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IEO Quiz4
Marys Q4 ImgEqS22
| Question | Answer |
|---|---|
| The ratio of incident x-rays on the input phosphor to light photons exiting the output phosphor is called ____gain | Flux |
| A charge-coupled device used in digital fluoroscopy provides high | Spatial resolution, S/N ratio, DQE |
| The ___in the retina are stimulated by ___light, the ___are stimulated by ___light | rods, low, cones, bright |
| Brightness gain is typically in the range of_____ | 5,000-30,000 |
| Fluoroscopy for an air contrast barium enema is generally done at ____kVp | 80-90 |
| Digital fluoroscopic rate is lower than that for continuous analog fluoroscopy-T/F | True |
| Digital fluoroscopy with a charge-couple device has lower ____and higher ____ than conventional fluoroscopy | patient dose, light sensitivity |
| What factor increases when the kinetic energy across the image intensifier increases | Voltage |
| What affect will using a smaller input phosphor have on magnification | increase |
| What affect will using a smaller input phosphor have on detail | increase |
| The combination of temporal and energy subtraction techniques is called ____ | Hybrid subtraction |
| The kinetic energy of photoelectrons in the image intensifier is greatly increased by the ____ | potential difference across the tube |
| The output phosphor of the image intensifier is composed of | zinc cadmium sulfide |
| The time it takes to turn on the digital fluoroscopy x-ray tube and reach selected mA and kVp is the ____time | Interrogation |
| Fluoroscopy was developed so that radiologists could view ____images | dynamic |
| Electrons hit the ____after exiting the anode | output phosphor |
| The ___in the image intensifier emits electrons when it's stimulated by light photons | Photocathode |
| The ____is the product of minification gain and flux gain | brightness gain |
| Who invented the fluoroscope | Thomas Edison |
| With image intensification the light level is raised to____vision | Photopic |
| x-rays that exit the patient and enter the image intensifier first interact with the ___ | input phosphor |
| Viewing the fluoroscopic image in magnification mode increases___ | contrast resolution, spatial resolution, and patient dose |
| What affect will using magnification have on dose | increase |
| An image intensifier tube is identified by the diameter of its___ | input phosphor |
| The image intensifier improved fluoroscopy by increasing image____ | brightness |
| What is the milliamperage used during fluoroscopy | 5 mA |
| Automatic brightness control maintains the brightness of the image by varying____ | kVp and mA |
| The input phosphor converts___to ____ | x-rays, light |
| Describe purpose of electrostatic lenses | guides the electrons |
| Light produced at the output phosphor of the image intensifier has been increased ___times in intensity | 50-75 |
| Digital fluoroscopy uses at least ___monitor(s) | 2 |
| The capability of an image intensifier to increase the illumination level of the image is called its____ | brightness gain |
| What is the purpose of fluoroscopy | Image in motion |
Created by:
Levanw