Question 1

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

Accepted Answer

A) annotation 
B) windowing 
C) region of interest (ROI) 
D) multiplanar reformation (MPR) 
A) annotation 
B) windowing 
C) region of interest (ROI) 
D) multiplanar reformation (MPR)

Question 2

A pitch of 2 indicates that with each rotation of the tube

Accepted Answer

A) the table is moving farther than the slice thickness 
B) the table is moving less than the slice thickness 
C) the table is moving the same distance as the slice thickness 
D) None of the above 
A) the table is moving farther than the slice thickness 
B) the table is moving less than the slice thickness 
C) the table is moving the same distance as the slice thickness 
D) None of the above

Question 3

This CT scanner took approximately 5 minutes to produce a single image.

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 4

The range of CT numbers visible in the CT image is determined by 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 5

EBCT scanners are the only scanners that are fast enough to image the heart.

Accepted Answer

A) True 
 B)False

Question 6

This collimator is located between the tube and the patient

Accepted Answer

A) Prepatient collimator 
B) Postpatient collimator 
C) Bowtie filter 
D) A and B 
A) Prepatient collimator 
B) Postpatient collimator 
C) Bowtie filter 
D) A and B

Question 7

The area of anatomy seen on the monitor is the

Accepted Answer

A) protocol 
B) scan field of view (SFOV) 
C) display field of view (DFOV) 
D) pitch 
A) protocol 
B) scan field of view (SFOV) 
C) display field of view (DFOV) 
D) pitch

Question 8

The linear attenuation coefficient is

Accepted Answer

A) the measure of the probability that the x-ray beam will interact with the material it is in while traveling in a straight path 
B) based on both the characteristics of the material and the energy of the x-ray photons 
C) Symbolized by the Greek letter mu,which is written µ 
D) Symbolized by the Greek letter beta,which is written b 
E) A,B,and C
F)A,B,and D 
A) the measure of the probability that the x-ray beam will interact with the material it is in while traveling in a straight path 
B) based on both the characteristics of the material and the energy of the x-ray photons 
C) Symbolized by the Greek letter mu,which is written µ 
D) Symbolized by the Greek letter beta,which is written b 
E) A,B,and C
F)A,B,and D

Question 9

This is the only generation of CT scanners that used parallel-beam geometry.

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 10

Angular automatic tube current modulation is

Accepted Answer

A) in-plane 
B) through-plane 
C) automatically controls tube current along the X-Y axis 
D) automatically controls tube current along the Z axis 
E) A and C
F)B and D 
A) in-plane 
B) through-plane 
C) automatically controls tube current along the X-Y axis 
D) automatically controls tube current along the Z axis 
E) A and C
F)B and D

Question 11

The patient must be centered in the CT gantry isocenter for accurate imaging of the anatomy.

Accepted Answer

A) True 
 B)False

Question 12

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 13

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 14

A tissue that attenuates fewer x-rays than water has a CT number

Accepted Answer

A) 0 
B) greater than 0 
C) less than 0 
D) unable to determine unless more is known 
A) 0 
B) greater than 0 
C) less than 0 
D) unable to determine unless more is known

Question 15

Using a large matrix and thin slices improves

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 16

The transmission value for a single detector is a

Accepted Answer

A) view 
B) ray 
C) profile 
D) all of the above 
A) view 
B) ray 
C) profile 
D) all of the above

Question 17

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 18

The result of changing window level and width of the CT image is that the image data has been permanently changed.

Accepted Answer

A) True 
 B)False

Question 19

When the voxel is large enough to contain different types of tissues,the CT number will be an average of the various tissues' attenuation characteristics.This produces a ____________________

Accepted Answer

A) streak artifact 
B) ring artifact 
C) partial-volume artifact 
D) beam-hardening artifact 
A) streak artifact 
B) ring artifact 
C) partial-volume artifact 
D) beam-hardening artifact

Question 20

How will a pixel with a CT number of 250 appear if the WW is 200 and the WL is 50?

Accepted Answer

A) Black 
B) White 
C) Gray 
D) It is impossible to say 
A) Black 
B) White 
C) Gray 
D) It is impossible to say

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

A pitch of 2 indicates that with each rotation of the tube

This CT scanner took approximately 5 minutes to produce a single image.

The range of CT numbers visible in the CT image is determined by the

EBCT scanners are the only scanners that are fast enough to image the heart.

This collimator is located between the tube and the patient

The area of anatomy seen on the monitor is the

The linear attenuation coefficient is

This is the only generation of CT scanners that used parallel-beam geometry.

Angular automatic tube current modulation is

The patient must be centered in the CT gantry isocenter for accurate imaging of the anatomy.

Another name for the CT table is the

The limiting factor for contrast resolution is

A tissue that attenuates fewer x-rays than water has a CT number

Using a large matrix and thin slices improves

The transmission value for a single detector is a

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

The result of changing window level and width of the CT image is that the image data has been permanently changed.

When the voxel is large enough to contain different types of tissues,the CT number will be an average of the various tissues' attenuation characteristics.This produces a ____________________

How will a pixel with a CT number of 250 appear if the WW is 200 and the WL is 50?

Introduction to the Imaging Sciences

Structure of the Atom

Electromagnetic and Particulate Radiation

The X-Ray Circuit

The X-Ray Tube

X-Ray Production

X-Ray Interactions With Matter

Image Production

Image Quality and Characteristics

Radiographic Exposure Technique

Scatter Control

Image Receptors

Exposure Technique Selection

Image Intensified Fluoroscopy

Additional Equipment

Filters

Exam 16: Computed Tomography

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

A pitch of 2 indicates that with each rotation of the tube

This CT scanner took approximately 5 minutes to produce a single image.

The range of CT numbers visible in the CT image is determined by the

EBCT scanners are the only scanners that are fast enough to image the heart.

This collimator is located between the tube and the patient

The area of anatomy seen on the monitor is the

The linear attenuation coefficient is

This is the only generation of CT scanners that used parallel-beam geometry.

Angular automatic tube current modulation is

The patient must be centered in the CT gantry isocenter for accurate imaging of the anatomy.

Another name for the CT table is the

The limiting factor for contrast resolution is

A tissue that attenuates fewer x-rays than water has a CT number

Using a large matrix and thin slices improves

The transmission value for a single detector is a

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

The result of changing window level and width of the CT image is that the image data has been permanently changed.

When the voxel is large enough to contain different types of tissues,the CT number will be an average of the various tissues' attenuation characteristics.This produces a ____________________

How will a pixel with a CT number of 250 appear if the WW is 200 and the WL is 50?

Introduction to the Imaging Sciences

Structure of the Atom

Electromagnetic and Particulate Radiation

The X-Ray Circuit

The X-Ray Tube

X-Ray Production

X-Ray Interactions With Matter

Image Production

Image Quality and Characteristics

Radiographic Exposure Technique

Scatter Control

Image Receptors

Exposure Technique Selection

Image Intensified Fluoroscopy

Additional Equipment

Filters