Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
142 Test 4 Review
Part 1, generator, fluoro
| Question | Answer |
|---|---|
| A generator provides power to X-ray tube. What are the three ways this is done? | Single-phase Three-phase High-frequency phase |
| How to calculate # of dots on a single-phase machine | 120 x time (in seconds) |
| How to calculate degree of arc on a three-phase machine | 360 x time (in seconds) |
| Tube Reading Chart If intersects above the kvp line it is considered safe or unsafe? | Unsafe |
| Tube Reading Chart If intersects below the kvp line it is considered safe or unsafe? | Safe |
| Image intensification process | 1. Exit radiation interacts with input phosphor & converts to visible light 2. Light is converted to electrons by photocathode 3. Electrons are focused by focusing lenses & accelerate toward anode to strike the output phosphor to create a Brighter image |
| Brightness gain | Accelerated electrons create a brighter image Product of flux gain & minification gain |
| Flux gain | Accelerated electrons increase light intensities |
| Minification gain | Reduction in size of output phosphor image compared to input phosphor image |
| Magnification mode increases what? | Visualization of smaller structures Patient dose |
| Fluoro SHAPE distortion | Curved shape, pincushion appearance |
| Fluoro VIGNETTING distortion | Loss of brightness around periphery |
| Fluoro NOISE distortion | Grainy; insufficient information present |
| Viewing systems How to view the image from output phosphor | Must first be converted into electrical signal via television camera |
| TV Camera What is a camera tube? | Encloses an electron gun & photoconductive target assembly |
| TV Camera What is a CCD? | A light sensitive semiconducting decive |
| TV Camera CCD Advantages: | 1. More sensitive to wider range of light 2. No geometric distortion 3. Smaller |
| Display monitors & description | CRT: electron gun scans phosphor layer inside of glass front LCD: several layers of liquid crystal Plasma: thin layers of pixels |
| 3 types of recording systems | Cassette spot filming Film/photospot camera Videotape/DVD recording |
| Digital fluoro adds ________ | ADC & computer between TV camera & monitor |
| Newer digital fluoro advantages | 1. lighter & more compact 2. produces signal directly 3. Better contrast resolution 4. Less noise |
| Continuous exposure produces _____ frames of images each second | 30 |
| Pulsed exposure produces _____ frames of images each second | 7 |
| Intensity of x-ray exposure at TT should not exceed ____ R/min WITH automatic brightness control | 10 |
| Intensity of x-ray exposure at TT should not exceed ____ R/min WITHOUT automatic brightness control | 5 |
| Source to skin (SSD) should be no less than ____ inches for stationary fluoro units | 15" |
| Source to skin (SSD) should be no less than ____ inches for mobile fluoro units | 12" |
Created by:
dakotaheaston1
Popular Radiology sets