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37 Cards in this Set
- Front
- Back
Over use of post-processing will result in: |
loosing original image information |
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when an image is sorted by its location |
spatial domain |
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When each individual pixel is processed one at at time |
point processing |
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When a group of pixels are processed |
area processing |
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when all pixels are sorted at the same time |
global processing |
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The image histogram is an example of ________ sorting |
intensity |
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When image data is sorted according to brightness values, this is sorting in the: |
intensity domain |
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sorting the data based on the various sizes of theobjects contained in the image |
frequency domain |
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high frequency objects are ______ in size |
small |
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low frequency objects are ______ in size |
big |
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spatial frequency is expressed in: |
cycles/mm |
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The Fourier transformation: |
breaks the image down by size, according to its frequency (wave components). converts the image from the spatial domain tothe frequency domain |
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Inverse FourierTransformation |
re‐composes theimage by adding all the wave components back together. |
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It's use is to suppress image noise |
smoothing |
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Over using this will result in contrast that is too low (details are lost) |
smoothing |
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In the frequencydomain, this post processing method suppresses high frequency structures |
smoothing |
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results in a higher contrast image |
edge enhancement |
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this can increase noise in the image |
edge enhancement |
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if the frequency domain is used, high frequencystructures are amplified, and large frequency structures are suppressed. |
edge enhancement |
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unsharp masking creates: |
an edge enhanced image (image with increased contrast) |
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can result in the halo artifact if over used |
edge enhancement |
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will make the entire image larger |
Pan/Zoom |
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is used to cover up veiling glare |
Backgroundremoval/shuttering/Electronic masking/electronic collimation |
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This process blackens out the whitecollimation boarders so it does not hurt the viewer’s eyes. |
Backgroundremoval/shuttering/Electronic masking/electronic collimation |
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Refers to how the anatomy ispositioned on the computer screen |
image orientation |
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Multiple projections are completeand they are “stitched” together to form one image for viewing |
image stitching |
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Allows the user to add text to theimage. |
image annotation |
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This should not be used routinely inplace of R & L anatomy markers |
image annotation |
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used at thedisplay monitor to set the mid-level brightnessrange |
window level |
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increasing widow level will make the image: |
darker |
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decreasing widow level will make the image |
brighter |
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used at the display monitor to adjust the grayscale |
window width |
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increasing window width |
increase the gray scale, decrease contrast |
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decreasing window width |
decrease gray scale, increasecontrast |
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removessuperimposed structures so the anatomic area of interest can be bettervisualized |
subtraction |
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inversion |
reverses the grayscale of the radiograph makes white black and black white |
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Multiscale processing |
Thisis a more advanced form of frequency processing, whereby the image isdecomposed into multiple spatial frequency bands, based on size. Filters arethen applied to each sub-image. |