2. In PET imaging, the radiotracer used is typically: a) A positron-emitting isotope b) A gamma-ray emitting isotope c) An X-ray absorbing material d) A magnetic resonance contrast agent Answer: a) A positron-emitting isotope
3. SPECT imaging provides information about: a) The distribution of gamma-emitting tracers in the body b) The distribution of positron-emitting tracers in the body c) The anatomical structure of tissues d) The magnetic properties of tissues Answer: a) The distribution of gamma-emitting tracers in the body
4. PET imaging is particularly useful for: a) Evaluating metabolic activity and function b) Imaging bone structure c) Assessing tissue density d) Analyzing blood flow Answer: a) Evaluating metabolic activity and function
5. The main advantage of PET over SPECT is: a) Higher spatial resolution b) Higher sensitivity to gamma rays c) Lower radiation dose d) Better tissue contrast Answer: a) Higher spatial resolution
6. SPECT scanners typically use: a) Rotating gamma cameras b) Rotating X-ray tubes c) Static magnetic fields d) Positron detectors Answer: a) Rotating gamma cameras
7. In PET imaging, the annihilation photons are: a) Detected by coincidence detection b) Detected by single photon emission c) Absorbed by the detector d) Reflected by the detector Answer: a) Detected by coincidence detection
8. A common radiotracer used in PET scans is: a) Fluorodeoxyglucose (FDG) b) Technetium-99m c) Iodine-123 d) Gallium-67 Answer: a) Fluorodeoxyglucose (FDG)
9. The spatial resolution of PET scans is generally: a) Higher than SPECT b) Lower than SPECT c) Equivalent to SPECT d) Unrelated to SPECT Answer: a) Higher than SPECT
10. The main component of a SPECT scanner is: a) Gamma camera b) PET detector ring c) MRI coil d) CT scanner Answer: a) Gamma camera
11. The main source of radiation in PET imaging is: a) Positron-emitting radiotracer b) Gamma-ray emitting radiotracer c) X-ray tube d) MRI magnet Answer: a) Positron-emitting radiotracer
12. The principle of attenuation correction in PET scans involves: a) Adjusting for tissue density variations b) Filtering out background noise c) Correcting for patient movement d) Enhancing signal-to-noise ratio Answer: a) Adjusting for tissue density variations
13. The SPECT scan acquires images: a) By detecting gamma rays emitted from multiple angles b) By detecting positrons emitted from a single angle c) By measuring tissue density d) By analyzing magnetic resonance signals Answer: a) By detecting gamma rays emitted from multiple angles
14. PET imaging is often used in oncology to: a) Identify cancerous lesions and assess their activity b) Determine bone density c) Evaluate heart function d) Measure brain activity Answer: a) Identify cancerous lesions and assess their activity
15. The main advantage of using Technetium-99m in SPECT is: a) Its ideal half-life and gamma emission characteristics b) Its positron emission properties c) Its high cost and short half-life d) Its strong magnetic properties Answer: a) Its ideal half-life and gamma emission characteristics
16. In PET scans, the radiotracer commonly used for brain imaging is: a) Fluorodeoxyglucose (FDG) b) Technetium-99m c) Iodine-123 d) Gallium-67 Answer: a) Fluorodeoxyglucose (FDG)
17. The “collimator” in SPECT imaging is used to: a) Restrict the direction of incoming gamma rays b) Detect positron emission c) Create high-resolution images d) Measure magnetic fields Answer: a) Restrict the direction of incoming gamma rays
18. PET scans are able to detect: a) Metabolic changes at a cellular level b) Bone fractures and density c) Muscle tissue abnormalities d) Electrical activity of the heart Answer: a) Metabolic changes at a cellular level
19. The main limitation of SPECT imaging compared to PET is: a) Lower spatial resolution b) Higher radiation dose c) Limited availability of radiotracers d) Poorer tissue contrast Answer: a) Lower spatial resolution
20. The basic concept of PET involves: a) Detection of coincident annihilation photons b) Measurement of gamma rays from a single source c) Detection of X-rays passing through the body d) Analysis of magnetic resonance signals Answer: a) Detection of coincident annihilation photons
21. The primary use of PET imaging is to assess: a) Metabolic activity and function of organs b) Bone structure and density c) Tissue damage from trauma d) Anatomical changes in the body Answer: a) Metabolic activity and function of organs
22. SPECT imaging is used to evaluate: a) Cardiac perfusion b) Bone density c) Brain activity d) Liver function Answer: a) Cardiac perfusion
23. In PET imaging, the resolution is improved by: a) Using detectors in a ring configuration b) Increasing the gamma ray emission c) Using a single detector d) Reducing the positron emission Answer: a) Using detectors in a ring configuration
24. The main detector used in PET scanners is: a) Scintillation crystal coupled with photomultiplier tubes b) Gamma camera c) X-ray tube d) MRI coil Answer: a) Scintillation crystal coupled with photomultiplier tubes
25. The primary benefit of using PET for oncology is: a) Ability to measure metabolic activity and detect small lesions b) High resolution of bone images c) Low radiation dose d) Excellent for imaging soft tissues Answer: a) Ability to measure metabolic activity and detect small lesions
26. SPECT imaging can be used to evaluate: a) Brain perfusion b) Bone marrow function c) Gastrointestinal bleeding d) All of the above Answer: d) All of the above
27. The principle of attenuation correction in SPECT imaging involves: a) Adjusting for tissue absorption of gamma rays b) Filtering background radiation c) Enhancing image resolution d) Correcting for patient movement Answer: a) Adjusting for tissue absorption of gamma rays
