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NMTCB PET Exam Questions With 100%
Correct Answers Guaranteed Pass.
The exposure rate of an activity of 1 millicurie (mCi) measured at 1 centimeter (cm) is called -
Answer✔- The exposure rate constant (ERC)
For positron emitters, the exposure rate constant (ERC) is about 6 R/h per millicurie at 1 cm. The
exposure rate of a 10 mCi dose of F-18 is approximately six times greater than that of a 10 mCi
dose of Tc-99 m at a distance of approxi- mately 8 inches.
Quantitative bias that refers to the underestimation of counts density which differs from what
they should be is called: - Answer✔Partial-volume effect
PVE is caused by the finite spatial resolution of the imaging system which reveals how far the
signal "spills out" around its actual location. The signal spreading falsely increases the object
size and volume. Image sampling, where voxels in ROI include the signal from underlying
tissues, also contributes to the phenomenon known as partial-volume effect.
Truncation artifacts in PET/CT imaging are produced by - Answer✔Difference in size of FOV
between PET and the CT
Discrepancy between fields of view (FOVs) in a PET/CT scanner—70 cm causes a truncation
artifact when imaging extends beyond the CT FOV-50 cm; as a result no attenuation correction
values for the truncated anatomy are being applied.
Dental fillings, hip prosthetics, or chemotherapy port are examples of PET/CT imaging artifacts
described as: - Answer✔Metallic implants artifacts
Metallic implants create streaking artifacts on CT images because of their high photon
absorption. Higher Hounsfield numbers consequently produce high PET attenuation coefficients
and an overestimation of PET findings.
The Property of PET detectors that allows them faster timing signals for coincidence detection
and to work at high count rates is called: - Answer✔The decay constant
The decay constant decides how long the scintillation flashes in the crystal; a short decay time
reduces detector dead time and as a result higher annihilation rates can be accepted.
The picturing, description, and measurement of biological processes at the particle and cellular
level is known as - Answer✔Molecular imaging
Radionuclide originated molecular imaging techniques such as positron emission tomography
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(PET) and single-photon emission computed tomography (SPECT) capture functional or
phenotypic changes associated with pathology and unfold the molecular abnormalities
responsible to form basis of many diseases.
A PET system capacity to distinguish between two points after image reconstruction is called: -
Answer✔Resolution
A PET system resolution, according to NEMA guidelines, is assessed by imaging a point source
in the air and reconstructing the images with no smoothing or transformation of images. The
resolution of the system is affected by the annihilation ambiguities, the detector ring diameter
and the size of the scintillation crystal.
Allergic reaction that begins within seconds/minutes of contrast media administration and
rapidly progresses to cause airway constriction, skin and intestinal irritation, and altered heart
rhythms is called: - Answer✔Anaphylaxis
The first PET radiopharmaceutical to receive the U.S. Food and Drug Administration approval in
1989 was: - Answer✔Rb-82
The dose calibrator quality control procedure performed to assess the device's ability to measure
accurately a range of a low to high activities is called: - Answer✔Linearity
The following positron-emitting radionuclides are isotopes of natural elements present in most
biochemical processes EXCEPT:
(A) O-15
(B) F-18
(C) C-11
(D) N-13 - Answer✔F-18
Two photons arising from the same annihilation event and detected by two detectors within the
coincidence time-window are: - Answer✔True coincidences
Serves as the building blocks for proteins synthesis - Answer✔Amino acids
Positronium (Ps) is an arrangement of: - Answer✔An electron and a positron
The most common site of brown fat localization - Answer✔Neck
Scintillator commonly used in PET imaging that has the highest stopping power - Answer✔BGO
(bismuth germinate)
A malignant neoplasm of the skin linked with approximately 75% of skin cancer-related
mortality is called: - Answer✔Melanoma
PET tracers have demonstrated significant potential utility and application in the following
clinical areas EXCEPT:
(A) Oncology
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(B) Cardiology
(C) Pulmonology
(D) Neurology - Answer✔C - Pulmonology
The sum of the weighted equivalent doses in all the tissues and organs of the body is called: -
Answer✔Effective dose
The combined whole-body effective dose for a clinically diagnostic PET/CT is typically in the
range: - Answer✔20-30 mSv
The positron has the same mass as an electron and an electric charge of: - Answer✔+ 1
The initial diagnosis of melanoma is established by: - Answer✔Histologic evaluation
In PET scanning process raw data acquired and identified as coincidence events along their LOR
are stored in the raw data format called: - Answer✔Sinograms
Cyclotron produced positron-emitting radionuclide - Answer✔Nitrogen-13
A piece of equipment that sorts out photons of different radionuclides with different photon
energies and to separate scattered photons from the useful ones is called: - Answer✔Pulse height
analyzer
DNA synthesis is a measure of cellular: - Answer✔Proliferation
The F-18 fluoride bone uptake mechanism is similar to that of: - Answer✔Tc-99 m
methylenediphosphonate (MDP)
The process by which new blood vessels are formed is called: - Answer✔Angiogenesis
Quality control procedures required for proper functioning of the survey meter -
Answer✔Calibration and constancy
The Circle of Willis is a circle of arteries that supply blood to: - Answer✔The brain
What is the purpose of the CT X-ray tube: - Answer✔Produces the X-ray
The radiodensity of distilled water at standard pressure and temperature (STP) on the Hounsfield
unit (HU) scale is equal to: - Answer✔0 HU
The dose calibrator quality control procedure testing a long-lived standard at each of the
frequently used radionuclides settings is called: - Answer✔Constancy
Which of the following radionuclides commonly used in PET imaging has the highest energy?
