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23 Cards in this Set

  • Front
  • Back
algorithms
1)essential to the way computers process _______
-information
key points about algorithms (3)
-all vagueness is eliminated
-rules are well defined
-terminate after a set of number of steps
4 types of data
-measurement data
-raw data
-convolution data
-image data
fourier transformer
1)converts complex signals in _____ domain into a continuous spectrum of its sine & cosine components in the _______ domain
-spatial
-frequency
the coefficients of the ____ & _____ components make it possible to reconstruct an image in CT
-sine
-cosine
inverse fourier transformer reverts signal from the ____ domain back to ____ domain
-frequency
-spatial
measurement data is data ____ from the detectors

raw data
1)all data that is obtained from the detectors after it is ______
2)this is the data that is preserved & also called ______
-direct
-preprocessed
-scan data
convolution data is various mathematical convolution filters are applied to raw data to remove _____
-blur
convolution data has 2 parts
-high & low pass convolution filters
high pass convolution filters improve ______ by suppressing high spatial resolution (represented by bone- soft tissue interfaces)

low pass convolution filters improve ________ by suppressing low spatial frequencies (represented by a soft tissue like the brain & liver tissue
-contrast resolution
-spatial resolution
image data is known as _________ ______
-reconstructed data
pixel
1)____ that represents a small volume in the pt

voxel
1)is a volume element that has a _______ associated w it
-2D
-linear attenuation coefficient
the problem in CT is to reconstruct each _____ linear attenuation coefficient from many rays
-voxel
back projection is the simplest method
-___ all profiles to obtain an image
-causes _____ star patten _____
-sums
-classical
-artifact
step1 to reconstruction of algorithms
-collect the ____ sums from ____ degree angle & place them in the corresponding pixel elements
-ray
-0
step 2 to reconstruction of algorithms
-collect the ray sums from the ____ degree angle & add them to the corresponding pixel elements from step 1
-45
step 3 to reconstruction of algorithms
-collect ray sums from the _____ degree angle & add them to the corresponding pixel elements from step 2
-90
step 4 for reconstruction algorithms
-collect the ray sums from the ______ degree angle & add them to the corresponding pixel elements from step 3
-135
step 5 for reconstruction algorithms
-subtract a constant value ____
-6
step 6 for reconstruction algorithms
-____ by the common divisor ____ & you have the _____ matrix
-reduce
-3
-original
the fourier reconstruction method is used in _____ but not in ____ cause it requires more complicated math
-MRI
-CT
____ reconstruction was 1st reconstruction tech used by hounsfield in his brain studies
-iterative
________ is the most widely applied reconstruction algorithm in CT
-filtered back projection