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| Radiation Dosage (2) | radiation measurements (1) | Radiation Protection (1) |
| Radiation Protection: methods (1) | Radiographic Image Enhancement (1) | Radiographic Image Enhancement: methods (1) |
| Radiometry (1) | Radiometry: methods (1) | Radiotherapy (2) |
| Radiotherapy Dosage (1) | Radiotherapy Planning (1) | Rats (2) |
| Rats, Sprague-Dawley (1) | reconstruction time (1) | Rectum (1) |
| Rectum: anatomy & histology (1) | Rectum: radiography (1) | Regularization (1) |
| Renal system (1) | Reproducibility of Results (1) | research and development (1) |
| Research Article (1) | Respiration (1) | Rotation (1) |
| Running (1) | | |
