Question 1

CT examinations currently account for approximately ________ of the U.S.population's radiation exposure resulting from medical procedures.

Accepted Answer

A)  10% 
B)  25% 
C)  50% 
D)  75% 
A)  10% 
B)  25% 
C)  50% 
D)  75%

Question 2

Also known as high-contrast resolution,this quality determines the system's ability to distinguish between very different tissue types as they get closer together.

Accepted Answer

A)  noise 
B)  spatial resolution 
C)  contrast resolution 
D)  all of the above 
A)  noise 
B)  spatial resolution 
C)  contrast resolution 
D)  all of the above

Question 3

With multislice CT,additional rows of detectors are added along the:

Accepted Answer

A)  W-axis 
B)  X-axis 
C)  Y-axis 
D)  Z-axis 
A)  W-axis 
B)  X-axis 
C)  Y-axis 
D)  Z-axis

Question 4

The actual anatomy being imaged for the CT study is determined by the:

Accepted Answer

A)  protocol 
B)  SFOV 
C)  DFOV 
D)  pitch 
A)  protocol 
B)  SFOV 
C)  DFOV 
D)  pitch

Question 5

An image with a WW of 200 and a WL of 50 produces an image that displays pixels with CT numbers ranging from:

Accepted Answer

A)  -100 to 100 
B)  -50 to 100 
C)  -50 to 150 
D)  200 to 250 
A)  -100 to 100 
B)  -50 to 100 
C)  -50 to 150 
D)  200 to 250

Question 6

Computed tomography was introduced in the:

Accepted Answer

A)  1950s 
B)  1960s 
C)  1970s 
D)  1980s 
A)  1950s 
B)  1960s 
C)  1970s 
D)  1980s

Question 7

Another name for the CT table is the:

Accepted Answer

A)  gurney 
B)  couch 
C)  board 
D)  all of the above 
A)  gurney 
B)  couch 
C)  board 
D)  all of the above

Question 8

Electron-beam CT does not use an x-ray tube.

Accepted Answer

A) True 
 B)False

Question 9

The CT system's accuracy can be determined by seeing if:

Accepted Answer

A)  the CT number of water in a container is 0 
B)  the CT number of water in a container is -1000 
C)  the CT number of water in a container is 1000 
D)  none of the above 
A)  the CT number of water in a container is 0 
B)  the CT number of water in a container is -1000 
C)  the CT number of water in a container is 1000 
D)  none of the above

Question 10

The detector found between the patient and the detectors is the:

Accepted Answer

A)  prepatient collimator 
B)  predetector collimator 
C)  A and B 
D)  none of the above 
A)  prepatient collimator 
B)  predetector collimator 
C)  A and B 
D)  none of the above

Question 11

Logarithmic conversion produces the linear attenuation coefficient data.

Accepted Answer

A) True 
 B)False

Question 12

Based on the Hounsfield scale,the CT number of air is:

Accepted Answer

A)  -1000 
B)  0 
C)  1000 
D)  none of the above 
A)  -1000 
B)  0 
C)  1000 
D)  none of the above

Question 13

Each major development in beam and detector geometry is called a:

Accepted Answer

A)  generation 
B)  gantry 
C)  detector 
D)  none of the above 
A)  generation 
B)  gantry 
C)  detector 
D)  none of the above

Question 14

Most modern CT scanners are based on _______________________ technology.

Accepted Answer

A)  first generation 
B)  second generation 
C)  third generation 
D)  fourth generation 
A)  first generation 
B)  second generation 
C)  third generation 
D)  fourth generation

Question 15

Filtered back projection is used to analyze the _____ data for one slice to determine the ______________________.

Accepted Answer

A)  raw;µ of each slice 
B)  raw;µ of each voxel 
C)  image;µ of each slice 
D)  image;µ of each voxel 
A)  raw;µ of each slice 
B)  raw;µ of each voxel 
C)  image;µ of each slice 
D)  image;µ of each voxel

Question 16

As the WW changes,the CT image's:

Accepted Answer

A)  contrast changes 
B)  brightness changes 
C)  spatial resolution changes 
D)  none of the above 
A)  contrast changes 
B)  brightness changes 
C)  spatial resolution changes 
D)  none of the above

Question 17

Which of the following data needs to be known to perform an attenuation calculation?

