MASSACHUSETTS PET/SPECT TECHNOLOGIST
PRACTICE QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2026 |INSTANT
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1. Which radionuclide is most commonly used in PET imaging?
A. Technetium-99m
B. Iodine-131
C. Fluorine-18
D. Gallium-67
Rationale: PET imaging uses positron-emitting radionuclides;
the most widely used is fluorine-18 because of its ideal half-life
and imaging characteristics.
Correct Answer: C. Fluorine-18
2. What is the approximate half-life of Fluorine-18?
A. 20 minutes
B. 110 minutes
C. 6 hours
D. 24 hours
Rationale: Fluorine-18 has a half-life of about 110 minutes,
making it suitable for clinical PET imaging.
Correct Answer: B. 110 minutes
,3. Which radiopharmaceutical is most commonly used in PET
oncology imaging?
A. Thallium-201
B. FDG
C. MIBI
D. Xenon-133
Rationale: Fluorodeoxyglucose (FDG) labeled with F-18 is
widely used to detect increased glucose metabolism in tumors.
Correct Answer: B. FDG
4. In PET imaging, annihilation produces gamma photons with
what energy?
A. 140 keV
B. 364 keV
C. 511 keV
D. 1022 keV
Rationale: Positron annihilation produces two photons each
with 511 keV energy traveling in opposite directions.
Correct Answer: C. 511 keV
5. Which detector material is commonly used in PET scanners?
,A. Sodium iodide (NaI)
B. BGO
C. Geiger tube
D. Silicon wafer
Rationale: Bismuth germanate (BGO) and other dense
scintillation crystals are commonly used for PET detection.
Correct Answer: B. BGO
6. SPECT imaging primarily detects what type of radiation?
A. Alpha particles
B. Beta particles
C. Gamma rays
D. Neutrons
Rationale: SPECT scanners detect gamma photons emitted
from radiotracers.
Correct Answer: C. Gamma rays
7. The most common radionuclide used in SPECT imaging is:
A. Iodine-131
B. Technetium-99m
C. Fluorine-18
D. Carbon-11
, Rationale: Technetium-99m is widely used because of its
favorable half-life and gamma energy.
Correct Answer: B. Technetium-99m
8. What is the approximate half-life of Technetium-99m?
A. 6 hours
B. 12 hours
C. 24 hours
D. 3 days
Rationale: Tc-99m decays with a half-life of about 6 hours.
Correct Answer: A. 6 hours
9. The gamma photon energy of Tc-99m is approximately:
A. 70 keV
B. 140 keV
C. 250 keV
D. 511 keV
Rationale: Tc-99m emits gamma photons of about 140 keV
ideal for gamma cameras.
Correct Answer: B. 140 keV
10. In SPECT imaging, the device used to detect gamma rays is
called a:
PRACTICE QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2026 |INSTANT
DOWNLOAD PDF
1. Which radionuclide is most commonly used in PET imaging?
A. Technetium-99m
B. Iodine-131
C. Fluorine-18
D. Gallium-67
Rationale: PET imaging uses positron-emitting radionuclides;
the most widely used is fluorine-18 because of its ideal half-life
and imaging characteristics.
Correct Answer: C. Fluorine-18
2. What is the approximate half-life of Fluorine-18?
A. 20 minutes
B. 110 minutes
C. 6 hours
D. 24 hours
Rationale: Fluorine-18 has a half-life of about 110 minutes,
making it suitable for clinical PET imaging.
Correct Answer: B. 110 minutes
,3. Which radiopharmaceutical is most commonly used in PET
oncology imaging?
A. Thallium-201
B. FDG
C. MIBI
D. Xenon-133
Rationale: Fluorodeoxyglucose (FDG) labeled with F-18 is
widely used to detect increased glucose metabolism in tumors.
Correct Answer: B. FDG
4. In PET imaging, annihilation produces gamma photons with
what energy?
A. 140 keV
B. 364 keV
C. 511 keV
D. 1022 keV
Rationale: Positron annihilation produces two photons each
with 511 keV energy traveling in opposite directions.
Correct Answer: C. 511 keV
5. Which detector material is commonly used in PET scanners?
,A. Sodium iodide (NaI)
B. BGO
C. Geiger tube
D. Silicon wafer
Rationale: Bismuth germanate (BGO) and other dense
scintillation crystals are commonly used for PET detection.
Correct Answer: B. BGO
6. SPECT imaging primarily detects what type of radiation?
A. Alpha particles
B. Beta particles
C. Gamma rays
D. Neutrons
Rationale: SPECT scanners detect gamma photons emitted
from radiotracers.
Correct Answer: C. Gamma rays
7. The most common radionuclide used in SPECT imaging is:
A. Iodine-131
B. Technetium-99m
C. Fluorine-18
D. Carbon-11
, Rationale: Technetium-99m is widely used because of its
favorable half-life and gamma energy.
Correct Answer: B. Technetium-99m
8. What is the approximate half-life of Technetium-99m?
A. 6 hours
B. 12 hours
C. 24 hours
D. 3 days
Rationale: Tc-99m decays with a half-life of about 6 hours.
Correct Answer: A. 6 hours
9. The gamma photon energy of Tc-99m is approximately:
A. 70 keV
B. 140 keV
C. 250 keV
D. 511 keV
Rationale: Tc-99m emits gamma photons of about 140 keV
ideal for gamma cameras.
Correct Answer: B. 140 keV
10. In SPECT imaging, the device used to detect gamma rays is
called a:
