Ch12 Terms
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| ANALOG | Any information represented in continuous fashion rather than discrete units
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| ANALOG-TO-DIGITAL CONVERSION | Process of converting a continuous (analog)signal to discrete (digital) units
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| BARIUM FLUOROHALLIDE (BaFX:Eu 2+) | Barium florohalide with europium, the photostimulable phosphor used on CR image plates
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| CATHODE RAY TUBE (CRT) | Electron tube (like a tv tube) that makes the computer output visible; sometimes called a video display unit (VDU)
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| COMPUTED RADIOGRAPHY (CR) | Digital imaging process using a photostimulable chemical plate for initial acquisition of image data; the display parameters of the image can be manipulated by a computer at a later time
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| DEFAULT | Parameters by which the system operates; if no changes in instructions are made by the operator, the preset operating parameters or controls of the system prevail
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| DIGITAL | Any information represented in discrete units
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| DUAL ENERGY IMAGING | X-ray imaging technique in which two x-ray exposures are taken of the the same body part using two different kilovoltages; the two images are processed to remove image contrast resulting from either soft tissue or bone
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| DVD | Digital video disk; type of read only memory compact disc
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| DYNAMIC RANGE | Orders of magnitude over which the system can accurately portray information
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| DYNAMIC RANGE CONTROL | Image processing algorithm for image enhancement that provides a wide diagnostic field, allowing visualization of bone and soft tissue in a single display
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| EDGE ENHANCEMENT | Technique of setting the spatial frequency response so that structures of a given type, usually bones, stand out in bold relief
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| ENERGY SUBTRACTION | Processing technique used in computed radiography that include a dual-exposure method, which requires irradiation with two different x-ray energies, and a single-exposure method, which requires only on x-ray irradiation but in which the x-ray energies...
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| GRADATION PROCESSING | Technique of setting the range of values over which an image is displayed; allows selection of a wide range of values to display structures with widely differing densities
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| GRAY LEVEL DISPLAY | # of possible shades of gray in a digital image; # depends on pixel depth and the display units
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| HELIUM-NEON (633 NM) LASER | Intense, coherent beam of light in the red wavelength
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| HISTOGRAM | Graphic representation of the frequency distribution of gray levels
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| IMAGE PLATE READER | component of the CT system that scans the image plate with a laser and converts the analog info into an electrical signal, then to digital
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| IMAGING PLATE | Image capture portion of CT; captures an x-ray image as electrons are stored in stable traps withing the phosphor compound
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| LATENT IMAGE | nonobservable representation of a structure such as the vaired energy changes inherent in the cyrstalline structure of imaging plates
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| MATRIX | Gridlike pattern of an image composed of a certain number of pixels both in the horizontal and vertical planes
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| MEGABYTE (MB) | 1000 bytes
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| MOIRE | Fine network of wavy lines that have a watered appearance on the displayed image
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| PHOTOSTIMULABLE PHOSPHOR | Special luminescent material that stores x-ray energy and emits light proportional to the stored x-ray energy when stimulated by energy such as visible light from a laser
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| PICTURE ARCHIVE AND COMMUNICATION SYSTEM (PACS) | System of computers linked together via a network to store and transmit digital images throughout the network
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| PIXELS (PICTURE ELEMENTS) | Small squares that form the image; pixels have depth in bits usually 8, 12, 15; the greater the depth, the larger the gray scale
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| SPATIAL FREQUENCY RESPONSE | Sharpness of image that controls how prominently the edges are seen
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| SPATIAL RESOLUTION | How small an object that can be detected by an imaging systems and how close together two similar objects can be and still be identified as separate objects
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| TELERADIOGRAHY | Ability to send and receive images over telephone lines from one institution to another
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| THROUGHPUT | Rate at which items can be processed throughout a system
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