(A) Carbon-11
(B) Nitrogen-13
(C) Oxygen-15
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(D) Fluorine-18 - Answer✔(C) Oxygen-15 1.72 MeV
Carbon-11 0.96 MeV
Nitrogen-13 1.19 MeV
Fluorine-18 0.635 MeV
The PET scanner quality control procedure in which data are used with the transmission data in
the computation of attenuation correction factors is called: - Answer✔Blank scan
The property of the scintillation detector described as the number of scintillations produced by
each incident photon is called: - Answer✔The light output
Precursor for the synthesis of phospholipids - Answer✔Choline
The correct order of scanning when a typical PET/CT protocol is applied - Answer✔Topogram,
transmission CT, emission PET
Presence of the non-collinearity of the annihilation photons and the finite positron range are
inherent properties of positron emission tomography resulting in: - Answer✔Positional
inaccuracy
Which of the following positron-emitting nuclides has the shortest half-life?
(A) Rubidium-82
(B) Oxygen-15
(C) Nitrogen-13
(D) Carbon-11 - Answer✔(A) Rubidium-82 75 Seconds
Oxygen-15 2 minutes
Nitrogen-13 10 minutes
Carbon-11 20 minutes
What is the purpose of the cathode filament of the X-ray tube: - Answer✔Emits electrons
An oncology patient referred for a positron emission tomography scan should fast prior to his/her
appointment for at least: - Answer✔4 hours
When should Daily quality control checks on the PET scanner be performed? - Answer✔Before
the patient is injected
Patients with malignant melanoma should be scanned with their arms: - Answer✔Down
4|Page
NMTCB PET Exam Questions With 100%
Correct Answers Guaranteed Pass.
The exposure rate of an activity of 1 millicurie (mCi) measured at 1 centimeter (cm) is called -
Answer✔- The exposure rate constant (ERC)
For positron emitters, the exposure rate constant (ERC) is about 6 R/h per millicurie at 1 cm. The
exposure rate of a 10 mCi dose of F-18 is approximately six times greater than that of a 10 mCi
dose of Tc-99 m at a distance of approxi- mately 8 inches.
Quantitative bias that refers to the underestimation of counts density which differs from what
they should be is called: - Answer✔Partial-volume effect
PVE is caused by the finite spatial resolution of the imaging system which reveals how far the
signal "spills out" around its actual location. The signal spreading falsely increases the object
size and volume. Image sampling, where voxels in ROI include the signal from underlying
tissues, also contributes to the phenomenon known as partial-volume effect.
Truncation artifacts in PET/CT imaging are produced by - Answer✔Difference in size of FOV
between PET and the CT
Discrepancy between fields of view (FOVs) in a PET/CT scanner—70 cm causes a truncation
artifact when imaging extends beyond the CT FOV-50 cm; as a result no attenuation correction
values for the truncated anatomy are being applied.
Dental fillings, hip prosthetics, or chemotherapy port are examples of PET/CT imaging artifacts
described as: - Answer✔Metallic implants artifacts
Metallic implants create streaking artifacts on CT images because of their high photon
absorption. Higher Hounsfield numbers consequently produce high PET attenuation coefficients
and an overestimation of PET findings.
The Property of PET detectors that allows them faster timing signals for coincidence detection
and to work at high count rates is called: - Answer✔The decay constant
The decay constant decides how long the scintillation flashes in the crystal; a short decay time
reduces detector dead time and as a result higher annihilation rates can be accepted.
The picturing, description, and measurement of biological processes at the particle and cellular
level is known as - Answer✔Molecular imaging
Radionuclide originated molecular imaging techniques such as positron emission tomography
1|Page
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED.
(PET) and single-photon emission computed tomography (SPECT) capture functional or
phenotypic changes associated with pathology and unfold the molecular abnormalities
responsible to form basis of many diseases.
A PET system capacity to distinguish between two points after image reconstruction is called: -
Answer✔Resolution
A PET system resolution, according to NEMA guidelines, is assessed by imaging a point source
in the air and reconstructing the images with no smoothing or transformation of images. The
resolution of the system is affected by the annihilation ambiguities, the detector ring diameter
and the size of the scintillation crystal.
