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PRE 1 Chap 36
Fluoroscopy
| Question | Answer |
|---|---|
| who and when was invented fluoroscopic | thomas Edison 1896 |
| what is The primary function of a fluoroscope – | is to provide real time dynamic image of anatomic structures |
| is fluro a dynamic or static study | dynamic |
| what is the mA range for fluoroscopic x ray tubes | .5. - 5.0mA |
| is pt dose higher or lower in fluro and why | higher, bc of the length of the procedure |
| what is min SOD in fixed fluro | 15" |
| what is min SID in mobile units | 12" |
| what is ABC | automatic brightness control |
| what is the disadvantage to using the magnification mode in fluro | pt receives additiona dose |
| what is the milliamperage used during fluro | < 5mA.( Less than 5mA ) |
| which of the following hs the possiablity of demonstrating veiling glare and pincushion distortion | conventional image intensifier |
| what is the energy sequence during image intensified fluroscopy | xray to light to electrons to light |
| the ___absorbs electrons and emits light | output screen |
| electrons hit the ______after exiting the anode | output phosphor |
| define vignetting | a loss of brightness around the edge of the fluoroscopic image due to the curve of the photocathode |
| what is brightnesss gain | the capability of an image intensifier to increase illumination level of the image |
| what is formula for the amount of magnification created when in magnification mode | MF= full size input phosphor / selected input phosphor |
| what is the formula for brightness gain | minifcation gain x flux gain |
| what is vidicon | old camera tube |
| true or false television monitoring does NOT allow brightness and contrast to be controlled electronically | false |
| what part of the image intensifier converts remnant X-ray beams into light photons | the input phosphor |
| in terms of resolution, which is the weakest part of the fluoroscopic system | TV monitor |
| when operated in magnification mode, the electrostatic lens have ____ of a negative charge | more |
| what part of the image intensifier absorbs light and produces electrons | photocathode |
| the ability of the eye to detect differences in brightness levels is | contrast perception |
| the electron gun in the monitor moves in the same ______pattern as the electron gun in the tube camera | raster |
| visual acuity in the eye is greatest at the ______ where ______ are concentrated | fovea centralis cones |
| the image intensifier improved fluoroscopy by increasing image ___ | brightness |
| _______ imaging is accomplished with fluoroscopy as opposed to radiography | Dynamic |
| the SSD should be no less than ____ for fixed or stationary fluoroscopic units and no less than ____ for mobile unites | 38cm; 30cm |
| the input phosphor is _____ than the output phosphor | larger |
| The brighter the image the _____ the image | smaller |
| what is the minimum gauge a lead apron should be | .5mm |
| what should you do to reduce Quantium mottle | increase mA caused by to little exposure |
| what is flux gain | measurement of the increase in light photons due to the conversion efficiency of the output screen |
| what is the minifacation formula | D1/D2 squared or input screen diameter (2) over output screen diameter (2) |
| where is the anode positioned in the glass envelope | immediately in front of the output screen |
| what is visual acuity | ability to see detail |
| what is the structure in the eye responsible for vision | cones and rods |
| what kind of vision is sensitive to low light and night vision | scotopic vision |
| is fovea contrails responsible for cones or rods ONLY | cones only |
| what kind of vision is responsible for bright light and color vision | photopic vision |
| which is better at detecting differences in brightness levels, cones or rods | cones |
| what year was the image intensifier introduced | 1948 |
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