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Digital Flouroscopy
Digital Radiography: An introduction Chapter 6
| Question | Answer |
|---|---|
| Who developed the first fluoroscope and when? | Thomas Edison 1896 |
| What is conventional fluoroscopy? | Dynamic real-time imaging |
| What are the two types of fluoroscopic equipment? | mobile and stationary |
| What is the typical range of mA used in fluoroscopy? | .5-5 |
| What is the minimum SSD in mobile fluoroscopy imaging? | 12" |
| What is the minimum SSD in fixed fluoroscopy imaging? | 15" |
| What are the three technologies of fluoroscopy? | Direct viewing, Intensifier, Flat Panel |
| The overall goal of _____ ___________ is to reduce patient dose. | pulsed fluoroscopy |
| _____ _________ refers to the brightening of the fluoroscopic image using the image intensifier. | Image Intensification |
| In an image intensifier tube, the ______ _____ is coated with a phosphor that converts x-ray photons to light photons. | input screen |
| The input screen diameter usually falls within the range of __-__ cm. | 13-30 |
| The light from the input screen strikes the ________. | photocathode |
| The photocathode is made of ______ _____. | antimony cesium |
| The light from the input screen strikes the photocathode and emits ________. | photoelectrons |
| The __________ _____ consists of a series of electrodes that accelerate and focus the photoelectrons from the photocathode to the output screen. | electrostatic lenses |
| The output screen is coated with a _____ phosphor. | ZnCdS |
| The _____ ____ converts the photoelectrons into light. | output screen |
| The diameter of the output screen is about __/__ the diameter of the input screen | 1/10 |
| Brightness gain= | Minification gain x flux gain |
| Minification Gain= | Diameter of the input screen/diameter of the output screen |
| Flux gain= | number of light photons at the output screen/number of light photons at the input screen |
| Magnification provides ______ spatial resolution but at the expense of ______ dose to the patient | increased |
| The ____ ____ of an image intensifier tube is the ratio of the image brightness at the periphery to that at the center of the output screen. | contrast ratio |
| ________ refers to a loss of brightness at the periphery of the image | Vignetting |
| ______ _____ is an artifact that results when light is scattered in the intensifier tube. | Veiling glare |
| The ______ the number of bits, the more accurate is the ADC. | higher |
| When you magnify, an image the focal point goes toward the _____ _____. | input screen |
| The ____ is a small ring of metal that provides a strong force toward the output phosphor. | anode |
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