Question 1

In which of the following are slices taken at specific locations on the patient?

Accepted Answer

A)  Spiral CT 
B)  Helical CT 
C)  Conventional slice-by-slice CT 
D)  Volumetric CT 
A)  Spiral CT 
B)  Helical CT 
C)  Conventional slice-by-slice CT 
D)  Volumetric CT

Question 2

Please match the following concepts for each group. All answer selections will be used just once.

-Center of the Hounsfield unit range

Accepted Answer

A) Radiography 
B) Heterogeneous beam 
C) WW 
D) Conventional tomography 
E) Homogeneous beam
F)Display device
G)Attenuation
H)Data acquisition
I)CT
J)WL 
A) Radiography 
B) Heterogeneous beam 
C) WW 
D) Conventional tomography 
E) Homogeneous beam
F)Display device
G)Attenuation
H)Data acquisition
I)CT
J)WL

Question 3

The radiation beam produced from a conventional X-ray tube is:

Accepted Answer

A)  homogeneous. 
B)  heterogeneous. 
C)  monoenergetic. 
D)  monochromatic. 
A)  homogeneous. 
B)  heterogeneous. 
C)  monoenergetic. 
D)  monochromatic.

Question 4

Which of the following is a limitation of radiography?

Accepted Answer

A)  Image blur caused by patient breathing 
B)  Contrast degradation because of low peak kilovoltage techniques 
C)  The presence of ghost images caused by the tube movement 
D)  Superimposition of structures 
A)  Image blur caused by patient breathing 
B)  Contrast degradation because of low peak kilovoltage techniques 
C)  The presence of ghost images caused by the tube movement 
D)  Superimposition of structures

Question 5

A polychromatic beam is better known as a homogeneous beam.

Accepted Answer

A) True 
 B)False

Question 6

The field of view (FOV) is:

Accepted Answer

A)  the reconstruction circle. 
B)  the ROI. 
C)  a mathematical technique. 
D)  a digital processing technique. 
A)  the reconstruction circle. 
B)  the ROI. 
C)  a mathematical technique. 
D)  a digital processing technique.

Question 7

A high-kilovolt (kV) technique is necessary in CT imaging for all of the following reasons except:

Accepted Answer

A)  to reduce the contrast of bone relative to soft tissues. 
B)  to increase the probability of beam hardening. 
C)  to reduce the dependence of attenuation coefficients on photon energy. 
D)  to produce a high-radiation flux at the detector. 
A)  to reduce the contrast of bone relative to soft tissues. 
B)  to increase the probability of beam hardening. 
C)  to reduce the dependence of attenuation coefficients on photon energy. 
D)  to produce a high-radiation flux at the detector.

Question 8

Which of the following is used to calculate CT numbers?

Accepted Answer

A)  CT number = $\mu$ water + $\mu$ tissue $\mu$ K 
B)  CT number = $\mu$ tissue - $\mu$ water *K/$\mu$ tissue 
C)  CT number = $\mu$ water - $\mu$ tissue * K/$\mu$ water 
D)  CT number = $\mu$ tissue- $\mu$ water * K/$\mu$ water 
A)  CT number = $\mu$ water + $\mu$ tissue $\mu$ K 
B)  CT number = $\mu$ tissue - $\mu$ water *K/$\mu$ tissue 
C)  CT number = $\mu$ water - $\mu$ tissue * K/$\mu$ water 
D)  CT number = $\mu$ tissue- $\mu$ water * K/$\mu$ water

Question 9

CT numbers are established by referencing the linear attenuation coefficient of air.

Accepted Answer

A) True 
 B)False

Question 10

If the linear attenuation coefficients for bone and water are 0.380 and 0.190, respectively, and the scaling factor of the scanner is 1000, the CT number for bone is:

Accepted Answer

A)  +1000. 
B)  (-1000). 
C)  +380. 
D)  +190. 
A)  +1000. 
B)  (-1000). 
C)  +380. 
D)  +190.

Question 11

The reduction of the intensity of a beam of X-rays as it passes through the patient is:

Accepted Answer

A)  the relative transmission value. 
B)  attenuation. 
C)  the natural logarithm. 
D)  the linear attenuation coefficient. 
A)  the relative transmission value. 
B)  attenuation. 
C)  the natural logarithm. 
D)  the linear attenuation coefficient.

Question 12

Attenuation of a beam of radiation depends on each of the following except:

Accepted Answer

A)  the electrons per gram of tissue. 
B)  the energy of the radiation. 
C)  the speed of the radiation. 
D)  the atomic number of the tissue. 
A)  the electrons per gram of tissue. 
B)  the energy of the radiation. 
C)  the speed of the radiation. 
D)  the atomic number of the tissue.

