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This project uses multimodal neuroimaging data from the PPMI database, combining DaTSCAN SPECT and T2-weighted sMRI, and adopts ResNet and EfficientNet architectures to achieve accurate detection of Parkinson's disease. The multimodal fusion model achieves an AUROC of 99%, significantly outperforming unimodal baseline methods, providing an effective solution for AI-assisted diagnosis of neurological diseases.
Section 01
This study uses multimodal neuroimaging data (DaTSCAN SPECT and T2-weighted sMRI) from the PPMI database, and combines ResNet and EfficientNet architectures to build a fusion model for accurate detection of Parkinson's disease. The model achieves an AUROC of 99%, significantly outperforming unimodal baselines, and provides an effective solution for AI-assisted diagnosis of neurological diseases.
Section 02
Parkinson's disease is the second most common neurodegenerative disease globally. Early diagnosis relies on clinical observation and subjective symptoms, which often leads to missed intervention opportunities. Neuroimaging brings hope for early detection, but a single modality only reflects partial pathological features. DaTSCAN SPECT can visualize the function of dopaminergic neurons, while sMRI shows anatomical structure changes. The two are complementary, but using them alone is difficult to achieve high sensitivity and specificity in diagnosis.
Section 03
Data Modalities: Integrate DaTSCAN SPECT (functional, reduced tracer uptake in the striatum) and T2-weighted sMRI (structural, such as reduced volume of the substantia nigra pars compacta). Fusion Architecture: Late fusion strategy—1. Use ResNet-50 (residual connections to alleviate gradient vanishing) and EfficientNet-B3 (compound scaling to balance efficiency) to extract features respectively; 2. Unify dimensions through fully connected layers, then concatenate or fuse with attention weighting; 3. Input to the classifier to output the probability of disease. Attention Mechanism: Channel attention (learn feature channel weights) + spatial attention (focus on key brain regions like the striatum and substantia nigra).
Section 04
Dataset: Based on the PPMI database (one of the world's largest longitudinal studies on Parkinson's disease). Cross-validation: 5-fold cross-validation, ensuring that samples from the same patient do not cross training/test sets to avoid data leakage. Results: The performance of the multimodal fusion model is significantly better than unimodal models:
| Model Configuration | AUROC | Accuracy | Sensitivity | Specificity |
|---|---|---|---|---|
| Only DaTSCAN | 94.2% | 89.5% | 87.3% | 91.4% |
| Only sMRI | 82.1% | 78.6% | 75.2% | 81.8% |
| Multimodal Fusion | 99.0% | 96.8% | 95.7% | 97.6% |
Section 05
Innovations: 1. Complementary use of modal characteristics (SPECT is sensitive to early functional impairment, sMRI provides anatomical localization); 2. Data augmentation (spatial transformation, intensity adjustment, noise injection) to address limited data volume; 3. Grad-CAM visualization of decision-making basis, focusing on lesion brain regions to enhance clinical trust.
Section 06
Applications: 1. Early screening of high-risk populations; 2. Assisting differential diagnosis of atypical patients; 3. Efficacy monitoring and prognosis evaluation. Limitations: The dataset is mainly composed of Western populations, so generalization needs to be verified; cross-sectional design cannot capture dynamic evolution; lack of deep association with clinical scales. Future Directions: Build multi-center diverse datasets; introduce temporal modeling; develop lightweight models; explore fusion with cerebrospinal fluid biomarkers.
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