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Fluoroscopy Review
Fluro
| Question | Answer |
|---|---|
| The fluoroscopic mA range is _____ to _____. | 0.5 to 5.0 mA |
| Modern image intensifiers are capable of increase image brightness ______ to ______ times. | 5,000 - 8,000 |
| The input fluorescent screen _______ x-ray photons and _____ light photons. | absorbs, emits |
| The photocathode ______ light photons and ____ electrons. | absorbs, emits |
| Electrostatic lenses are used to ______ and ____ electrons. | accelerate, focus |
| The output fluorescent screen ______ electrons and ____ light photons. | absorbs, emits |
| Photoemissive materials absorb light photons and emit electrons in a process called _____________. | Photoemission |
| __________ _________ are a series of charged electrodes located inside the glad envelope of the image intensification tube. | Electrostatic lenses |
| Total brightness gain is determined by ____________ and ________________. | Minification gain, flux gain |
| __________ _________ is an increase in brightness or intensity. | Minification gain |
| __________ _______________ is a measurement of the increase in light photons due to conversion efficiency of the output screen. | Flux gain |
| The primary limitation on most fluoroscopic resolution is the ________ ______ _________ of the video monitor. | 525-line raster |
| Fluoroscopic video cameras used a _________ or _______ or a _______________. | Vidicon, Plumbicon tube, CCD |
| Vidicon tubes use ____________ ______________. | Antimony Trisulfide |
| Plumbicon tubes use ________ __________. | Lead oxide |
| _______ and _______ film formats are used for cine film imaging. | 16 mm, 35 mm |
| _________ is the edge distortion problem in image intensification tubes. | Vignetting |
| The charge of the electrostatic lenses is ________. | Negative |
| The anode is ____________ charged and is normally supplied with about ____ kv. | Positively, 25 |
| Minification gain is calculated as _______ _____ ________ divided by _________ ________ ________. | Input screen diameter, output screen diameter |
| Flux gain is calculated as number of ______ ___ _______ divided by number of _________ _________ __________. | Output light photons, Input xray photons |
| Sensitivity to low light and used in night vision is attributed to ______. | Rods |
| Sensitivity to light, responsible for daylight vision is attributed to _______. | Cones |
| Daylight vision. | Phototopic |
| Night vision | Scotopic |
| Cones are most sensitve to _________ light. | Yellow |
| Rods are most sensitive to ________ light. | Green |
| The input fluorescent screen is coated with ________ _________. | Cesium Iodide |
| Th electrostatic lenses are a series of ________ __________ located inside the glass envelope of the intensification tube. | charged electrodes |
| The intensification tube's anode is ________ charged and supplied with about ____ kV. | Positively, 25 |
| The output fluorescent screen is a silver-activiated, _____ __________ ______ phosphor | Zinc-Cadmium sulfide |
| Automatic brightness control does what? | Maintains the brightness of the image by automatically adjusting exposure factors acording to subject density and contrast. |
| The most common solution for quantum mottle is? | Increase mAs |
| The function of the image intensfier is? | To absorb x-ray photon and emit light photons. |
Created by:
rad1958tech