reconstruction algorithms

Algorithms are

•“a precise set of steps to be performed in a specific order to solve a problem.”¹

RECONSTRUCTION ALGORITHMS

•Are built into scan protocols or may be chosen by operator

Post-processing filters are also known as

algorithm, convolution filter or kernel

post processign filters are applied to

raw data only to create an image

kernel is also known as

filter

what does the kernel depend on

what parts of raw data that is being altered i.e spatial resolution or contrast resolution

kernels can…

enhance or supress data

what is built in scan protocols but also something you can choose?

scan protocols

smoothing filter is also known as

low pass filter

what does the smoothing filter do

reduce the appearance of artifacts

what is a con about the smoothing filter

reduces spatial resolution

define spatial resolution

ability to differentiate between two objects

what is this

smoothing filter

what is the opposite of smooth filter

edge enhancement

what is edge enhancement

a high pass filter that emphasizes the difference between adjacent pixels. it suppresses low spatial frequencies

what is the main thing about edge enhancement

improves spatial resolution

what is the con about edge enhancement

sacrifices low contrast resolution

what does edge enhancement NOT do

replace original image

edge enhancement

when are bone filters used

optimal low contrast resolution is NOT required

what does a bone filter increase

spatial resolution

what is the con about bone filters

increase noise in the image

when do we use a bone filter

inner ear

bone filter

bone filter

what are bone filter referred to as

bone windows

bone windows

lung window

what type of artifact is reduced by smoothing filters

metallic artifacts