Stereotactic head frame and computer: what they have in common

1. Step 1. Stereotactic head frame — is part of — Gamma Knife. It holds the head precisely in place.
2. Step 2. Gamma Knife — uses — Radioactivity. Cobalt-60.
3. Step 3. Radioactivity — is used in — PET scanner. A radioactive tracer.
4. Step 4. PET scanner — uses — Computer. Reconstruction.

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