PET scans MCQs

What is the primary purpose of a PET scan?
- A) Diagnose fractures
- B) Assess metabolic activity
- C) Evaluate blood flow
- D) Measure organ size
Which of the following radiotracers is commonly used in PET scans for cancer detection?
- A) Fluorodeoxyglucose (FDG)
- B) Iodine-123
- C) Technetium-99m
- D) Gallium-68
How does a PET scan differ from a CT scan?
- A) PET scans use X-rays
- B) PET scans assess metabolic processes, while CT scans show anatomy
- C) CT scans require radiotracers
- D) PET scans are less accurate
What type of imaging modality combines PET with CT?
- A) MRI
- B) PET/CT
- C) Ultrasound
- D) SPECT
What condition is often evaluated using FDG-PET scans?
- A) Cancer
- B) Broken bones
- C) Heart disease
- D) Arthritis
In a PET scan, what does the term “radiotracer” refer to?
- A) A type of imaging equipment
- B) A radioactive substance used to visualize metabolic processes
- C) A patient preparation technique
- D) A diagnostic imaging method
Which of the following is a limitation of PET scans?
- A) High sensitivity
- B) Limited resolution compared to CT and MRI
- C) Non-invasive
- D) Ability to assess function
What is the typical preparation for a patient undergoing an FDG-PET scan?
- A) No preparation required
- B) Fasting for 6-12 hours
- C) Hydration is encouraged
- D) Regular meals before the scan
What physiological condition can result in false positives in FDG-PET scans?
- A) Inflammation or infection
- B) Normal tissue
- C) Tumor presence
- D) Reduced blood flow
What is the primary radiation safety concern for patients undergoing PET scans?
- A) Exposure to magnetic fields
- B) Exposure to radioactive tracers
- C) Noise levels
- D) Contrast agent reactions
In which of the following cases would a PET scan be particularly useful?
- A) Staging cancer
- B) Diagnosing fractures
- C) Evaluating joint pain
- D) Routine check-ups
What does the “scan time” refer to in a PET scan?
- A) Time taken to inject the radiotracer
- B) Duration for which the imaging is performed
- C) Total patient preparation time
- D) Time required for image interpretation
How does FDG accumulate in cancerous tissues during a PET scan?
- A) Higher metabolic activity of cancer cells
- B) Decreased blood flow
- C) Reduced oxygen supply
- D) Normal tissue function
What type of imaging is often performed after a PET scan to provide anatomical details?
- A) MRI
- B) CT scan
- C) X-ray
- D) Ultrasound
Which of the following conditions is NOT typically diagnosed using a PET scan?
- A) Alzheimer’s disease
- B) Fractured bones
- C) Lymphoma
- D) Lung cancer
What is the typical half-life of fluorine-18 used in PET imaging?
- A) 2 hours
- B) 6 hours
- C) 110 minutes
- D) 24 hours
What advantage does PET provide in evaluating neurological conditions?
- A) Assessment of brain metabolism
- B) High-resolution imaging
- C) Immediate results
- D) Less radiation exposure
Which of the following statements is true about PET scans?
- A) They are exclusively used for cancer diagnosis
- B) They provide information about metabolic activity
- C) They cannot be combined with other imaging modalities
- D) They are not affected by patient movement
What is the role of a radiopharmaceutical in PET imaging?
- A) Improve image quality
- B) Provide a source of radiation for imaging
- C) Reduce scanning time
- D) Enhance patient comfort
What type of data does a PET scan provide?
- A) Morphological data
- B) Functional and metabolic data
- C) Genetic information
- D) Blood chemistry
Which of the following best describes the resolution of a PET scan?
- A) High resolution
- B) Moderate resolution compared to CT and MRI
- C) Very low resolution
- D) Resolution is not important
What role does a cyclotron play in PET imaging?
- A) It generates X-rays
- B) It produces the radiotracers used in PET scans
- C) It processes the images
- D) It administers the radioactive material
In PET imaging, what does the term “fusion imaging” refer to?
- A) Combining MRI and X-ray
- B) Integrating PET and CT images
- C) Merging ultrasound and CT
- D) None of the above
What is the recommended maximum dose of radiation from a PET scan?
- A) Depends on the radiotracer used and patient factors
- B) 5 mSv
- C) 10 mSv
- D) 20 mSv
Which group of patients may require special consideration when undergoing PET scans?
- A) Adults
- B) Children and pregnant women
- C) Athletes
- D) Healthy individuals
How long does it usually take for a patient to receive the results of a PET scan?
- A) Immediately after the scan
- B) Within a few days
- C) One week
- D) One month
What type of tumors can be evaluated using PET scans?
- A) Benign tumors only
- B) Both benign and malignant tumors
- C) Only aggressive tumors
- D) Tumors of specific organ systems only
What does a high uptake of FDG in a PET scan usually indicate?
- A) Increased metabolic activity, often seen in cancer
- B) Low blood flow
- C) Infection
- D) Healthy tissue
Which of the following is a potential side effect of PET scans?
- A) Radiation exposure
- B) Allergic reactions to the radiotracer
- C) None, they are completely safe
- D) Increased pain at the injection site
In the context of PET imaging, what does the term “SUV” stand for?
- A) Standardized Uniform Value
- B) Standardized Uptake Value
- C) Single Use Vessel
- D) Special Uptake Variance

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