Allergic reaction that begins within seconds/minutes of contrast media administration and
rapidly progresses to cause airway constriction, skin and intestinal irritation, and altered heart
rhythms is called: - Answer✔Anaphylaxis
The first PET radiopharmaceutical to receive the U.S. Food and Drug Administration approval in
1989 was: - Answer✔Rb-82
The dose calibrator quality control procedure performed to assess the device's ability to measure
accurately a range of a low to high activities is called: - Answer✔Linearity
The following positron-emitting radionuclides are isotopes of natural elements present in most
biochemical processes EXCEPT:
(A) O-15
(B) F-18
(C) C-11
(D) N-13 - Answer✔F-18
Two photons arising from the same annihilation event and detected by two detectors within the
coincidence time-window are: - Answer✔True coincidences
Serves as the building blocks for proteins synthesis - Answer✔Amino acids
Positronium (Ps) is an arrangement of: - Answer✔An electron and a positron
The most common site of brown fat localization - Answer✔Neck
Scintillator commonly used in PET imaging that has the highest stopping power - Answer✔BGO
(bismuth germinate)
A malignant neoplasm of the skin linked with approximately 75% of skin cancer-related
mortality is called: - Answer✔Melanoma
PET tracers have demonstrated significant potential utility and application in the following
clinical areas EXCEPT:
(A) Oncology
2|Page
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED.
(B) Cardiology
(C) Pulmonology
(D) Neurology - Answer✔C - Pulmonology
The sum of the weighted equivalent doses in all the tissues and organs of the body is called: -
Answer✔Effective dose
The combined whole-body effective dose for a clinically diagnostic PET/CT is typically in the
range: - Answer✔20-30 mSv
The positron has the same mass as an electron and an electric charge of: - Answer✔+ 1
The initial diagnosis of melanoma is established by: - Answer✔Histologic evaluation
In PET scanning process raw data acquired and identified as coincidence events along their LOR
are stored in the raw data format called: - Answer✔Sinograms
Cyclotron produced positron-emitting radionuclide - Answer✔Nitrogen-13
A piece of equipment that sorts out photons of different radionuclides with different photon
energies and to separate scattered photons from the useful ones is called: - Answer✔Pulse height
analyzer
DNA synthesis is a measure of cellular: - Answer✔Proliferation
The F-18 fluoride bone uptake mechanism is similar to that of: - Answer✔Tc-99 m
methylenediphosphonate (MDP)
The process by which new blood vessels are formed is called: - Answer✔Angiogenesis
Quality control procedures required for proper functioning of the survey meter -
Answer✔Calibration and constancy
The Circle of Willis is a circle of arteries that supply blood to: - Answer✔The brain
What is the purpose of the CT X-ray tube: - Answer✔Produces the X-ray
The radiodensity of distilled water at standard pressure and temperature (STP) on the Hounsfield
unit (HU) scale is equal to: - Answer✔0 HU
The dose calibrator quality control procedure testing a long-lived standard at each of the
frequently used radionuclides settings is called: - Answer✔Constancy
Which of the following radionuclides commonly used in PET imaging has the highest energy?
(A) Carbon-11
(B) Nitrogen-13
(C) Oxygen-15
3|Page
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED.
(D) Fluorine-18 - Answer✔(C) Oxygen-15 1.72 MeV
Carbon-11 0.96 MeV
Nitrogen-13 1.19 MeV
Fluorine-18 0.635 MeV
The PET scanner quality control procedure in which data are used with the transmission data in
the computation of attenuation correction factors is called: - Answer✔Blank scan
The property of the scintillation detector described as the number of scintillations produced by
each incident photon is called: - Answer✔The light output
Precursor for the synthesis of phospholipids - Answer✔Choline
The correct order of scanning when a typical PET/CT protocol is applied - Answer✔Topogram,
transmission CT, emission PET
Presence of the non-collinearity of the annihilation photons and the finite positron range are
inherent properties of positron emission tomography resulting in: - Answer✔Positional
inaccuracy
Which of the following positron-emitting nuclides has the shortest half-life?
(A) Rubidium-82
(B) Oxygen-15
(C) Nitrogen-13
(D) Carbon-11 - Answer✔(A) Rubidium-82 75 Seconds
Oxygen-15 2 minutes
Nitrogen-13 10 minutes
Carbon-11 20 minutes
What is the purpose of the cathode filament of the X-ray tube: - Answer✔Emits electrons
An oncology patient referred for a positron emission tomography scan should fast prior to his/her
appointment for at least: - Answer✔4 hours
When should Daily quality control checks on the PET scanner be performed? - Answer✔Before
the patient is injected
Patients with malignant melanoma should be scanned with their arms: - Answer✔Down
4|Page
