| Abbreviation | Definition |
|---|---|
| PPBS | Posterior Pituitary Bright Spot |
| PPD/NOS | Pervasive developmental disorder, not otherwise specified |
| PRK | Photo Refractive Keratectomy |
| PRMS | Post Retirement Medical Scheme |
| PSDL | Primary Standards Dosimetry Laboratory |
| PSF | Peak-Scatter Factor |
| RDF | Relative Dose Factor |
| REF | Relative Exposure Factor |
| REV | Room's Eye View |
| RF | Radio Frequency |
| RFA | Radiation Field Analyser |
| RGS | Respiratory Gated System |
| RL | Radio-Luminescence |
| RPC | Radiological Physics Center |
| RPL | RadioPhotoLuminescence |
| RPO | Radiation Protection Officer |
| RSL | Radioactive Seed Localization |
| RTA | Retinal Thickness Analysis |
| RTBM | Real-Time Brain Mapping |
| RTCI | Real-Time Compound Imaging |