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CTL1 Flashcards

(30 cards)

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1
Q
  1. Image reconstruction refers to the process of:

A. Producing radiation
B. Using raw data to create image data
C. Storing CT images
D. Printing radiographic images

A
  1. Image reconstruction refers to the process of:

A. Producing radiation
B. Using raw data to create image data
C. Storing CT images
D. Printing radiographic images

Answer: B

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2
Q
  1. CT image reconstruction may take approximately:

A. 5–10 minutes
B. 2–3 minutes
C. Up to 30 seconds or less than 1 second
D. 1 hour

A

Answer: C

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3
Q
  1. Which process converts tissue attenuation profile into a CT image?

A. Image enhancement
B. Reconstruction
C. Image storage
D. Image processing

A

Answer: B

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4
Q
  1. Which mathematical method converts spatial location data into spatial frequency data?

A. Back projection
B. Interpolation
C. Fourier transformation
D. Reformatting

A
  1. Which mathematical method converts spatial location data into spatial frequency data?

A. Back projection
B. Interpolation
C. Fourier transformation
D. Reformatting

Answer: C

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5
Q
  1. Fourier transformation was developed by:

A. Wilhelm Roentgen
B. Jean-Baptiste-Joseph Fourier
C. Marie Curie
D. Godfrey Hounsfield

A
  1. Fourier transformation was developed by:

A. Wilhelm Roentgen
B. Jean-Baptiste-Joseph Fourier
C. Marie Curie
D. Godfrey Hounsfield

Answer: B

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6
Q
  1. Which reconstruction is automatically produced during scanning?

A. Retrospective reconstruction
B. Prospective reconstruction
C. Iterative reconstruction
D. Linear reconstruction

A
  1. Which reconstruction is automatically produced during scanning?

A. Retrospective reconstruction
B. Prospective reconstruction
C. Iterative reconstruction
D. Linear reconstruction

Answer: B

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7
Q
  1. Which reconstruction uses the same raw data to generate new images later?

A. Prospective reconstruction
B. Retrospective reconstruction
C. Filtered reconstruction
D. Iterative reconstruction

A
  1. Which reconstruction uses the same raw data to generate new images later?

A. Prospective reconstruction
B. Retrospective reconstruction
C. Filtered reconstruction
D. Iterative reconstruction

Answer: B

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8
Q
  1. Which reconstruction method converts attenuation profile data into a matrix?

A. Reformatting
B. Interpolation
C. Back projection
D. Iterative reconstruction

A
  1. Which reconstruction method converts attenuation profile data into a matrix?

A. Reformatting
B. Interpolation
C. Back projection
D. Iterative reconstruction

Answer: C

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9
Q
  1. What is a major disadvantage of back projection?

A. High radiation dose
B. Blurred images
C. Long scanning time
D. Low contrast

A
  1. What is a major disadvantage of back projection?

A. High radiation dose
B. Blurred images
C. Long scanning time
D. Low contrast

Answer: B

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10
Q
  1. Which artifact is commonly produced by back projection?

A. Motion artifact
B. Ring artifact
C. Star artifact
D. Metal artifact

A
  1. Which artifact is commonly produced by back projection?

A. Motion artifact
B. Ring artifact
C. Star artifact
D. Metal artifact

Answer: C

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11
Q
  1. Which method applies a filter before back projection occurs?

A. Iterative reconstruction
B. Filtered back projection
C. Reformatting
D. Interpolation

A
  1. Which method applies a filter before back projection occurs?

A. Iterative reconstruction
B. Filtered back projection
C. Reformatting
D. Interpolation

Answer: B

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12
Q
  1. Filtered back projection is mainly used to:

A. Increase radiation dose
B. Reduce noise and star artifact
C. Increase scan time
D. Store CT data

A
  1. Filtered back projection is mainly used to:

A. Increase radiation dose
B. Reduce noise and star artifact
C. Increase scan time
D. Store CT data

Answer: B

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13
Q
  1. Another term for convolution filter is:

A. Algorithm
B. Kernel
C. Detector
D. Pixel

A
  1. Another term for convolution filter is:

A. Algorithm
B. Kernel
C. Detector
D. Pixel

Answer: B

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14
Q
  1. Convolution filters are applied to:

A. Processed images
B. Final CT images
C. Raw data before back projection
D. Stored images

A
  1. Convolution filters are applied to:

A. Processed images
B. Final CT images
C. Raw data before back projection
D. Stored images

Answer: C

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15
Q
  1. Which is an advantage of convolution filters?

A. Increase radiation exposure
B. Minimize streak artifacts
C. Decrease contrast
D. Blur the image

A
  1. Which is an advantage of convolution filters?