Accepted Answer

A)  original x-ray beam intensity 
B)  type of CT scanner 
C)  transmitted x-ray intensity 
D)  A and C 
A)  original x-ray beam intensity 
B)  type of CT scanner 
C)  transmitted x-ray intensity 
D)  A and C

Question 18

The limiting factor for contrast resolution is:

Accepted Answer

A)  SID 
B)  selection of window level 
C)  noise 
D)  spatial resolution 
A)  SID 
B)  selection of window level 
C)  noise 
D)  spatial resolution

Question 19

The midpoint of the range of CT numbers to be displayed in the image is the:

Accepted Answer

A)  window level 
B)  window height 
C)  window width 
D)  window clearance 
A)  window level 
B)  window height 
C)  window width 
D)  window clearance

Question 20

The process that allows image data to be displayed in coronal or sagittal planes is:

Accepted Answer

A)  annotation 
B)  windowing 
C)  ROI 
D)  MPR 
A)  annotation 
B)  windowing 
C)  ROI 
D)  MPR

CT examinations currently account for approximately ________ of the U.S.population's radiation exposure resulting from medical procedures.

Also known as high-contrast resolution,this quality determines the system's ability to distinguish between very different tissue types as they get closer together.

With multislice CT,additional rows of detectors are added along the:

The actual anatomy being imaged for the CT study is determined by the:

An image with a WW of 200 and a WL of 50 produces an image that displays pixels with CT numbers ranging from:

Computed tomography was introduced in the:

Another name for the CT table is the:

Electron-beam CT does not use an x-ray tube.

The CT system's accuracy can be determined by seeing if:

The detector found between the patient and the detectors is the:

Logarithmic conversion produces the linear attenuation coefficient data.

Based on the Hounsfield scale,the CT number of air is:

Each major development in beam and detector geometry is called a:

Most modern CT scanners are based on _______________________ technology.

Filtered back projection is used to analyze the _ data for one slice to determine the __________________.

As the WW changes,the CT image's:

Which of the following data needs to be known to perform an attenuation calculation?

The limiting factor for contrast resolution is:

The midpoint of the range of CT numbers to be displayed in the image is the:

The process that allows image data to be displayed in coronal or sagittal planes is:

Introduction to the Imaging Sciences

Structure of the Atom

Electromagnetic and Particulate Radiation

X-Ray Circuit

The X-Ray Tube

X-Ray Production

X-Ray Interactions With Matter

Image Production

Image Characteristics

Radiographic Exposure Technique

Scatter Control

Image Receptors

Automatic Exposure Control

Image Intensified Fluoroscopy

Additional Equipment

Filters

Exam 16: Computed Tomography

CT examinations currently account for approximately ________ of the U.S.population's radiation exposure resulting from medical procedures.

Also known as high-contrast resolution,this quality determines the system's ability to distinguish between very different tissue types as they get closer together.

With multislice CT,additional rows of detectors are added along the:

The actual anatomy being imaged for the CT study is determined by the:

An image with a WW of 200 and a WL of 50 produces an image that displays pixels with CT numbers ranging from:

Computed tomography was introduced in the:

Another name for the CT table is the:

Electron-beam CT does not use an x-ray tube.

The CT system's accuracy can be determined by seeing if:

The detector found between the patient and the detectors is the:

Logarithmic conversion produces the linear attenuation coefficient data.

Based on the Hounsfield scale,the CT number of air is:

Each major development in beam and detector geometry is called a:

Most modern CT scanners are based on _______________________ technology.

Filtered back projection is used to analyze the _____ data for one slice to determine the ______________________.

As the WW changes,the CT image's:

Which of the following data needs to be known to perform an attenuation calculation?

The limiting factor for contrast resolution is:

The midpoint of the range of CT numbers to be displayed in the image is the:

The process that allows image data to be displayed in coronal or sagittal planes is:

Introduction to the Imaging Sciences

Structure of the Atom

Electromagnetic and Particulate Radiation

X-Ray Circuit

The X-Ray Tube

X-Ray Production

X-Ray Interactions With Matter

Image Production

Image Characteristics

Radiographic Exposure Technique

Scatter Control

Image Receptors

Automatic Exposure Control

Image Intensified Fluoroscopy

Additional Equipment

Filters

Filtered back projection is used to analyze the _ data for one slice to determine the __________________.