Question 13

Data processing includes all of the following except:

Accepted Answer

A)  raw data preprocessing. 
B)  analog to digital conversion. 
C)  image reconstruction. 
D)  image storage. 
A)  raw data preprocessing. 
B)  analog to digital conversion. 
C)  image reconstruction. 
D)  image storage.

Question 14

Which of the following is not true of a homogeneous beam of radiation?

Accepted Answer

A)  All the photons have different energies 
B)  All the photons have the same energy 
C)  Equal thicknesses of the absorber remove equal amounts of radiation 
D)  Equal thicknesses of the absorber remove different amounts of radiation 
A)  All the photons have different energies 
B)  All the photons have the same energy 
C)  Equal thicknesses of the absorber remove equal amounts of radiation 
D)  Equal thicknesses of the absorber remove different amounts of radiation

Question 15

The center or midpoint of the range of CT numbers is called the:

Accepted Answer

A)  WW. 
B)  WL. 
C)  ROI. 
D)  contrast factor. 
A)  WW. 
B)  WL. 
C)  ROI. 
D)  contrast factor.

In which of the following are slices taken at specific locations on the patient?

Please match the following concepts for each group. All answer selections will be used just once. -Center of the Hounsfield unit range

The radiation beam produced from a conventional X-ray tube is:

Which of the following is a limitation of radiography?

A polychromatic beam is better known as a homogeneous beam.

The field of view (FOV) is:

A high-kilovolt (kV) technique is necessary in CT imaging for all of the following reasons except:

Which of the following is used to calculate CT numbers?

CT numbers are established by referencing the linear attenuation coefficient of air.

If the linear attenuation coefficients for bone and water are 0.380 and 0.190, respectively, and the scaling factor of the scanner is 1000, the CT number for bone is:

The reduction of the intensity of a beam of X-rays as it passes through the patient is:

Attenuation of a beam of radiation depends on each of the following except:

Data processing includes all of the following except:

Which of the following is not true of a homogeneous beam of radiation?

The center or midpoint of the range of CT numbers is called the:

Computed Tomography: an Overview

Digital Image Processing

Data Acquisition Concepts

Image Reconstruction

Iterative Reconstruction Basics

Basic Instrumentation

Image Postprocessing and Visualization Tools

Image Quality

Radiation Dose in Computed Tomography

Multislice Computed Tomography: Physical Principles and Instrumentation

Other Technical Applications of Computed Tomography Imaging: Basic Principles

Three-Dimensional Computed Tomography: Basic Concepts

Positron Emission Tomographyct Petct and Single-Photon Emission Computed Tomographyct Spectct Hybrid Scanners

Computed Tomography of the Head, Cerebral Vessels, Neck, and Spine

Computed Tomography of the Body

Pediatric Computed Tomography

Quality Control for Computed Tomography Scanners

Filters

Exam 3: Physical Principles of Computed Tomography

In which of the following are slices taken at specific locations on the patient?

Please match the following concepts for each group. All answer selections will be used just once. -Center of the Hounsfield unit range

The radiation beam produced from a conventional X-ray tube is:

Which of the following is a limitation of radiography?

A polychromatic beam is better known as a homogeneous beam.

The field of view (FOV) is:

A high-kilovolt (kV) technique is necessary in CT imaging for all of the following reasons except:

Which of the following is used to calculate CT numbers?

CT numbers are established by referencing the linear attenuation coefficient of air.

If the linear attenuation coefficients for bone and water are 0.380 and 0.190, respectively, and the scaling factor of the scanner is 1000, the CT number for bone is:

The reduction of the intensity of a beam of X-rays as it passes through the patient is:

Attenuation of a beam of radiation depends on each of the following except:

Data processing includes all of the following except:

Which of the following is not true of a homogeneous beam of radiation?

The center or midpoint of the range of CT numbers is called the:

Computed Tomography: an Overview

Digital Image Processing

Data Acquisition Concepts

Image Reconstruction

Iterative Reconstruction Basics

Basic Instrumentation

Image Postprocessing and Visualization Tools

Image Quality

Radiation Dose in Computed Tomography

Multislice Computed Tomography: Physical Principles and Instrumentation

Other Technical Applications of Computed Tomography Imaging: Basic Principles

Three-Dimensional Computed Tomography: Basic Concepts

Positron Emission Tomographyct Petct and Single-Photon Emission Computed Tomographyct Spectct Hybrid Scanners

Computed Tomography of the Head, Cerebral Vessels, Neck, and Spine

Computed Tomography of the Body

Pediatric Computed Tomography

Quality Control for Computed Tomography Scanners

Filters