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RADT 465
Image production
| Question | Answer |
|---|---|
| fixed spatial resolution of a direct digital system is fixed on what? | TFT and DEL size Lange Q&A p. 189 |
| What are the components of a DEL (3) | Sensing area, TFT, and capacitor Lange Q&A p. 189 |
| Postprocessing that removes high frequency noise | smoothing Lange Q&A p. 190 |
| what units are used to express resolution (2) | line-spread function, and line pairs per millimeter Lange Q&A p. 191 |
| what system does the radiographer select the anatomic part from the console menu | APR Lange Q&A p. 191 |
| what is photon energy inversely related to | photon wavelength Lange Q&A p. 191 |
| What is the primary function of x-ray beam filtration? | to reduce patient skin dose Lange Q&A p. 192 |
| What is the part of a DEL that functions as a switch/gate? | TFT Lange Q&A p.192 |
| What is subject contrast related to? | Differential tissue absorption, and atomic number of tissues being traversed Lange Q&A p. 193 |
| The term pixel is associated with | two-dimensional, picture element, measured in xy direction. Lange Q&A p.193 |
| what is used to overcome severe variation in patient anatomy or tissue density, providing a more uniform receptor exposure? | Compensating filter Lange Q&A p.194 |
| distance between center of one pixel and the center of an adjacent pixel | pixel pitch Lange Q&A p. 194 |
| analog to digital conversion is required in which imaging system? | CR Lange Q&A p.195 |
| what way does SID affect sharpness of image detail? | Image detail sharpness is directly related to SID Lange Q&A p.196 |
| Kilovoltage selection has an effect on | photon energy and penetration Lange Q&A p.196 |
| foreshortening of a image is a result by | improper part alignment Lange Q&A p.199 |
| misalignment of the tube-part-ir relationship results in | shape distortion. Lange Q&A p.199 |
| what is related to spatial resolution | focal spot size, SID, OID Lange Q&A p.201 |
| reduction in xray photon intensity as it passes through tissue is termed what | attenuation Lange Q&A p.201 |
| scatter radiation has no effect on what? | spatial resolution Lange Q&A p.201 |
| material comprising the IP front | homogeneous/radiolucent Lange Q&A p.201 |
| as window width increases | contrast scale increases Lange Q&A p.202 |
| Ionizing radiation intensity decreases as | distance from the source of radiation increases Lange Q&A p. 202 |
| the xray seen on computer display monitor | analog image Lange Q&A p.203 |
| what is reciprocity law | a particular milliampere seconds value, regardless of the combination of milliamperes and time, will reproduce the same receptor exposure. Lange Q&A p.204 |
| As DEL size decreases | spatial resolution decreases Lange Q&A p.203 |
| Processing algorithm represents | anatomical part and projection Lange Q&A p.205 |
| the line-focus principle expresses the relationship between | the actual and the effective focal spot. Lange Q&A p.207 |
| why is short exposure time essential for a chest xray | to minimize involuntary movement Lange Q&A p.209 |
| windowing describes the practice of | changing the image brightness and/or contrast scale. Lange Q&A p.209 |
| ratio of the pixel's sensing area to the area of the pixel itself | fill factor Lange Q&A p.210 |
| what is a one line pair | one black line on a light background and an interspace of the same width. Lange Q&A p.210 |
| the percentage of remnant/signal photons that are detected and absorbed by the receptor describes what | DQE Lange Q&A p.211 |
| what is the compensating filter used for | even out widely differing tissue densities. Lange Q&A p.211 |
| digital image brightness is controlled by | monitor function and postprocessing functions Lange Q&A p.211 |
| what computer function corrects for exposure errors | rescaling Lange Q&A p.211 |
| unsharp edges of tiny radiographic details | blur Lange Q&A p.233 |
| how often are radiographic equipment collimators required to be evaluated. | semiannually Lange Q&A p.233 |
| what is the relationship between kilovoltage and HVL | as kilovoltage increases, the HVL increases Lange Q&A p.234 |
| As window width decreases | contrast scale decreases Lange Q&A p.235 |
| circuit devices that permit electrons to flow in only one direction are | solid-state diode rectifier Lange Q&A p.235 |
| converts mechanical energy to electrical energy | generator Lange Q&A p.235 |
| evaluated focal spot accuracy as a function of geometric blur | star pattern Lange Q&A p.236 |
| six pulse rectified generator is about what percentage? | 13% Lange Q&A p.236 |
| in fluro, the automatic brightness control is used to adjust what | kilovoltage and milliamperage. Lange Q&A p.237 |
| the amount of electric charge flowing per second | current Lange Q&A p.237 |
| digital imaging subject contrast is the result of | signal differences within the remnant beam Lange Q&A p.238 |
| which of the following functions to increase the milliamperage | increase in heat of the filament Lange Q&A p.239 |
| the image intensifier's input phosphor generally is composed of | cesium iodide Lange Q&A p.240 |
| what xray circuit devices is located in the secondary/high-voltage portion of the xray circuit | milliamperage meter Lange Q&A p.242 |
Created by:
sgambrel02
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