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What improves spatial resolution but also increases patient dosage?
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When was digital radiography first used in a clinical setting?
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Bushong ch 26,27
Ch 26, 27 Digital radiography/fluoro
| Question | Answer |
|---|---|
| What improves spatial resolution but also increases patient dosage? | reduced pixel size |
| When was digital radiography first used in a clinical setting? | 1980's |
| Photodiodes and ________ are light sensitive devices that collect ________ ___________. | CCD's, light photons |
| Pixel size limits ____________ ___________. | spatial resolution |
| What portion of the beam contributes to the image? | 80 % |
| What is the fill factor ratio? | 80 % contributes to the film, 20 % doesn't |
| Scanned projection radiography results in better contrast but limited _______ __________. | spatial resolution |
| _________ _________ is the capture element in CR. | photostimulable phosphor |
| The CCD is the _________ _________ _________ used in digital cameras and surveillance cameras. | light sensitive element |
| When the CCD can respond to very low levels of visible light, this is said to be____________. | sensitivity |
| The dynamic range of the CCD is able to respond to a wide range of ________ __________. | light intensities |
| How big is a CCD? | 1 to 2 cm in size |
| The coupling device transfers the __________________ to the collection element. | x-ray generated signal |
| The way in which the x-ray is recorded? | capture element |
| ____, __________, or __________ can be collection elements. | photodiode, CCD, thin-film transistor |
| What determines the speed in screen-film radiography? | gadolinium oxysulfide thickness |
| In digital fluoroscopy, the patients dose ________ with the use of a CCD. | decreases |
| Digital Fluoroscopy is a digital x-ray imaging system that produces _______ __________ obtained within an ___________________. | dynamic images, area x-ray beam |
| Energy and temporal are types of what? | digital subtraction methods |
| What are the 3 advantages the CCD has in in imaging? | sensitivity, size, and dynamic range |
| 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 |
| In DR, spatial resolution is determined by _____________ and _______________. | pixel size, image intensifier size |
| Crystalline silicon is used for what purpose? | Its the sensitive component of the CCD |
| What is the main concern in hybrid imaging? | pt's movement |
| Hybrid uses _______ and ______ subtraction. | temporal, energy |
| Digital fluoro with a CCD added produces higher _______ __________ than regular x-ray. | light sensitivity |
| What are the indirect DR processes? | cesium iodide/CCD and cesium iodide/amorphous silicon (CsI/CCD, CsI/a-Si) |
| What is an indirect process in DR? | x-rays are first converted to light then to an electrical signal |
| When was digital mammo promoted? | In the 1990's |
| What is the direct process in DR called? | Amorphous selenium( a-Se) |
| What is a direct capture in DR? | the beam interacts directly with the a-Se to produce the electric signal |
| What 2 In DR, what 2 elements have the same properties and principles? | cesium iodide/amorphous silicon, gadolinium oxysulfide |
| The ______________________ is easier to view and manipulate, provides better images, and is replacing the Cathode tube ray? | Flat panel imaging display or FPID |
| What is the DF system controlled primarily by? | image matrix size, system dynamic range, image acquisition rate |
Created by:
radgirl37
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