ASRT Module 4, Image Processing &
Reconstruction
A set of rules or directions for getting a specific output from a specific input is called a: -
answer Algorithm
A mathematical method of estimating the value of an unknown function using the known
value on either side of the function - answer Interpolation
What are the three principal types of memory for computers? – answer ROM (read-only
memory)
RAM (random-access memory)
WROM (write-once read many times memory)
The process of using raw data to create an image is called: - answer reconstruction
Using the same raw data from an earlier scan to create a new image is called:
a. prospective reconstruction
b. retrospective reconstruction
c. interpolation
d. convolution - answerb. retrospective reconstruction
What type of reconstruction is automatically produced during scanning?
a. prospective reconstruction
b. retrospective reconstruction
c. interpolation
d. convolution - answera. prospective reconstruction
The DAS reading each arriving x-ray and measuring how much of the beam is
attenuated is called the: - answerRay sum
The process of converting the data from the attenuation profile to a matrix is known as: -
answerBack-projection
Measurements collected from the detector array is called ___________ data -
answerraw
What is the objective of image reconstruction? - answerComputer and assign a CT
number to each pixel
What is function of mathematical filters? - answerTo minimize streaks on the image that
result from back projection
Reconstruction
A set of rules or directions for getting a specific output from a specific input is called a: -
answer Algorithm
A mathematical method of estimating the value of an unknown function using the known
value on either side of the function - answer Interpolation
What are the three principal types of memory for computers? – answer ROM (read-only
memory)
RAM (random-access memory)
WROM (write-once read many times memory)
The process of using raw data to create an image is called: - answer reconstruction
Using the same raw data from an earlier scan to create a new image is called:
a. prospective reconstruction
b. retrospective reconstruction
c. interpolation
d. convolution - answerb. retrospective reconstruction
What type of reconstruction is automatically produced during scanning?
a. prospective reconstruction
b. retrospective reconstruction
c. interpolation
d. convolution - answera. prospective reconstruction
The DAS reading each arriving x-ray and measuring how much of the beam is
attenuated is called the: - answerRay sum
The process of converting the data from the attenuation profile to a matrix is known as: -
answerBack-projection
Measurements collected from the detector array is called ___________ data -
answerraw
What is the objective of image reconstruction? - answerComputer and assign a CT
number to each pixel
What is function of mathematical filters? - answerTo minimize streaks on the image that
result from back projection
