| CRC | Contrast recovery coefficient |
| DL | Deep learning |
| FOV | Field of view |
| HR | High-resolution |
| KEM | Kernelized expectation maximization |
| LR | Low-resolution |
| MLEM | Maximum Likelihood Expectation Maximization |
| ROI | Region of interest |
| TV | Total variation |
| SPECT | Single photon emission computed tomography |
| SR | Super-resolution |
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