Question

Which one of the following is not a characteristic of PET?

• A. Positron emitters
• B. Lead collimators
• C. 511 keV photons
• D. Absolute attenuation correction

Hint:

In PET imaging, positron emitters and 511 keV photons play key roles in generating images, while collimators are not typically used.

Answer 1

The Correct Option is B

- Positron emitters are used in PET scans for detecting positron emission.
- 511 keV photons are generated from the annihilation of positrons, a fundamental characteristic of PET imaging.
- Absolute attenuation correction is used in PET scans to improve image accuracy.
- Lead collimators, however, are more commonly used in other imaging modalities (like X-rays) for controlling the direction of the radiation beam. In PET, detectors rather than collimators are employed.

Conclusion: Lead collimators are not a characteristic of PET imaging, so option (b) is the correct answer.