post processing

what are the 3 main processing domains

spatial

intensity

frequency

what is the sorting of domain by location of pixels

spatial domain

what are the 3 classifications of spatial domain

point processing

area processing

global operations

what does point processing do

performs algorithm to each individual pixel during spatial domain

what is an example of point processing

subtraction

what is area processing and example

subsection of image

zooming

what is global operation and example

doing to entire image

flip, kernal

what is intensity domain and example

sorting of image by values of pixels

histogram analysis, windowing

what is frequency domain

sorting of image according to sizes of objects/ details

which of the 3 domains is not based on pixels

frequency

what is an example of frequency domain

edge enhancement, smoothing

Gradation processing primarily controls the image what

Gray scale and brightness

During gradation processing the rescaled data is fed into the

Anatomical LUT

The primary purpose of a look up table is to

Customize image brightness and gray scale for specific anatomy

What is material mottle

Underpenetrated thick part

What is quantum mottle

Not enough x rays

What can save computer space by not using entire bit depth resulting in better tissue visualization

Dynamic range compression (equalization)

Values @ or >0 result in what

Noise reduction and smooth

Values that are negative & postive and have a sum of 1 result in

Edge enhancement

What causes halo effect

Overuse of edge enhancement

What is Fourier transformation

Math process that allows complex wave form to be broken into individual sine waves

What is inverse Fourier transformation

Add all separated waves back together

High pass filtering filters what and results in what

Out low frequencies and results in edge enhancement

What is periodic noise

Regular pattern (snow)

What is random noise

Small artifacts in chaotic pattern