loss of digital information because of a fluctuating signal
aliasing
software function that allows historical information to be gathered from digital storage
archive query
conversion of the digital image using contrast enhancement parameters
contrast manipulation
occurs when exposure is greater or less than the optimal amount to produce a diagnostic image
automatic rescaling
the frequency of a signal that exactly matches the Nyquist frequency, resulting in zero-amplitude signal caused by phase shifts
critical frequency
enhancement occurs when fewer pixels in the neighborhood are included in the signal average; the smaller the neighborhood the greater the enhancement
edge enhancement
technique for the enhancement of contrast and edge that amplifies the frequencies of areas of interest that are known
highpass filtering
graphic representation of all the digitally recorded signals of a digital x-ray exposure
histogram
software function that allows text or markers to be digitally added to an image
image annotation
identification of the top or side of an image
image orientation
amount of information gathered from pixel storage
image sampling
process of sewing together multiple images to form one continuous image
imaging stitching
reference histogram of the luminescence values derived during image acquisition
lookup table
result of averaging each pixel's frequency with surrounding pixel values to remove high frequency noise
low pass filtering
computer function that allows images to be sent to specified reading stations
manual send
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
nyquist theorem
input information regarding patient age, identifying number, ordering physician
patient demographics
used to blacken out the white collimation borders in a digital image, effectively eliminating veil glare
shuttering
low-pass filtering, the result of averaging each pixel's frequency with surrounding pixel values to remove high frequency noise
smoothing
amount of detail or sharpness in a digital images
spatial frequency resolution
image manipulation parameter that changes screen image brightness, usually through the use of a mouse
window level
image manipulation parameters that changes screen image contrast
window width