Question 1

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 2

A change in any factor that has more x-ray photons reaching the detector will result in an image with decreased

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

As a result of using multiple rows of detectors,the x-ray beam becomes wider to accommodate for the divergence of the x-rays and is called

Accepted Answer

A) spiral CT 
B) multislice CT 
C) slip-ring technology 
D) cone beam 
A) spiral CT 
B) multislice CT 
C) slip-ring technology 
D) cone beam

Question 4

The grainy appearance of a CT image that is due to the random variations of CT numbers is

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 5

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 6

Prior to spiral CT,the patient moved through the gantry one small increment or step at a time.

Accepted Answer

A) True 
 B)False

Question 7

This is the most common reconstruction algorithm used in CT

Accepted Answer

A) Array processor 
B) Algorithm 
C) Filtered back projection 
D) Image data 
A) Array processor 
B) Algorithm 
C) Filtered back projection 
D) Image data

Question 8

The CT number of water is

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 9

Overlapping slices occur with a

Accepted Answer

A) pitch of 0 
B) pitch of 0.5 
C) pitch of 1 
D) pitch of 2 
A) pitch of 0 
B) pitch of 0.5 
C) pitch of 1 
D) pitch of 2

Question 10

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 11

This refers to all the settings that must be determined for a CT imaging study

Accepted Answer

A) Protocol 
B) SFOV 
C) DFOV 
D) Pitch 
A) Protocol 
B) SFOV 
C) DFOV 
D) Pitch

Question 12

The collimator that limits the patient's radiation exposure is the

Accepted Answer

A) prepatient collimator 
B) postpatient collimator 
C) bow tie filter 
D) A and B 
A) prepatient collimator 
B) postpatient collimator 
C) bow tie filter 
D) A and B

Question 13

Slices of anatomy that go from head to foot are

Accepted Answer

A) coronal 
B) sagittal 
C) transverse (axial) 
A) coronal 
B) sagittal 
C) transverse (axial)

Question 14

This translate-rotate scanner used a single detector

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

The image matrix for CT is __________ than the image matrix for digital radiography

Accepted Answer

A) smaller 
B) larger 
C) the same as 
A) smaller 
B) larger 
C) the same as

Question 16

Which of the following is true concerning dual source CT units?

Accepted Answer

A) Dual source CT units contain two sets of tube-detector pairs. 
B) Dual source CT units have quicker scan time. 
C) Dual source CT units require less patient dose due to its design. 
D) Dual source CT units have better ability to differentiate between tissues than standard 
E) All of the above. 
A) Dual source CT units contain two sets of tube-detector pairs. 
B) Dual source CT units have quicker scan time. 
C) Dual source CT units require less patient dose due to its design. 
D) Dual source CT units have better ability to differentiate between tissues than standard 
E) All of the above.

Question 17

The number of rows and columns that make up the digital image is the

Accepted Answer

A) matrix 
B) pixel 
C) voxel 
D) voxel volume 
A) matrix 
B) pixel 
C) voxel 
D) voxel volume

Question 18

This translate-rotate scanner used approximately 30 detectors and a narrow fan beam.

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 19

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

Accepted Answer

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

Question 20

This CT scanner took approximately 30 seconds 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

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

A change in any factor that has more x-ray photons reaching the detector will result in an image with decreased

As a result of using multiple rows of detectors,the x-ray beam becomes wider to accommodate for the divergence of the x-rays and is called

The grainy appearance of a CT image that is due to the random variations of CT numbers is

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

Prior to spiral CT,the patient moved through the gantry one small increment or step at a time.

This is the most common reconstruction algorithm used in CT

The CT number of water is

Overlapping slices occur with a

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

This refers to all the settings that must be determined for a CT imaging study

The collimator that limits the patient's radiation exposure is the

Slices of anatomy that go from head to foot are

This translate-rotate scanner used a single detector

The image matrix for CT is __________ than the image matrix for digital radiography

Which of the following is true concerning dual source CT units?

The number of rows and columns that make up the digital image is the

This translate-rotate scanner used approximately 30 detectors and a narrow fan beam.

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

This CT scanner took approximately 30 seconds to produce a single image.

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

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

A change in any factor that has more x-ray photons reaching the detector will result in an image with decreased

As a result of using multiple rows of detectors,the x-ray beam becomes wider to accommodate for the divergence of the x-rays and is called

The grainy appearance of a CT image that is due to the random variations of CT numbers is

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

Prior to spiral CT,the patient moved through the gantry one small increment or step at a time.

This is the most common reconstruction algorithm used in CT

The CT number of water is

Overlapping slices occur with a

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

This refers to all the settings that must be determined for a CT imaging study

The collimator that limits the patient's radiation exposure is the

Slices of anatomy that go from head to foot are

This translate-rotate scanner used a single detector

The image matrix for CT is __________ than the image matrix for digital radiography

Which of the following is true concerning dual source CT units?

The number of rows and columns that make up the digital image is the

This translate-rotate scanner used approximately 30 detectors and a narrow fan beam.

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

This CT scanner took approximately 30 seconds to produce a single image.

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