28. The “photopeak” in SPECT imaging refers to: a) The energy level of gamma rays detected from the radiotracer b) The highest resolution achieved c) The timing of photon detection d) The energy of positrons emitted Answer: a) The energy level of gamma rays detected from the radiotracer
29. The main limitation of PET imaging is: a) High cost of equipment and radiotracers b) Low spatial resolution c) High radiation dose d) Poor tissue contrast Answer: a) High cost of equipment and radiotracers
30. The radioisotope used in PET imaging for cardiac studies is: a) Fluorodeoxyglucose (FDG) b) Technetium-99m c) Iodine-123 d) Gallium-67 Answer: a) Fluorodeoxyglucose (FDG)
31. The main advantage of SPECT over conventional gamma imaging is: a) Three-dimensional imaging capability b) Higher resolution c) Lower radiation dose d) Better tissue contrast Answer: a) Three-dimensional imaging capability
32. In PET scans, the process of “coincidence detection” involves: a) Detecting two photons emitted simultaneously from annihilation events b) Measuring single photon emissions c) Filtering out background radiation d) Detecting magnetic resonance signals Answer: a) Detecting two photons emitted simultaneously from annihilation events
33. The “scintillation crystal” in PET scanners is used to: a) Convert positron annihilation photons into visible light b) Detect gamma rays c) Measure X-ray attenuation d) Enhance magnetic resonance signals Answer: a) Convert positron annihilation photons into visible light
34. SPECT imaging is commonly used for: a) Evaluating myocardial perfusion b) Assessing brain function c) Detecting metabolic disorders d) Analyzing tissue contrast Answer: a) Evaluating myocardial perfusion
35. The primary method of image reconstruction in PET involves: a) Iterative algorithms b) Fourier transforms c) X-ray attenuation maps d) Magnetic resonance imaging Answer: a) Iterative algorithms
36. The key advantage of using Technetium-99m in SPECT is: a) Its ideal physical characteristics for imaging b) Its positron emission properties c) Its use in MRI scans d) Its high cost and short half-life Answer: a) Its ideal physical characteristics for imaging
37. In PET scans, the radiotracer is injected into the patient to: a) Accumulate in specific tissues based on metabolic activity b) Block specific tissue signals c) Enhance bone density d) Measure electrical activity Answer: a) Accumulate in specific tissues based on metabolic activity
38. The primary limitation of SPECT imaging is: a) Lower spatial resolution compared to PET b) High cost c) Limited availability d) Poor contrast resolution Answer: a) Lower spatial resolution compared to PET
39. PET scans can be used to: a) Detect early signs of cancer b) Assess bone fractures c) Measure muscle mass d) Evaluate tissue density Answer: a) Detect early signs of cancer
40. The radiotracer used in SPECT for thyroid imaging is: a) Technetium-99m pertechnetate b) Fluorodeoxyglucose (FDG) c) Iodine-123 d) Gallium-67 Answer: a) Technetium-99m pertechnetate
41. In PET imaging, the spatial resolution is improved by: a) Using multiple detectors in a ring b) Increasing the dose of radiotracer c) Reducing the number of photons detected d) Increasing the thickness of the scintillation crystals Answer: a) Using multiple detectors in a ring
42. The primary advantage of PET scans in oncology is: a) High sensitivity to detect small and early-stage tumors b) High spatial resolution for bone imaging c) Low radiation dose compared to CT d) High contrast for soft tissues Answer: a) High sensitivity to detect small and early-stage tumors
43. In SPECT imaging, the “collimator” is designed to: a) Filter gamma rays to reduce scatter b) Enhance the positron signal c) Measure X-ray attenuation d) Improve magnetic resonance signals Answer: a) Filter gamma rays to reduce scatter
44. The term “attenuation correction” in PET imaging refers to: a) Adjusting for the loss of photons due to tissue absorption b) Enhancing the image contrast c) Correcting for background noise d) Measuring the patient’s movement Answer: a) Adjusting for the loss of photons due to tissue absorption
45. The principle of “tomography” in PET imaging involves: a) Creating cross-sectional images of the body b) Measuring the magnetic properties of tissues c) Analyzing the density of bones d) Detecting single photons Answer: a) Creating cross-sectional images of the body
46. SPECT imaging is often used in: a) Cardiology to assess myocardial perfusion b) Oncology for detecting tumors c) Neurology for evaluating brain function d) All of the above Answer: d) All of the above
47. The primary application of SPECT imaging in neurology is to: a) Assess cerebral blood flow and function b) Evaluate bone density c) Measure muscle activity d) Detect early cancer signs Answer: a) Assess cerebral blood flow and function
48. The “scintillation detector” in PET imaging is used to: a) Convert photon energy into visible light b) Measure magnetic fields c) Detect X-ray attenuation d) Analyze tissue density Answer: a) Convert photon energy into visible light
49. The main purpose of using attenuation correction in PET scans is to: a) Improve image quality and accuracy b) Reduce radiation dose c) Enhance bone imaging d) Measure muscle density Answer: a) Improve image quality and accuracy
50. The “detection ring” in PET scanners is used to: a) Detect annihilation photons from various angles b) Filter gamma rays from a single source c) Measure magnetic resonance signals d) Analyze X-ray attenuation Answer: a) Detect annihilation photons from various angles
- Radiographic Imaging Techniques MCQs Radiology
- Radiation Physics MCQs Radiology
- Radiation Protection MCQs Radiology
- Anatomy and Radiology MCQs Radiology
- Contrast Agents MCQs Radiology
- Interventional Radiology MCQs Radiology
- Radiologic Pathology MCQs Radiology
- Nuclear Medicine MCQs Radiology
- Radiobiology MCQs Radiology
- Pediatric Radiology MCQs Radiology
- Emergency Radiology MCQs Radiology