NMTCB NUCLEAR MEDICINE EXAM
2026 DETAILED CORRECT ANSWERS
WITH RATIONALES CORRECT
VERIFIED ANSWERS 1 to 150 GRADE
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Nuclear Medicine – NMTCB Practice Examination
1. A nuclear medicine technologist performs a daily
constancy check on a dose calibrator using a long-lived
reference source. According to regulatory standards, what
is the maximum allowable deviation from the calculated
decay-corrected activity before the instrument must be
removed from service for repair or recalibration?
A. ± 2%
B. ± 5%
C. ± 10%
D. ± 20%
Correct Answer: C. Rationale: Regulatory and
quality control protocols mandate that dose calibrator
constancy, linearity, and accuracy measurements must
fall within ± 10% of the expected calculated values. Any
deviation exceeding this threshold requires immediate
corrective action or professional service.
2. During a routine quality control check of a scintillation
camera, a technologist performs an intrinsic flood using a
point source of Technetium-99m
(\(^{99\text{m}}\text{Tc}\)). Which of the following
conditions is an absolute requirement for the proper setup
of an intrinsic spatial uniformity evaluation?
, A. The collimator must be securely attached to the detector
head.
B. The collimator must be completely removed
from the detector head.
C. The point source must be placed within 10 centimetres
of the crystal surface.
D. A sheet source of Cobalt-57 (⁵⁷Co) must be positioned
directly on the detector face.
Correct Answer: B. Rationale: Intrinsic
uniformity testing evaluates the performance of the
crystal and photomultiplier tubes without the geometric
influence of a collimator. Therefore, the collimator must
be removed, and the point source must be positioned at a
distance of at least 5 times the useful field of view (UFOV)
diameter to ensure uniform photon flux across the
crystal.
3. A patient is scheduled for a 3-phase bone scan to evaluate
for suspected osteomyelitis of the right tibia. What is the
correct sequence of imaging phases and their
corresponding acquisition timing parameters?
A. Blood pool (0–60 sec), Flow (5 min), Delayed (24
hours).
B. Flow (1–2 hours), Blood pool (3–4 hours), Delayed (24
hours).
C. Flow (0–60 sec dynamic), Blood pool (1–5 min
static), Delayed (2–4 hours static).
D. Flow (10 min dynamic), Delayed (1 hour), Extended
Delayed (48 hours).
Correct Answer: C. Rationale: A standard 3-
phase bone scan begins with the flow phase (perfusion)
acquired dynamically at 1–3 seconds per frame for the
first 60 seconds. This is immediately followed by the
blood pool phase (tissue hyperemia) acquired statically
, within 1–5 minutes. The final delayed phase (skeletal
turnover) is captured 2–4 hours later.
4. A technologist elutes a Technetium-99m generator and
performs a thin-layer chromatography (TLC) test to
determine the radiochemical purity of a newly prepared
kit. If the test reveals excessive free, unbound
pertechnetate (\(^{99\text{m}}\text{TcO}_4^-\)), which
of the following biodistributions will be visible on
subsequent patient scans?
A. Intensive tracer localization restricted strictly to the
bone matrix and kidneys.
B. High uptake in the lungs, spleen, and bone marrow
from colloidal particle clumping.
C. Prominent, unwanted visualization of the
gastric mucosa, thyroid gland, and salivary
glands.
D. Diffuse, non-specific uptake localized exclusively within
the central nervous system.
Correct Answer: C. Rationale: Free pertechnetate
(\(^{99\text{m}}\text{TcO}_4^-\)) is a chemical
impurity that naturally localizes in the stomach (gastric
mucosa), thyroid, and salivary glands. High levels of this
free fraction reduce image quality by increasing
background activity and obscuring target organs,
representing poor radiochemical purity.
5. When performing a myocardial perfusion imaging (MPI)
study using a standard one-day rest/stress protocol with
\(^{99\text{m}}\text{Tc}\)-sestamibi, why is the patient
instructed to eat a light, high-fat meal or snack between
tracer injection and image acquisition?
A. To accelerate renal clearance of the tracer to prevent
bladder artifact.
B. To stimulate gallbladder contraction and
enhance clearance of hepatic activity from the
, liver and bowel.
C. To maximize the absorption of the radiopharmaceutical
directly into the coronary arteries.
D. To prevent the development of acute patient
hypoglycemia during the stress protocol.
Correct Answer: B. Rationale: Sestamibi clears
through the hepatobiliary system, causing significant
tracer accumulation in the liver and gallbladder. Eating
a high-fat snack triggers gallbladder contraction and
moves bile into the intestines, clearing high
subdiaphragmatic activity that could cause
reconstruction artifacts over the inferior wall of the
heart.
6. A technologist accidentally drops a vial containing 50 mCi
of \(^{99\text{m}}\text{Tc}\)-MDP in a hot lab corridor.
What is the immediate priority action according to
standard radiation safety and spill management protocols?
A. Evaporate the liquid completely using a commercial
high-output heat gun.
B. Clear the area, notify all personnel to leave the
immediate vicinity, and contain the spill using
absorbent pads.
C. Immediately pick up the broken glass using thin latex
gloves and throw it into a regular trash bin.
D. Flood the corridor with running water from a fire hose
to dilute the isotope into the public drainage.
Correct Answer: B. Rationale: For any
radioactive spill, the major priority rule is to clear the
room, warn others, contain the spread using absorbent
materials to prevent tracking, shield if necessary, and
systematically decontaminate while wearing personal
protective equipment.
