It seems like you might be asking about "photon exams," but that's not a common term in the medical field.

It's possible you're thinking of:

* "Photon emission tomography" (PET scans): These are imaging tests that use radioactive tracers to create 3D images of organs and tissues. They're used to detect diseases like cancer and heart problems.

* "X-ray imaging": These use photons of electromagnetic radiation to create images of bones and other dense structures.

If you can provide more context about what you're looking for, I can give you a more accurate answer. For example, are you looking for information about:

* How photons are used in medical imaging?

* What types of medical exams use photons?

* The risks and benefits of different photon-based exams?

Please let me know!