelope and the oil coolant (pg 220) |
| Focal spot size and spatial resolution are used to measure what | slit camera (pg 220) |
| What does a star pattern do | evaluates focal spot size accuracy as a function of geometric blur (pg 220) |
| If it is a three phase six pulse rectifier generator, what is the voltage ripple | 13% (pg 220) |
| The photocathode, the focusing lenses, and the accelerating anode are components of what | image intensifier (pg 220) |
| What causing pitting in the anode focal track | repeated, frequent overloading (pg 220) |
| What does the automatic brightness control adjust | kV and mA (pg 221) |
| How often is radiographic equipment checked for linearity and reproducibility | annually (pg 221) |
| Image intensifier tube's input phosphor functions to convert xrays into what | light (pg 221) |
| Signal differences within the remnant beam is | subject contrast (pg 221) |
| What is quality control used for | evaluates the radiographic equipment's performance (pg 221) |
| Explain Bremsstrahlung radiation | this is when a high speed electron decelerates as it is attracted to a tungsten atom nucleus (pg 221) |
| What are the characteristics of tungsten | dissipation of heat, high melting point, and high atomic number (pg 220) |
| Explain the term current | amount of electric charge flowing per second (pg 221) |
| Flux gain and minification gain are the product of | total brightness gain (pg 222) |
| Increase in heat of the filament results when what is increased | milliamperage (pg 222) |
| What decreases when spatial resolution increases | PSP crystal size and laser beam size (pg 223) |
| When should a grid be used | using high kV and radiographing a large or dense body part (pg 223) |
| What is the image intensifier's input phosphor made of | cesium iodide (pg 224) |
| What can the grid interspace be made of | aluminum and plastic fiber (pg 224) |
| What three things can effect brightness level | milliamperage, kilovoltage, and patient thickness (pg 224) |
| What is adjusted when a radiographer selects kilovoltage on the control panel | autotransformer (pg 224) |
| The line-focus principle, the heel effect, and focal track all are involved with what | anode (pg 225) |
| Where is the rotor located | located within the x-ray tube glass envelope (pg 225) |
| The milliamperage meter is located on which side of the x-ray circuit | secondary/high-voltage portion (pg 225) |
| What does the image intensifier do | it receives the remnant beam and converts it to light along with increasing the brightness (pg 226) |
| What three factors effect the efficiency performance of a grid | grid ratio, number of lead strips per inch, and amount of scatter transmitted through the grid (pg 226) |
| What happens to the image when using the smaller field in a dual field image intensifier | the image in magnified (pg 226) |
| What does smoothing do to an x-ray image | removes image noise (pg 227) |
| The severity of the heel effect, focal spot size, and heat-load capacity all will be effected by | the anode angle (pg 227) |
| What are star and wye configurations related to | three phase transformer (pg 228) |
| What is grid cutoff | undesirable absorption of x-ray beams (pg 229) |
| What is PSP used with | CR (pg 229) |
| What material can the image plate be made of | carbon fiber and magnesium (pg 229) |
| Define pulse rate | number of exposures per second in fluoroscopy (pg 229) |
| When the kilovoltage increases what also increases | the exposure rate (pg 229) |
| Citation for all flashcards: Saia, D.A. (2021). Lange Q&A: Radiography Examination (12th ed.). McGraw-Hill |
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