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Image Acquisition
| Question | Answer |
|---|---|
| The component of a CR image plate that records the radiologic image is | photostimulable phospor |
| the luminescent light emitted by the PSP is transformed into the image seen on the CRT by the | ADC (analog to digital converter) |
| SId affects recorded detail in which of the following ways? | directly related |
| Grid interspace material is made up of what? | Aluminum and plastic fiber |
| In a duration of 0.05 second was selected for an exposure what mA would be necessary to produce 30 mAs? | 600 mA |
| Unopened boxes of radiographic film should be stored away from radiation and | in the vertical position |
| The term windowing describes the practice of | changing the image brightness and/or contrast scale |
| foreshortening can be caused by | the radiographic object being placed at an angle to the IR |
| what does not affect the exposure rate of the primary beam? | field size |
| a patient with Congestive heart failure has to have what done to the technique for a PA chest Xray? | Increase |
| Misalignment of the tube-part-IR relationship results in | shape distortion |
| the direction of electron travel in the xray tube is | cathode to anode |
| for the same FOV the spatial resolution will be improved using | a larger matrix |
| which of the following technical change would best serve to remedy the effect of very dissimilar tissue densities | high KV exposure factors |
| the absorption of useful radiation by a grid is called | grid cutoff |
| during CR imaging, the latent image present on the PSP is changed to a computerized image by the | ADC |
| How are mAs and patient dose related? | directly |
| the reduction in xray photon intensity as the photon passes through material is termed | attenuation |
| diagnostic xrays are generally associated with | high frequency and short wavelength |
| At what portion of the xray beam is the effective focal spot the largest? | at the cathode end |
| the intensity of ionizing radiation decreases as | distance from the source of radiation increases |
| what is the purpose of the thin layer of lead that is often location in the rear portion of the IP | to prevent scatter radiation |
| the purpose of the electroconductive layer of the CR PSP plate is to | facilitate transportation through the scanner/reader |
| the xray image seen on the computer display monitor is a | digital image |
| the accessory used to measure the thickness of body parts in order to determine optimal selection of exposure factors is the | caliper |
| a radiograph made with a parallel grid demonstrates decreased density on its lateral edges. this is most likely due to | decreased SID |
| a particular mAs value, regardless of the combination of the mA and time, will reproduce the same radiographic density, this is a statement of the | reciprocity law |
| the relationship between the height of a grid's lead strips and the distance between them is referred to as grid | ratio |
| because of the anode heel effect the intensity of the xray beam is greatest along the | cathode end of the beam |
| in digital imaging, TFT DEL size is related to | spatial resolution |
Created by:
jfwoodard
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