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
Bontrager chap 25
Conventional Flouroscopy
| Question | Answer |
|---|---|
| Who invented the fluoroscope? | Thomas Edison |
| What year was the fluoroscope invented? | 1896 |
| What kind of studies is the fluoroscope used for (static? dynamic?) | Dynamic |
| At what mA is the xray tube operated at in fluoroscopy | less than 5 mA |
| What are the structures of the eyes responsible for vision | rods and cones |
| which structure of the eye is sensitive to low light (night vision) | rods |
| which structure of the eye is used for daylight vision | cones |
| What receives the incident xray beam after it leaves the patient | image-intensifier tube |
| what is the IIT housed in | glass envelope |
| After the xray beam passes glass, what does it come in contact with | Input phosphor |
| What is the input phosphor made out of | cesium iodide |
| what does the input phosphor do to the xray beam | converts it to visible light |
| what is the next point of interaction after the input phosphor | photocathode |
| what in the input phosphor made out of | cesium and antimony compounds |
| what does the photocathode do when the input phosphor illuminates it | it reacts to the illumination by emitting electrons to anode |
| what is the next point of interaction after the electrons pass the anode | output phosphor |
| what happens to the electrons when they hit the output phosphor | they interact and produce light |
| what is the output phosphor made out of | zinc cadmium sulfide |
| why are there electrostatic focusing lenses and what do they do | because the electron pattern from the cathode is larger than the output phosphor it must be reduced, they control this |
| what is the number of output light photons over the number of input xray photons | flux gain |
| what is the multiplication of minification gain and flux gain | brightness gain |
| what is the ratio of the square of the diameter of the input phosphor to the square of the diameter of the output phosphor | minification gain |
| which type of image intensifier provides greater flexibility in all examinations | multifield image intensifiers |
| what is the most common trifield tube size | 25/17/12 |
| what is the reduction of brightness at the periphery of an image | vignetting |
| which television camera tube is most often used in television flouro | vidicon |
| what is a significant advantage to television monitoring | brightness level and contrast can be controlled electronically |
| what structure converts the light signal from the output phosphor to an electrical signal | television camera tube or CCD |
| what component is a heated filament that supplies constant electron current by thermionic emission | electron gun |
| in digital flouro what is the mA operated at | its measured in hundreds of mA instead of less than 5 mA |
| what is the time required for the xray tube to switch on | interrogation time |
| what is the time required for the xray tube to switch off | extinction time |
| What does DF use instead of a TV camera tube | charged couple device |
| what is the CCD made of | crystalline silicon |
| What makes the silicon in the CCD produce an electric charge | when the silicon is illuminated |
| what is the principal advantage of CCDs | small focal size, ruggedness |
| Name the advantages of CCD | high spatial res, high SNR, high DQE, no warm up time, no lag, no spatial distortion, no maintenance, unlimited life, unaffected by mag fields, linear response, lower patient dose |
| name the advantages of flat panel image receptor over CCD | distortion free, High DQE, rectangular, improved contrast res, unaffected by mag fields |
| what is progressive mode | when the electron beam of the TV cam tube sweeps the target assembly continuously from top to bottom |
| what is replacing the cathode ray tube | flat panel image display |
| which type of subtraction is where an image obtained at one time is subtracted from an image obtained at another time | temporal subtraction |
| what is the initial x-ray pulsed exposure that is made | mask image |
| what is an 18 gauge hollow needle with stylet | Seldinger needle |
| which catheter is used for the femoral artery | H1 headhunter Hinck |
| which catheter has a gentle curve used for celiac, renal, and mesenteric arteries | c2, cobra |
| what are pigtail catheters used for | injecting contrast into a bouls |
| what are the risks to an arteriogram | continued bleeding, reaction, blood clot, penetration |
| what are some modifications on the xray tube for interventional radiography | small target angle, massive anode to withstand high heats |
| what are some modifications on the high voltage generator for IR | 12 pulse power capable of 100kW with low ripple |
Created by:
marylgs145
Popular Radiology sets