Question 1

A disadvantage to having image overlap on CT images is the possibility of artificially creating small lesions.

Accepted Answer

A) True 
 B)False  False

Question 2

Energies required for typical PET/CT studies of the body will be in the range of

Accepted Answer

A)  20 to 30 kVp. 
B)  40 to 75 kVp. 
C)  80 to 140 kVp. 
D)  145 to 160 kVp. 
A)  20 to 30 kVp. 
B)  40 to 75 kVp. 
C)  80 to 140 kVp. 
D)  145 to 160 kVp. C

Question 3

In helical CT, pitch is defined as

Accepted Answer

A)  the ratio of the patient's movement through the gantry during one 360-degree beam rotation relative to the beam collimation. 
B)  the total time for a patient to move through the gantry during a CT scan. 
C)  the ratio of the beam collimation relative to the mAs for a CT scan. 
D)  the coordination of a patient's possible movement, 
E) g., breathing, during the CT scan relative to slice thickness. 
A)  the ratio of the patient's movement through the gantry during one 360-degree beam rotation relative to the beam collimation. 
B)  the total time for a patient to move through the gantry during a CT scan. 
C)  the ratio of the beam collimation relative to the mAs for a CT scan. 
D)  the coordination of a patient's possible movement, 
E) g., breathing, during the CT scan relative to slice thickness. A

Question 4

In an x-ray tube, of the energy applied to the system, the percentage of x-rays that exit is

Accepted Answer

A)  1%. 
B)  10%. 
C)  50%. 
D)  99%. 
A)  1%. 
B)  10%. 
C)  50%. 
D)  99%.

Question 5

The purpose of using a filter in CT scanning is

Accepted Answer

A)  to absorb the very-low-energy x-rays. 
B)  to act as an upper level discriminator. 
C)  to act as a window. 
D)  To attenuate the high-energy x-rays. 
A)  to absorb the very-low-energy x-rays. 
B)  to act as an upper level discriminator. 
C)  to act as a window. 
D)  To attenuate the high-energy x-rays.

Question 6

All of the following are true about the kVp setting EXCEPT

Accepted Answer

A)  it selects the maximum possible energy of the x-ray beam. 
B)  it defines the fraction of photons that will reach the detectors. 
C)  it affects the radiation exposure to the patient. 
D)  it increases beam hardening. 
A)  it selects the maximum possible energy of the x-ray beam. 
B)  it defines the fraction of photons that will reach the detectors. 
C)  it affects the radiation exposure to the patient. 
D)  it increases beam hardening.

Question 7

What is the CT number for water?

Accepted Answer

A)  0 
B)  10 
C)  100 
D)  1000 
A)  0 
B)  10 
C)  100 
D)  1000

Question 8

Computed tomography (CT) scanning accomplishes all of the following EXCEPT

Accepted Answer

A)  minimal superimposition of tissues. 
B)  improved contrast resolution. 
C)  reduction of radiation dose compared to conventional radiography. 
D)  differentiation of tissue densities. 
A)  minimal superimposition of tissues. 
B)  improved contrast resolution. 
C)  reduction of radiation dose compared to conventional radiography. 
D)  differentiation of tissue densities.

Question 9

In an x-ray tube, a low kVp results in

Accepted Answer

A)  high-energy Bremsstrahlung x-rays. 
B)  low-energy Bremsstrahlung x-rays. 
C)  fewer Bremsstrahlung x-rays. 
D)  an increase in tungsten characteristic x-rays. 
A)  high-energy Bremsstrahlung x-rays. 
B)  low-energy Bremsstrahlung x-rays. 
C)  fewer Bremsstrahlung x-rays. 
D)  an increase in tungsten characteristic x-rays.

Question 10

In high-performance CT scanners, the speed of the data transfer from the detector array determines the maximum resolution.

Accepted Answer

A) True 
 B)False

Question 11

Collimators in CT scanning are used to do all of the following EXCEPT

Accepted Answer

A)  limit the beam size. 
B)  reduce scattered x-rays. 
C)  define slice thickness. 
D)  offset the alignment of the tube and detector array to optimize the beam location. 
A)  limit the beam size. 
B)  reduce scattered x-rays. 
C)  define slice thickness. 
D)  offset the alignment of the tube and detector array to optimize the beam location.

Question 12

Important technical developments that define current helical CT systems include all of the following EXCEPT

Accepted Answer

A)  continuous reduction in radiation of the x-ray tube. 
B)  continuous-motion gantry using slip-ring technology. 
C)  continuous motion of the imaging table. 
D)  continuous data transfer from the detector array. 
A)  continuous reduction in radiation of the x-ray tube. 
B)  continuous-motion gantry using slip-ring technology. 
C)  continuous motion of the imaging table. 
D)  continuous data transfer from the detector array.

Question 13

What is the purpose of administering a contrast agent for a CT procedure?

