| 3D | Three-dimensional |
| FE | Finite element |
| ML | Machine learning |
| BP-ANNs | Backpropagation artificial neural networks |
| BMI | Body-mass index |
| LBN | Nipple of the left breast |
| NPSN | Mid suprasternal notch |
| RBN | Nipple of the right breast |
| UP | Uppermost |
| OUT | Outmost |
| IN | Innermost |
| MID | Middle point |
| MOBP | Momentum backpropagation |
| VLN | Variable learning rate |
| RPROP | Resilient back propagation |
| CGBP | Conjugate and gradient backpropagation |
| MSE | Mean square error |
| MAPE | Mean absolute percentage error |
| PSO | Particle swarm optimization |
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