A. Increase radiation exposure
B. Minimize streak artifacts
C. Decrease contrast
D. Blur the image

Answer: B

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16
Q
  1. Deconvolution refers to:

A. Increasing pixel brightness
B. Removing image noise
C. Returning pixel values to original level
D. Reducing contrast

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A
  1. Deconvolution refers to:

A. Increasing pixel brightness
B. Removing image noise
C. Returning pixel values to original level
D. Reducing contrast

Answer: C

17
Q
  1. Which filter is commonly used for soft tissue imaging?

A. Ramp filter
B. High pass filter
C. Hann filter
D. Bone filter

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A
  1. Which filter is commonly used for soft tissue imaging?

A. Ramp filter
B. High pass filter
C. Hann filter
D. Bone filter

Answer: C

18
Q
  1. Low pass filters generally produce:

A. High spatial resolution
B. Smooth images with less detail
C. Very sharp images
D. Grainy images

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A
  1. Low pass filters generally produce:

A. High spatial resolution
B. Smooth images with less detail
C. Very sharp images
D. Grainy images

Answer: B

19
Q
  1. Which filter increases the difference between adjacent pixels?

A. Low pass filter
B. High pass filter
C. Soft tissue filter
D. Hann filter

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A
  1. Which filter increases the difference between adjacent pixels?

A. Low pass filter
B. High pass filter
C. Soft tissue filter
D. Hann filter

Answer: B

20
Q
  1. High pass filters are commonly used for imaging:

A. Soft tissues
B. Blood vessels
C. Bones
D. Organs

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A
  1. High pass filters are commonly used for imaging:

A. Soft tissues
B. Blood vessels
C. Bones
D. Organs

Answer: C

21
Q
  1. Interpolation refers to:

A. Removing image noise
B. Creating missing data mathematically
C. Storing raw data
D. Displaying CT images

Study These Flashcards
A
  1. Interpolation refers to:

A. Removing image noise
B. Creating missing data mathematically
C. Storing raw data
D. Displaying CT images

Answer: B

22
Q
  1. Which interpolation assumes that an unknown point lies on a straight line between two known points?

A. Polynomial interpolation
B. Linear interpolation
C. Cubic interpolation
D. Fourier interpolation

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A
  1. Which interpolation assumes that an unknown point lies on a straight line between two known points?

A. Polynomial interpolation
B. Linear interpolation
C. Cubic interpolation
D. Fourier interpolation

Answer: B

23
Q
  1. The first interpolation algorithm used in CT was:

A. 180° interpolation
B. 360° interpolation
C. 270° interpolation
D. 90° interpolation

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A
  1. The first interpolation algorithm used in CT was:

A. 180° interpolation
B. 360° interpolation
C. 270° interpolation
D. 90° interpolation

Answer: B

24
Q
  1. Which interpolation improved Z-axis resolution?

A. 360° interpolation
B. 270° interpolation
C. 180° interpolation
D. 90° interpolation

Study These Flashcards
A
  1. Which interpolation improved Z-axis resolution?

A. 360° interpolation
B. 270° interpolation
C. 180° interpolation
D. 90° interpolation

Answer: C

25
25. Reformatting allows the creation of: A. Images from different scanning planes B. New scan exposures C. Higher radiation doses D. Film copies
25. Reformatting allows the creation of: A. Images from different scanning planes B. New scan exposures C. Higher radiation doses D. Film copies Answer: A
26
26. Reformatting requires access to: A. Processed images B. Raw data C. Film images D. Printed images
26. Reformatting requires access to: A. Processed images B. Raw data C. Film images D. Printed images Answer: B
27
27. Which reconstruction method uses repeated algorithms to improve image clarity? A. Back projection B. Reformatting C. Iterative reconstruction D. Interpolation
27. Which reconstruction method uses repeated algorithms to improve image clarity? A. Back projection B. Reformatting C. Iterative reconstruction D. Interpolation Answer: C
28
28. A major advantage of iterative reconstruction is: A. Increased image noise B. Reduced radiation dose C. Longer scanning time D. Lower contrast
28. A major advantage of iterative reconstruction is: A. Increased image noise B. Reduced radiation dose C. Longer scanning time D. Lower contrast Answer: B
29
29. Which 3D reconstruction technique selects the highest value pixels along a line? A. SSD B. SVD C. MIP D. Iterative reconstruction
30
30. Which 3D technique produces a highly realistic volume-rendered image? A. MIP B. SSD C. SVD D. Interpolation
30. Which 3D technique produces a highly realistic volume-rendered image? A. MIP B. SSD C. SVD D. Interpolation Answer: C
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