Accepted Answer

A)  Reduce patient dose for longer scans that require thinner slicers 
B)  Reduce streaking artifacts when scanning high-density objects 
C)  Reduce attenuating properties of tissues with wide variances in density 
D)  Enhance detection of lesions and aid in defining normal structures 
A)  Reduce patient dose for longer scans that require thinner slicers 
B)  Reduce streaking artifacts when scanning high-density objects 
C)  Reduce attenuating properties of tissues with wide variances in density 
D)  Enhance detection of lesions and aid in defining normal structures

Question 14

In a CT scanner, the oil bath that may surround the rotating anode tubes serves to

Accepted Answer

A)  make the tubes rotate more quickly. 
B)  make the tubes rotate more smoothly. 
C)  cool the tubes. 
D)  provide efficient conduction of the current. 
A)  make the tubes rotate more quickly. 
B)  make the tubes rotate more smoothly. 
C)  cool the tubes. 
D)  provide efficient conduction of the current.

Question 15

In an x-ray tube, the anode, for the most part, is most commonly constructed from

Accepted Answer

A)  tungsten. 
B)  lead. 
C)  rhenium. 
D)  silver. 
A)  tungsten. 
B)  lead. 
C)  rhenium. 
D)  silver.

Question 16

What is a reconstruction kernel?

Accepted Answer

A)  A unit of data in a reconstructed CT image 
B)  The entire data set used to produce reconstructed images in CT 
C)  A measurement used to determine the data set used for CT reconstruction 
D)  An algorithm that defines the clinical application and amount of image smoothing applied in the reconstruction 
A)  A unit of data in a reconstructed CT image 
B)  The entire data set used to produce reconstructed images in CT 
C)  A measurement used to determine the data set used for CT reconstruction 
D)  An algorithm that defines the clinical application and amount of image smoothing applied in the reconstruction

Question 17

Which of the following restricts the width and shapes the beam to the area of interest for a single rotation of the tube and detectors around the patient?

Accepted Answer

A)  Prepatient collimators 
B)  Postpatient collimators 
C)  Pitch 
D)  Rotation speed 
A)  Prepatient collimators 
B)  Postpatient collimators 
C)  Pitch 
D)  Rotation speed

Question 18

In an x-ray tube, a high kVp results in

Accepted Answer

A)  low-energy Bremsstrahlung x-rays. 
B)  a decrease in tungsten characteristic x-rays. 
C)  an increase in tungsten characteristic x-rays. 
D)  fewer Bremsstrahlung x-rays. 
A)  low-energy Bremsstrahlung x-rays. 
B)  a decrease in tungsten characteristic x-rays. 
C)  an increase in tungsten characteristic x-rays. 
D)  fewer Bremsstrahlung x-rays.

Question 19

Thin collimation has an advantage because it results in faster scanning time.

Accepted Answer

A) True 
 B)False

Question 20

The slice thickness that may be reconstructed can be up to half as thin as the collimator width.

Accepted Answer

A) True 
 B)False

Exam 12: Ct Physics and Instrumentation

A disadvantage to having image overlap on CT images is the possibility of artificially creating small lesions.

Energies required for typical PET/CT studies of the body will be in the range of

In helical CT, pitch is defined as

In an x-ray tube, of the energy applied to the system, the percentage of x-rays that exit is

The purpose of using a filter in CT scanning is

All of the following are true about the kVp setting EXCEPT

What is the CT number for water?

Computed tomography (CT) scanning accomplishes all of the following EXCEPT

In an x-ray tube, a low kVp results in

In high-performance CT scanners, the speed of the data transfer from the detector array determines the maximum resolution.

Collimators in CT scanning are used to do all of the following EXCEPT

Important technical developments that define current helical CT systems include all of the following EXCEPT

What is the purpose of administering a contrast agent for a CT procedure?

In a CT scanner, the oil bath that may surround the rotating anode tubes serves to

In an x-ray tube, the anode, for the most part, is most commonly constructed from

What is a reconstruction kernel?

Which of the following restricts the width and shapes the beam to the area of interest for a single rotation of the tube and detectors around the patient?

In an x-ray tube, a high kVp results in

Thin collimation has an advantage because it results in faster scanning time.

The slice thickness that may be reconstructed can be up to half as thin as the collimator width.

Mathematics and Statistics

Cell and Molecular Biology

Chemistrybiochemistry

Radiochemistryradiopharmacology

Radiation Safety in Nuclear Medicine

Patient Care

Department Administration

Clinical Research

Health Informatics in Imaging

Physics of Nuclear Medicine

Instrumentation

Pet Instrumentation

Principles of Magnetic Resonance Imaging

Clinical Petct in Oncology

Central Nervous System

Endocrine System

Respiratory System

Cardiovascular System

Gastrointestinal System

Genitourinary System

Skeletal System

Inflammatory Tumoroncology Imaging and Therapy

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