# Quiz 5: Image Reconstruction

Nursing

Q 1Q 1

Which of the following refers to a function that relates to the amplitude and phases of a sine wave and corresponds to a specific frequency?
A) Fourier transform
B) Algorithm
C) Convolution
D) Interpolation

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Multiple Choice

A

Q 2Q 2

Which is a mathematical technique used to estimate the value of a function from known values on either side of the function?
A) Convolution
B) Interpolation
C) Back-projection
D) Projection ratio

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Multiple Choice

B

Q 3Q 3

Which of the following is a digital image processing technique used to modify images through a filter function?
A) Convolution
B) Interpolation
C) Back-projection
D) Projection filter

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Multiple Choice

A

Q 4Q 4

A set of ray sums is referred to as a:
A) ray sum.
B) projection.
C) total ray projection.
D) view.

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Multiple Choice

Q 5Q 5

Hounsfield's first scanner used _________________ beam projections acquired through a 180-degree rotation.
A) perpendicular
B) parallel
C) long
D) short

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Multiple Choice

Q 6Q 6

All of the following describe basic problems with the back-projection algorithm except:
A) the produced image is blurred.
B) the image not useful for clinical CT.
C) compares assumptions with measured values.
D) the image suffers from a star pattern artifact.

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Multiple Choice

Q 7Q 7

Which algorithm belongs to the class of analytical algorithms for CT?
A) Back-projection
B) Filtered back-projection (FBP)
C) Iterative reconstruction (IR)
D) Fourier reconstruction

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Multiple Choice

Q 8Q 8

Which of the following reconstruction algorithms was used by Hounsfield in his original experiments?
A) Back-projection
B) Algebraic reconstruction technique
C) Fourier transform
D) FBP

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Multiple Choice

Q 9Q 9

Which of the following algorithms is most commonly used in the state-of-the-art CT scanners?
A) Iterative algorithms
B) Back-projection
C) FBP
D) Fourier reconstruction

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Multiple Choice

Q 10Q 10

The result of the preprocessing of the signals from the CT detectors is called:
A) convolved data.
B) raw data.
C) image data.
D) back-projected data

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Multiple Choice

Q 11Q 11

The first operation to which raw data is subjected is referred to as:
A) convolution.
B) back-projection.
C) three-dimensional surface shading.
D) interpolation.

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Multiple Choice

Q 12Q 12

Image data are obtained:
A) after convolution.
B) after preprocessing.
C) after back-projection.
D) before back-projection.

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Multiple Choice

Q 13Q 13

Which of the following describes the beam that diverges from the X-ray tube to the outer edges of the detectors?
A) Cone beam
B) Aperture beam
C) Straight beam
D) Fan beam

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Multiple Choice

Q 14Q 14

Which is a class of cone-beam algorithms available for use with the new generation of multislice CT (MSCT) scanners?
A) Filtered cone-beam algorithms
B) Convoluted cone-beam algorithms
C) Exact cone-beam algorithms
D) Three-dimensional cone-beam algorithms

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Multiple Choice

Q 15Q 15

Which of the following refers to a defined set of instructions for solving a problem?
A) Algorithm
B) Fourier transform
C) Interpolation
D) Convolution

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Multiple Choice

Q 16Q 16

Which of the following will allow the user to interactively visualize, manipulate, and measure large three-dimensional objects on general-purpose workstations?
A) Three-dimensional algorithms
B) Interpolation algorithms
C) Fourier transform
D) Three-dimensional convolution

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Multiple Choice

Q 17Q 17

The use of __________ coefficients makes it possible to reconstruct an image in CT.
A) Hounsfield
B) convolution
C) Fourier
D) Ambrose

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Multiple Choice

Q 18Q 18

Which of the following algorithms compares an assumption with the measured values, makes corrections, and then repeats the process?
A) Analytical reconstruction algorithms
B) Back-projection
C) IR algorithms
D) Fourier reconstruction algorithms

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Multiple Choice

Q 19Q 19

FBP is also referred to as the ______________ _______________.
A) convolution method
B) interpolation method
C) algorithm method
D) iterative method

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Multiple Choice

Q 20Q 20

Which of the following removes the classical star pattern artifact of the back-projection algorithm?
A) Interpolation
B) Fourier reconstruction
C) FBP
D) Iterative algorithm

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Multiple Choice

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True False

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True False

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True False

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True False

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True False

Q 26Q 26

The algorithms for the single-slice (SCCT) and MSCT scanners with four detector rows are referred to as spiral/helical fan-beam approximation algorithms.

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True False

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True False

Q 28Q 28

The Fourier transform is a technique for estimating a function from known values on both sides of it.

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True False

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True False

Q 30Q 30

The algorithms for three-dimensional imaging are based on those used in computer graphics and visual perception science.

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True False

Q 31Q 31

Please match the image reconstruction concepts. All answer selections will be used just once.
a.Set of directions for getting a specific output from a specific input
b.Mathematical technique of value estimation
c.Converts signals in the spatial domain to the frequency domain
d.Digital image processing technique to modify images through filter function
e.Generation of multiple attenuated measurements
-Interpolation

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Short Answer

Q 32Q 32

Please match the image reconstruction concepts. All answer selections will be used just once.
a.Set of directions for getting a specific output from a specific input
b.Mathematical technique of value estimation
c.Converts signals in the spatial domain to the frequency domain
d.Digital image processing technique to modify images through filter function
e.Generation of multiple attenuated measurements
-Convolution

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Short Answer

Q 33Q 33

Please match the image reconstruction concepts. All answer selections will be used just once.
a.Set of directions for getting a specific output from a specific input
b.Mathematical technique of value estimation
c.Converts signals in the spatial domain to the frequency domain
d.Digital image processing technique to modify images through filter function
e.Generation of multiple attenuated measurements
-Fourier transform

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Short Answer

Q 34Q 34

Please match the image reconstruction concepts. All answer selections will be used just once.
a.Set of directions for getting a specific output from a specific input
b.Mathematical technique of value estimation
c.Converts signals in the spatial domain to the frequency domain
d.Digital image processing technique to modify images through filter function
e.Generation of multiple attenuated measurements
-Algorithm

Free

Short Answer

Q 35Q 35

Please match the image reconstruction concepts. All answer selections will be used just once.
a.Set of directions for getting a specific output from a specific input
b.Mathematical technique of value estimation
c.Converts signals in the spatial domain to the frequency domain
d.Digital image processing technique to modify images through filter function
e.Generation of multiple attenuated measurements
-Projection

Free

Short Answer