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23 Cards in this Set
- Front
- Back
Archive Query
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software function that allows historical information to be gathered from digital storage, such as multiple examinations, a range of dates, or by pathology
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Automatic Rescaling
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occurs when exposure is greater or less than the optimal amount to produce a diagnositic image; it is the effort of the computer to "fix" exposure errors
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Contrast Manipulation
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conversion of the digital image using contrast enhancement parameters
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Edge enhancement
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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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High-Pass filtering
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technique for the enhancement of contrast and edge that amplifies the frequencies of areas of interest that are known (those frequencies that can be ammmmplified) and suppresses frequencies outside the area of interest)
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Histogram
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graphic representation of all the digitally recorded signals of a digital x-ray exposure
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Image Annotation
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software function that allows text or markers to be digitally added to an image
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Low-pass filtering
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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 such as fine bone
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Magnification
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enlargement of an image in all dimensions without loss of sharpness
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Manual send
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computer function that allows images to be sent to specified reading stations
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Modulation Transfer Reduction
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Ability of a system to record available spatial frequencies
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Nyquist Theorem
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When sampling a signal such as the conversion from an analog to a digital image, the sampling frequency must be greater than twice the bandwidth of the input signal so that the reconstruction of the original image will be nearly perfect.
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Patient Demographics
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input information regarding patient age, identifying number, ordering physician and so on.
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Shuttering
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used to blacken out the white collimation borders ina digital image, effectively eliminating veil glare.
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Smoothing
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also know as low-pass filtering, the result of averaging each pixels frequency with surrounding pixel values to remove high frequency noise.
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Spatial Frequency Resolution
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amount of detail or sharpness in a digital image
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Window
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image manipulation parameter that changes screen image brightness, usually through the use of a mouse
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Image Orientation
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identification of the top or side of an image
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Image Sampling
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amount of information gathered from pixel storage
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Image stitching
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process of 'sewing" together multiple images to form a continuous image.
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Latitude
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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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Level
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image maniipulation parameter that changes screen image contrast usually through the use of a mouse.
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Look-Up Table (LUT)
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reference histogram of the luminance values derived during image acquisition.
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