7. According to Nuclear Regulatory Commission (NRC)
guidelines, what is the maximum allowable limit for
2026 DETAILED CORRECT ANSWERS
WITH RATIONALES CORRECT
VERIFIED ANSWERS 1 to 150 GRADE
A+ MATERIAL | INSTANT DOWNLOAD
| 100% PASS GUARANTEE
Nuclear Medicine – NMTCB Practice Examination
1. A nuclear medicine technologist performs a daily
constancy check on a dose calibrator using a long-lived
reference source. According to regulatory standards, what
is the maximum allowable deviation from the calculated
decay-corrected activity before the instrument must be
removed from service for repair or recalibration?
A. ± 2%
B. ± 5%
C. ± 10%
D. ± 20%
Correct Answer: C. Rationale: Regulatory and
quality control protocols mandate that dose calibrator
constancy, linearity, and accuracy measurements must
fall within ± 10% of the expected calculated values. Any
deviation exceeding this threshold requires immediate
corrective action or professional service.
2. During a routine quality control check of a scintillation
camera, a technologist performs an intrinsic flood using a
point source of Technetium-99m
(\(^{99\text{m}}\text{Tc}\)). Which of the following
conditions is an absolute requirement for the proper setup
of an intrinsic spatial uniformity evaluation?
, A. The collimator must be securely attached to the detector
head.
B. The collimator must be completely removed
from the detector head.
C. The point source must be placed within 10 centimetres
of the crystal surface.
D. A sheet source of Cobalt-57 (⁵⁷Co) must be positioned
directly on the detector face.
Correct Answer: B. Rationale: Intrinsic
uniformity testing evaluates the performance of the
crystal and photomultiplier tubes without the geometric
influence of a collimator. Therefore, the collimator must
be removed, and the point source must be positioned at a
distance of at least 5 times the useful field of view (UFOV)
diameter to ensure uniform photon flux across the
crystal.
3. A patient is scheduled for a 3-phase bone scan to evaluate
for suspected osteomyelitis of the right tibia. What is the
correct sequence of imaging phases and their
corresponding acquisition timing parameters?
A. Blood pool (0–60 sec), Flow (5 min), Delayed (24
hours).
B. Flow (1–2 hours), Blood pool (3–4 hours), Delayed (24
hours).
C. Flow (0–60 sec dynamic), Blood pool (1–5 min
static), Delayed (2–4 hours static).
D. Flow (10 min dynamic), Delayed (1 hour), Extended
Delayed (48 hours).
Correct Answer: C. Rationale: A standard 3-
phase bone scan begins with the flow phase (perfusion)
acquired dynamically at 1–3 seconds per frame for the
first 60 seconds. This is immediately followed by the
blood pool phase (tissue hyperemia) acquired statically
, within 1–5 minutes. The final delayed phase (skeletal
turnover) is captured 2–4 hours later.
4. A technologist elutes a Technetium-99m generator and
performs a thin-layer chromatography (TLC) test to
determine the radiochemical purity of a newly prepared
kit. If the test reveals excessive free, unbound
pertechnetate (\(^{99\text{m}}\text{TcO}_4^-\)), which
of the following biodistributions will be visible on
subsequent patient scans?
A. Intensive tracer localization restricted strictly to the
bone matrix and kidneys.
B. High uptake in the lungs, spleen, and bone marrow
from colloidal particle clumping.
C. Prominent, unwanted visualization of the
gastric mucosa, thyroid gland, and salivary
glands.
D. Diffuse, non-specific uptake localized exclusively within
the central nervous system.
Correct Answer: C. Rationale: Free pertechnetate
(\(^{99\text{m}}\text{TcO}_4^-\)) is a chemical
impurity that naturally localizes in the stomach (gastric
mucosa), thyroid, and salivary glands. High levels of this
free fraction reduce image quality by increasing
background activity and obscuring target organs,
representing poor radiochemical purity.
5. When performing a myocardial perfusion imaging (MPI)
study using a standard one-day rest/stress protocol with
\(^{99\text{m}}\text{Tc}\)-sestamibi, why is the patient
instructed to eat a light, high-fat meal or snack between
tracer injection and image acquisition?
A. To accelerate renal clearance of the tracer to prevent
bladder artifact.
B. To stimulate gallbladder contraction and
enhance clearance of hepatic activity from the
, liver and bowel.
C. To maximize the absorption of the radiopharmaceutical
directly into the coronary arteries.
D. To prevent the development of acute patient
hypoglycemia during the stress protocol.
Correct Answer: B. Rationale: Sestamibi clears
through the hepatobiliary system, causing significant
tracer accumulation in the liver and gallbladder. Eating
a high-fat snack triggers gallbladder contraction and
moves bile into the intestines, clearing high
subdiaphragmatic activity that could cause
reconstruction artifacts over the inferior wall of the
heart.
6. A technologist accidentally drops a vial containing 50 mCi
of \(^{99\text{m}}\text{Tc}\)-MDP in a hot lab corridor.
What is the immediate priority action according to
standard radiation safety and spill management protocols?
A. Evaporate the liquid completely using a commercial
high-output heat gun.
B. Clear the area, notify all personnel to leave the
immediate vicinity, and contain the spill using
absorbent pads.
C. Immediately pick up the broken glass using thin latex
gloves and throw it into a regular trash bin.
D. Flood the corridor with running water from a fire hose
to dilute the isotope into the public drainage.
Correct Answer: B. Rationale: For any
radioactive spill, the major priority rule is to clear the
room, warn others, contain the spread using absorbent
materials to prevent tracking, shield if necessary, and
systematically decontaminate while wearing personal
protective equipment.
7. According to Nuclear Regulatory Commission (NRC)
guidelines, what is the maximum allowable limit for
