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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| show | a positively charged electrode in the neck of the image intensifier that accelerates the electron stream to the output phosphor by maintaining a constant potential of approximately 25 kV in the tube
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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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| show | automatically adjusts the tube current (mA), voltage (kVp), filtration, and pulse width to maintain radiation exposure to the flat panel detector
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| brightness gain | show 🗑
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| camera tube | show 🗑
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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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| continuous fluoroscopy | show 🗑
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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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| show | a measurement of exposure in air, followed by a computation to estimate absorbed dose to the patient
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| electronic magnification | show 🗑
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| electrostatic focusing lenses | show 🗑
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| show | saves single images or a fluoro sequence loop to memory and are maintained in the patient's permanent record
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| flux gain | show 🗑
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| frame averaging | show 🗑
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| image intensifier | show 🗑
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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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| kerma area product (KAP) | show 🗑
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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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| minification gain | show 🗑
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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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| photocathode | show 🗑
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| show | number of pulses (exposures) that occur per second during fluoroscopic operation
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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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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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