Question 1

The scintillation-type detector is commonly used in today's CT scanner.

Accepted Answer

A) True 
 B)False

Question 2

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 3

Filtered back projection uses the bowtie filter to reconstruct the CT image.

Accepted Answer

A) True 
 B)False

Question 4

Scan time remains constant for all CT studies.

Accepted Answer

A) True 
 B)False

Question 5

Slices of anatomy that go from front to back are:

Accepted Answer

A)  coronal 
B)  sagittal 
C)  axial 
A)  coronal 
B)  sagittal 
C)  axial

Question 6

DAS stands for:

Accepted Answer

A)  digital absorption system 
B)  data acquisition system 
C)  diode acquisition system 
D)  data absorption system 
A)  digital absorption system 
B)  data acquisition system 
C)  diode acquisition system 
D)  data absorption system

Question 7

Pediatric protocols are unnecessary because the equipment will always adjust for the smaller patient size.

Accepted Answer

A) True 
 B)False

Question 8

This is calculated by knowing the dimensions of the pixel and the slice thickness.

Accepted Answer

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

Question 9

Using a lower mA increases:

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 10

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

Question 11

Automatic tube current modulation is a method:

Accepted Answer

A)  to reduce patient exposure 
B)  to improve image quality 
C)  similar to automatic exposure control 
D)  A and C 
A)  to reduce patient exposure 
B)  to improve image quality 
C)  similar to automatic exposure control 
D)  A and C

Question 12

The edge enhancement and smoothing filters change the visibility of noise and the spatial resolution.

Accepted Answer

A) True 
 B)False

Question 13

Adding a printed comment or label to the image is:

Accepted Answer

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

Question 14

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 15

Because of the minimal amount of scatter radiation produced during a CT scan,there is no need to be concerned with the protection of others who must remain in the room during a CT scan.

Accepted Answer

A) True 
 B)False

Question 16

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 17

Image postprocessing results in the image data changing.

Accepted Answer

A) True 
 B)False

Question 18

The x-ray tube used in CT systems has a larger-diameter anode because:

Accepted Answer

A)  larger images are created with CT 
B)  the tube is bigger and the anode is proportional 
C)  CT studies produce enormous amounts of heat 
D)  none of the above 
A)  larger images are created with CT 
B)  the tube is bigger and the anode is proportional 
C)  CT studies produce enormous amounts of heat 
D)  none of the above

Question 19

Structures such as the breast or thyroid cannot be shielded when they are in the SFOV because an artifact would be created.

Accepted Answer

A) True 
 B)False

Question 20

This scanner uses a wide fan beam and a rotating array of detectors.

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

The scintillation-type detector is commonly used in today's CT scanner.

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

Filtered back projection uses the bowtie filter to reconstruct the CT image.

Scan time remains constant for all CT studies.

Slices of anatomy that go from front to back are:

DAS stands for:

Pediatric protocols are unnecessary because the equipment will always adjust for the smaller patient size.

This is calculated by knowing the dimensions of the pixel and the slice thickness.

Using a lower mA increases:

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

Automatic tube current modulation is a method:

The edge enhancement and smoothing filters change the visibility of noise and the spatial resolution.

Adding a printed comment or label to the image is:

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

Because of the minimal amount of scatter radiation produced during a CT scan,there is no need to be concerned with the protection of others who must remain in the room during a CT scan.

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

Image postprocessing results in the image data changing.

The x-ray tube used in CT systems has a larger-diameter anode because:

Structures such as the breast or thyroid cannot be shielded when they are in the SFOV because an artifact would be created.

This scanner uses a wide fan beam and a rotating array of detectors.

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

The scintillation-type detector is commonly used in today's CT scanner.

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

Filtered back projection uses the bowtie filter to reconstruct the CT image.

Scan time remains constant for all CT studies.

Slices of anatomy that go from front to back are:

DAS stands for:

Pediatric protocols are unnecessary because the equipment will always adjust for the smaller patient size.

This is calculated by knowing the dimensions of the pixel and the slice thickness.

Using a lower mA increases:

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

Automatic tube current modulation is a method:

The edge enhancement and smoothing filters change the visibility of noise and the spatial resolution.

Adding a printed comment or label to the image is:

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

Because of the minimal amount of scatter radiation produced during a CT scan,there is no need to be concerned with the protection of others who must remain in the room during a CT scan.

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

Image postprocessing results in the image data changing.

The x-ray tube used in CT systems has a larger-diameter anode because:

Structures such as the breast or thyroid cannot be shielded when they are in the SFOV because an artifact would be created.

This scanner uses a wide fan beam and a rotating array of detectors.

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