Digital Radiography and PACS
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| show | testing that occurs to ensure equipment or processes are functioning within acceptable limits
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| show | historical collection of images stored in PACS
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| show | software function that allows historical information to be gathered from digital storage, i.e. multiple exams, range of dates, or by pathology
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| aspect ratio | show 🗑
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| automatic data recognition | show 🗑
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| show | occurs when exposure is greater or less than the optimal amount to produce a diagnostic image; it is the effort of the computer to "fix" exposure errors
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| backing layer | show 🗑
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| barium fluorohalide | show 🗑
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| basic input/output system (BIOS) | show 🗑
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| show | small chip found on the motherboard that manipulates data sent from a program; brains of the computer
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| show | newer type of amorphous silicon detector that uses this; scintillator is made by growing very thin crystalline needles (5 μm wide) that work as light-directing tubes, much like fiberoptics
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| charge-coupled device (CCD) | show 🗑
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| collimation | show 🗑
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| show | area within the conductive layer where electrons are trapped
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| show | or cassette-based digital radiography is the digital acquisition modality that uses storage phosphor plates to produce projection images
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| show | layer of material that will absorb and reduce static electricity
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| show | alternative set of terms for total QM that includes maintenance of equipment, image acquisition, and processing standards
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| detective quantum efficiency (DQE) | show 🗑
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| detector size | show 🗑
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| show | global information technology standard that allows network communication between modality and PACS
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| show | any imaging acquisition process that produces an electronic image that can be viewed and manipulated on a computer
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| digital radiography (DR) | show 🗑
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| direct capture digital radiography | show 🗑
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| direct conversion | show 🗑
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| display workstation | show 🗑
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| show | PACS workflow where acquisition modalities send the images to a designated reading station and possibly review stations
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| dot pitch | show 🗑
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| show | printer that uses heat to develop the film
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| show | enhancement occurs when fewer pixels in the neighborhood are included in the signal average; the smaller the neighborhood, the greater the enhancement
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| exposure index (EI) | show 🗑
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| exposure indicator number | show 🗑
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| field effect transistor (FET) | show 🗑
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| show | device that scans hard copy x-ray images and converts them to digital images
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| fixed mode | show 🗑
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| flat panel detector | show 🗑
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| show | grid in which the scatter absorbing lead lines are tilted so that at a prescribed distance, the lines will converge
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| grid frequency | show 🗑
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| show | ratio of height of grid line to width of interspace material
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| high-pass filtering | show 🗑
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| histogram | show 🗑
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| image sampling | show 🗑
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| image stitching | show 🗑
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| show | thin piece of plastic with several layers of material that capture and store image data
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| indirect capture digital radiography | show 🗑
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| indirect conversion | show 🗑
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| laser | show 🗑
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| show | amount of error that can be made in exposure factor choice and still result in the capture of a quality image
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| show | term used by Agfa to express exposure to the imaging plate
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| show | reference histogram of luminance values derived during image acquisition
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| show | result of averaging each pixel's frequency with surrounding pixel values to remove high frequency noise; the result is a reduction of noise and contrast; useful for viewing small structures i.e. fine bone
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| matrix | show 🗑
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| modulation transfer function | show 🗑
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| show | grid line or image noise pattern that occurs when either the alignment of the grid to the laser scan direction is incorrect or when spatial frequency is greater than the Nyquist frequency; a wraparound image will result
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| Nyquist theorem | show 🗑
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| picture archival and communications system (PACS) | show 🗑
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| show | layer of photostimulable phosphor that "traps" electrons during exposure; usually made of phosphors from the barium fluorohalide family
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| show | device used to measure the luminescence of areas on the monitor
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| photomultiplier | show 🗑
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| show | light produced by a phosphor when stimulated by light or x-ray photons
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| show | basic picture element on a display
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| show | very thin, tough, clear plastic covering in the imaging plate for protection of the phosphor layer
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| show | subdivision of QM that focuses on equipment functions
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| quantum mottle | show 🗑
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| quantum noise | show 🗑
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| raster | show 🗑
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| reflective layer | show 🗑
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| refresh rate | show 🗑
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| show | number of pixels contained on a display
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| S, sensitivity number | show 🗑
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| semiautomatic mode | show 🗑
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| shuttering | show 🗑
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| show | AKA low-pass filtering; result of averaging each pixel's frequency with surrounding pixel values to remove high frequency noise
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| show | amount of detail or sharpness in a digital image
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| speed (in conventional radiography) | show 🗑
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| show | reflection of the amount of photostimulable luminescence given off by the imaging plate while being scanned by the laser
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| show | semirigid material in the imaging plate that gives the imaging sheet some strength
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| show | photosensitive array, made up of small (about 100 to 200 μm) pixels, converts light into electrical charges
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| wet imager | show 🗑
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| show | image manipulation parameter that changes screen image brightness usually through the use of a mouse
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