Chapter 15: Fluoroscopic Imaging
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| accelerating anode | show 🗑
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| air kerma | show 🗑
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| show | a device that takes the analog signal and divides it into a series of bits (1s and 0s) that the computer "understands"
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| show | function of the fluoroscopic unit that maintains the overall appearance of the fluoroscopic image by automatically adjusting the kVp, mA or both
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| automatic exposure rate control (AERC) | show 🗑
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| brightness gain | show 🗑
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| show | one of the two common devices used in a fluoroscopic system to convert the light image from the output phosphor to an electronic signal for display on a television monitor
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| show | a light-sensitive semiconducting device that generates an electrical charge when stimulated by light and stores this charge in a capacitor
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| show | type of fluoroscopy that uses a continuous beam of radiation and could deliver larger doses of radiation to the patient than pulsed fluoroscopy
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| show | an expression of the luminance at the output phosphor divided by the the input exposure rate; its unit of measure is the candela per square meter per milliroentgen per second
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| dose area product (DAP) | show 🗑
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| electronic magnification | show 🗑
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| show | negatively charged plates along the length of the image-intensifier tube that repel the electron stream, focusing it on the small output phosphor
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| fluoro loop save | show 🗑
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| flux gain | show 🗑
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| frame averaging | show 🗑
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| show | an electronic vacuum tube used in fluoroscopy that converts the remnant beam to light, then electrons, then back to light, increasing the light intensity in the process
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| show | a layer of the image intensifier made of cesium iodide and bonded to the curved surface of the tube itself; it absorbs the remnant x-ray photon energy and emits light in response
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| show | the same as DAP; the product of the total air kerma and the area of the x-ray beam at the entrance of the patient
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| last image hold (LIH) | show 🗑
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| show | a function of the fluoroscopic unit that increases the voltage to the electrostatic focusing lenses, resulting in only those electrons from the center area of the input phosphor interacting with the output phosphor and contributing to the image
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| show | an expression of the degree to which the image is minified (made smaller) from input phosphor to output phosphor
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| show | a layer in the image intensifier that absorbs the electron stream and emits light in response
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| show | a layer in the image intensifier made of cesium and antimony compounds; these metals emit electrons in response to light stimulus
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| pulse rate | show 🗑
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| show | length of each pulse (length of exposure) during fluoroscopic operation
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| pulsed fluoroscopy | show 🗑
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| spatial resolution | show 🗑
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| virtual collimation | show 🗑
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