Question 1

The collimator that controls how much of the detector is exposed is the

Accepted Answer

A)  prepatient collimator 
B)  postpatient collimator 
C)  bowtie filter 
D)  prepatient collimator and postpatient collimator 
A)  prepatient collimator 
B)  postpatient collimator 
C)  bowtie filter 
D)  prepatient collimator and postpatient collimator

Question 2

Automatic tube current modulation is a method
1) to reduce patient exposure
2) to improve image quality
3) similar to automatic exposure control

Accepted Answer

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

Question 3

Pitch ranges from

Accepted Answer

A)  0 to 5 
B)  0.5 to 2 
C)  1 to 5 
D)  2 to 4 
A)  0 to 5 
B)  0.5 to 2 
C)  1 to 5 
D)  2 to 4

Question 4

This advancement has the tube rotating inside the gantry while the patient and table move through the gantry in a continuous motion.

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 5

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)  it improves spatial resolution 
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)  it improves spatial resolution

Question 6

For CT, the filter placed between the tube and patient is shaped like a

Accepted Answer

A)  hat 
B)  bowtie 
C)  fish 
D)  necktie 
A)  hat 
B)  bowtie 
C)  fish 
D)  necktie

Question 7

Which of the following statements is true regarding CT imaging?

Accepted Answer

A)  Spatial resolution is significantly better than radiographic imaging 
B)  Contrast resolution is significantly better than radiographic imaging 
C)  Noise has minimal effect on the CT image 
D)  All of these statements are true 
A)  Spatial resolution is significantly better than radiographic imaging 
B)  Contrast resolution is significantly better than radiographic imaging 
C)  Noise has minimal effect on the CT image 
D)  All of these statements are true

Question 8

Based on the Hounsfield scale, the CT number of bone is approximately

Accepted Answer

A)  -1000 
B)  0 
C)  1000 
D)  None of these 
A)  -1000 
B)  0 
C)  1000 
D)  None of these

Question 9

Image postprocessing results in the image data changing.

Accepted Answer

A) True 
 B)False

Question 10

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 these 
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 these

Question 11

The formula for dose length product (DLP) is

Accepted Answer

A)  DLP = CTDIvol x scan length of exposure 
B)  DLP = CTDIvol + scan length of exposure 
C)  DLP = CTDIvol - scan length of exposure 
D)  DLP = CTDIvol / scan length of exposure 
A)  DLP = CTDIvol x scan length of exposure 
B)  DLP = CTDIvol + scan length of exposure 
C)  DLP = CTDIvol - scan length of exposure 
D)  DLP = CTDIvol / scan length of exposure

Question 12

Slices of anatomy that are reformatted to go from side to side are

Accepted Answer

A)  coronal 
B)  sagittal 
C)  axial 
D)  linear 
A)  coronal 
B)  sagittal 
C)  axial 
D)  linear

Question 13

The dose report

Accepted Answer

A)  displays the CTDIvol and DLP indices before and after the CT study is performed 
B)  is sent to PACS with the rest of the patient's CT study 
C)  is a federal requirement since 2002 
D)  All of these 
A)  displays the CTDIvol and DLP indices before and after the CT study is performed 
B)  is sent to PACS with the rest of the patient's CT study 
C)  is a federal requirement since 2002 
D)  All of these

Question 14

Which of the following data needs to be known to perform an attenuation calculation?
1) Thickness of the part
2) Original x-ray beam intensity
3) The intensity of the transmitted radiation (as measured by the detector)

Accepted Answer

A)  thickness of the part and original x-ray beam intensity only 
B)  thickness of the part and the intensity of the transmitted radiation (as measured by the detector) only 
C)  original x-ray beam intensity and the intensity of the transmitted radiation (as measured by the detector) only 
D)  thickness of the part, original x-ray beam intensity, and the intensity of the transmitted radiation (as measured by the detector) 
A)  thickness of the part and original x-ray beam intensity only 
B)  thickness of the part and the intensity of the transmitted radiation (as measured by the detector) only 
C)  original x-ray beam intensity and the intensity of the transmitted radiation (as measured by the detector) only 
D)  thickness of the part, original x-ray beam intensity, and the intensity of the transmitted radiation (as measured by the detector)

Question 15

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 16

Using a lower mA increases

Accepted Answer

A)  noise 
B)  spatial resolution 
C)  contrast resolution 
D)  all of these 
A)  noise 
B)  spatial resolution 
C)  contrast resolution 
D)  all of these

Question 17

The major development for the first three generations of CT scanners was the reduction in patient exposure.

Accepted Answer

A) True 
 B)False

Question 18

Determining the CT numbers that will be visible in the image 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 19

The component of the computer dedicated to performing the enormous number of calculations necessary for CT is the

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 20

The raw data is the

Accepted Answer

A)  measure of the radiation detected 
B)  measure of the primary radiation 
C)  digitized linear attenuation coefficient values 
D)  none of these 
A)  measure of the radiation detected 
B)  measure of the primary radiation 
C)  digitized linear attenuation coefficient values 
D)  none of these

The collimator that controls how much of the detector is exposed is the

Automatic tube current modulation is a method 1) to reduce patient exposure 2) to improve image quality 3) similar to automatic exposure control

Pitch ranges from

This advancement has the tube rotating inside the gantry while the patient and table move through the gantry in a continuous motion.

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

For CT, the filter placed between the tube and patient is shaped like a

Which of the following statements is true regarding CT imaging?

Based on the Hounsfield scale, the CT number of bone is approximately

Image postprocessing results in the image data changing.

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

The formula for dose length product (DLP) is

Slices of anatomy that are reformatted to go from side to side are

The dose report

Which of the following data needs to be known to perform an attenuation calculation? 1) Thickness of the part 2) Original x-ray beam intensity 3) The intensity of the transmitted radiation (as measured by the detector)

DAS stands for

Using a lower mA increases

The major development for the first three generations of CT scanners was the reduction in patient exposure.

Determining the CT numbers that will be visible in the image is

The component of the computer dedicated to performing the enormous number of calculations necessary for CT is the

The raw data is the

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

Digital Image Receptors

Radiographic Exposure Technique

Scatter Control

Exposure Technique Selection

Film-Screen Imaging

Fluoroscopic Imaging

Additional Equipment

Filters

Exam 17: Computed Tomography

The collimator that controls how much of the detector is exposed is the

Automatic tube current modulation is a method 1) to reduce patient exposure 2) to improve image quality 3) similar to automatic exposure control

Pitch ranges from

This advancement has the tube rotating inside the gantry while the patient and table move through the gantry in a continuous motion.

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

For CT, the filter placed between the tube and patient is shaped like a

Which of the following statements is true regarding CT imaging?

Based on the Hounsfield scale, the CT number of bone is approximately

Image postprocessing results in the image data changing.

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

The formula for dose length product (DLP) is

Slices of anatomy that are reformatted to go from side to side are

The dose report

Which of the following data needs to be known to perform an attenuation calculation? 1) Thickness of the part 2) Original x-ray beam intensity 3) The intensity of the transmitted radiation (as measured by the detector)

DAS stands for

Using a lower mA increases

The major development for the first three generations of CT scanners was the reduction in patient exposure.

Determining the CT numbers that will be visible in the image is

The component of the computer dedicated to performing the enormous number of calculations necessary for CT is the

The raw data is the

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

Digital Image Receptors

Radiographic Exposure Technique

Scatter Control

Exposure Technique Selection

Film-Screen Imaging

Fluoroscopic Imaging

Additional Equipment

Filters