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37 Cards in this Set

  • Front
  • Back

Over use of post-processing will result in:

loosing original image information

when an image is sorted by its location

spatial domain

When each individual pixel is processed one at at time

point processing

When a group of pixels are processed

area processing

when all pixels are sorted at the same time

global processing

The image histogram is an example of ________ sorting

intensity

When image data is sorted according to brightness values, this is sorting in the:

intensity domain

sorting the data based on the various sizes of theobjects contained in the image

frequency domain

high frequency objects are ______ in size

small

low frequency objects are ______ in size

big

spatial frequency is expressed in:

cycles/mm

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

Inverse FourierTransformation

re‐composes theimage by adding all the wave components back together.

It's use is to suppress image noise

smoothing

Over using this will result in contrast that is too low (details are lost)

smoothing

In the frequencydomain, this post processing method suppresses high frequency structures

smoothing

results in a higher contrast image

edge enhancement

this can increase noise in the image

edge enhancement

if the frequency domain is used, high frequencystructures are amplified, and large frequency structures are suppressed.

edge enhancement

unsharp masking creates:

an edge enhanced image (image with increased contrast)

can result in the halo artifact if over used

edge enhancement

will make the entire image larger

Pan/Zoom

is used to cover up veiling glare

Backgroundremoval/shuttering/Electronic masking/electronic collimation

This process blackens out the whitecollimation boarders so it does not hurt the viewer’s eyes.

Backgroundremoval/shuttering/Electronic masking/electronic collimation

Refers to how the anatomy ispositioned on the computer screen

image orientation

Multiple projections are completeand they are “stitched” together to form one image for viewing

image stitching

Allows the user to add text to theimage.

image annotation

This should not be used routinely inplace of R & L anatomy markers

image annotation

used at thedisplay monitor to set the mid-level brightnessrange

window level

increasing widow level will make the image:

darker

decreasing widow level will make the image

brighter

used at the display monitor to adjust the grayscale

window width

increasing window width

increase the gray scale, decrease contrast

decreasing window width

decrease gray scale, increasecontrast

removessuperimposed structures so the anatomic area of interest can be bettervisualized

subtraction

inversion

reverses the grayscale of the radiograph




makes white black and black white

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.