Ch 26, 27 Digital radiography/fluoro
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| What improves spatial resolution but also increases patient dosage? | reduced pixel size
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| When was digital radiography first used in a clinical setting? | 1980's
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| Photodiodes and ________ are light sensitive devices that collect ________ ___________. | CCD's, light photons
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| Pixel size limits ____________ ___________. | spatial resolution
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| What portion of the beam contributes to the image? | 80 %
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| What is the fill factor ratio? | 80 % contributes to the film, 20 % doesn't
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| Scanned projection radiography results in better contrast but limited _______ __________. | spatial resolution
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| _________ _________ is the capture element in CR. | photostimulable phosphor
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| The CCD is the _________ _________ _________ used in digital cameras and surveillance cameras. | light sensitive element
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| When the CCD can respond to very low levels of visible light, this is said to be____________. | sensitivity
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| The dynamic range of the CCD is able to respond to a wide range of ________ __________. | light intensities
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| How big is a CCD? | 1 to 2 cm in size
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| The coupling device transfers the __________________ to the collection element. | x-ray generated signal
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| The way in which the x-ray is recorded? | capture element
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| ____, __________, or __________ can be collection elements. | photodiode, CCD, thin-film transistor
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| What determines the speed in screen-film radiography? | gadolinium oxysulfide thickness
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| In digital fluoroscopy, the patients dose ________ with the use of a CCD. | decreases
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| Digital Fluoroscopy is a digital x-ray imaging system that produces _______ __________ obtained within an ___________________. | dynamic images, area x-ray beam
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| Energy and temporal are types of what? | digital subtraction methods
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| What are the 3 advantages the CCD has in in imaging? | sensitivity, size, and dynamic range
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| Name some principal usages the CCD provides in digital fluoroscopy imaging. | high spatial reolution, unlimited life, high SNR, no warm up required, lower pt dose
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| In DR, spatial resolution is determined by _____________ and _______________. | pixel size, image intensifier size
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| Crystalline silicon is used for what purpose? | Its the sensitive component of the CCD
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| What is the main concern in hybrid imaging? | pt's movement
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| Hybrid uses _______ and ______ subtraction. | temporal, energy
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| Digital fluoro with a CCD added produces higher _______ __________ than regular x-ray. | light sensitivity
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| What are the indirect DR processes? | cesium iodide/CCD and cesium iodide/amorphous silicon (CsI/CCD, CsI/a-Si)
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| What is an indirect process in DR? | x-rays are first converted to light then to an electrical signal
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| When was digital mammo promoted? | In the 1990's
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| What is the direct process in DR called? | Amorphous selenium( a-Se)
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| What is a direct capture in DR? | the beam interacts directly with the a-Se to produce the electric signal
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| What 2 In DR, what 2 elements have the same properties and principles? | cesium iodide/amorphous silicon, gadolinium oxysulfide
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| The ______________________ is easier to view and manipulate, provides better images, and is replacing the Cathode tube ray? | Flat panel imaging display or FPID
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| What is the DF system controlled primarily by? | image matrix size, system dynamic range, image acquisition rate
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