1. What is the primary purpose of nuclear medicine in clinical practice?
A) Diagnosis and therapy
B) Only therapy
C) Only research
D) Only diagnosis
Answer: A
Explanation: Nuclear medicine plays a dual role by providing both diagnostic imaging and
therapeutic interventions in various diseases.
2. Which type of radiation is most commonly used in diagnostic nuclear medicine?
A) Alpha radiation
B) Beta radiation
C) Gamma radiation
D) Neutron radiation
Answer: C
Explanation: Gamma radiation is primarily used in diagnostic imaging because it can be detected
externally with gamma cameras.
3. What unit is used to measure the activity of a radionuclide?
A) Gray
B) Sievert
C) Becquerel
D) Watt
Answer: C
Explanation: The Becquerel (Bq) is the SI unit for measuring the activity of a radionuclide,
representing one disintegration per second.
4. Which phenomenon describes the reduction in intensity of radiation as it passes through
matter?
A) Reflection
B) Attenuation
C) Diffraction
D) Refraction
Answer: B
Explanation: Attenuation is the process by which the intensity of radiation is reduced due to
absorption and scattering in matter.
5. What is the significance of the half-life of a radionuclide in nuclear medicine?
A) It determines the isotope’s stability
B) It indicates the time for half the atoms to decay
C) It measures radiation penetration
D) It quantifies the isotope’s weight
,Answer: B
Explanation: The half-life is the period required for half of the radioactive atoms in a sample to
decay, influencing both imaging quality and patient radiation dose.
6. What device is essential for detecting gamma radiation in nuclear medicine imaging?
A) MRI scanner
B) Gamma camera
C) X-ray machine
D) Ultrasound device
Answer: B
Explanation: A gamma camera detects gamma radiation emitted by radiopharmaceuticals,
allowing image formation in nuclear medicine.
7. Which component of a gamma camera converts gamma rays into light photons?
A) Collimator
B) Scintillation crystal
C) Photomultiplier tube
D) Digital processor
Answer: B
Explanation: The scintillation crystal converts incoming gamma rays into light, which is then
amplified by photomultiplier tubes.
8. What is the primary role of a collimator in nuclear medicine imaging?
A) Amplify light signals
B) Convert radiation to electrical signals
C) Restrict the direction of incoming gamma rays
D) Enhance image contrast
Answer: C
Explanation: The collimator ensures that only gamma rays traveling in specific directions reach
the detector, thereby improving image resolution.
9. What is one key advantage of PET imaging over conventional imaging techniques?
A) Higher spatial resolution
B) Superior functional imaging capability
C) Lower cost
D) No need for radiopharmaceuticals
Answer: B
Explanation: PET imaging provides superior functional and metabolic information compared to
many conventional imaging techniques.
10. Which of the following is a common radionuclide used in myocardial perfusion
imaging?
A) I-131
B) Tc-99m
C) F-18
D) Ga-68
,Answer: B
Explanation: Technetium-99m (Tc-99m) is widely used in myocardial perfusion imaging due to
its favorable physical characteristics and optimal imaging properties.
11. What principle is fundamental to radiation protection in nuclear medicine?
A) Time, distance, and shielding
B) Energy, frequency, and wavelength
C) Dose, rate, and accumulation
D) Speed, intensity, and direction
Answer: A
Explanation: The basic principles of radiation protection include minimizing exposure time,
maximizing distance, and using appropriate shielding.
12. Which agency is responsible for regulating the use of radioactive materials in the
United States?
A) FDA
B) EPA
C) NRC
D) CDC
Answer: C
Explanation: The Nuclear Regulatory Commission (NRC) is responsible for overseeing the safe
use of radioactive materials in the U.S.
13. In radiopharmaceutical production, which device is used to accelerate charged
particles?
A) Cyclotron
B) Reactor
C) Generator
D) Incubator
Answer: A
Explanation: Cyclotrons accelerate charged particles to produce radionuclides used in PET
imaging and other nuclear medicine applications.
14. Which imaging modality integrates metabolic imaging with anatomical imaging?
A) SPECT only
B) PET/CT
C) Ultrasound
D) X-ray fluoroscopy
Answer: B
Explanation: PET/CT combines metabolic imaging from PET with the anatomical detail from
CT, providing comprehensive diagnostic information.
15. What is the main function of dosimeters in nuclear medicine?
A) To measure image resolution
B) To quantify radiation exposure
C) To calibrate imaging devices
, D) To produce radiopharmaceuticals
Answer: B
Explanation: Dosimeters are used to measure the radiation dose received by patients and
healthcare workers, ensuring safe exposure levels.
16. Which factor is most critical when performing routine maintenance of nuclear medicine
equipment?
A) Upgrading software versions
B) Calibration and quality assurance
C) Increasing patient throughput
D) Reducing image contrast
Answer: B
Explanation: Routine calibration and quality assurance are essential for maintaining accurate and
reliable imaging results.
17. What property of a radiopharmaceutical primarily determines its biological
distribution?
A) Physical half-life
B) Chemical form
C) Emission type
D) Production method
Answer: B
Explanation: The chemical form of a radiopharmaceutical affects its biological behavior,
including uptake and clearance in tissues.
18. Which radiopharmaceutical is commonly used for thyroid imaging?
A) F-18 FDG
B) Tc-99m pertechnetate
C) I-131
D) Ga-68
Answer: C
Explanation: Iodine-131 (I-131) is used for both imaging and therapy in thyroid disorders due to
its uptake by thyroid tissue.
19. In radiopharmaceutical preparation, what is the primary reason for ensuring
radiochemical purity?
A) To reduce cost
B) To ensure effective imaging and reduce side effects
C) To enhance patient comfort
D) To simplify dosage calculations
Answer: B
Explanation: High radiochemical purity ensures that the radiopharmaceutical will target the
intended tissue effectively and minimizes the risk of adverse reactions.
20. Which method is used for calculating the appropriate radiopharmaceutical dose for a
patient?