Question 1

A tissue that attenuates more 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 2

This quality determines the system's ability to distinguish between very similar tissues.

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

A pitch of 1 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 4

The CT number is the same as an attenuation coefficient.

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A)  thickness of the part 
B)  age of the patient 
C)  anatomy being imaged 
D)  A and C 
A)  thickness of the part 
B)  age of the patient 
C)  anatomy being imaged 
D)  A and C

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

This quality determines the system's ability to distinguish between very similar tissues.

A pitch of 1 indicates that with each rotation of the tube:

The CT number is the same as an attenuation coefficient.

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

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

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

This quality determines the system's ability to distinguish between very similar tissues.

A pitch of 1 indicates that with each rotation of the tube:

The CT number is the same as an attenuation coefficient.

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

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