Dataset004_PICAI
Task: Multi-class prostate segmentation (prostate gland + tumor) on prostate MRI (T2W, ADC, HBV) + ISUP grade classification (6-class: 0=Benign/Indolent, 1–5=ISUP grades)
Per-Fold Results — Segmentation
| Fold | DSC (prostate) | NSD (prostate) | DSC (tumor) | NSD (tumor) | DSC mean | NSD mean |
|---|---|---|---|---|---|---|
| 0 | 0.960 | 0.959 | 0.473 | 0.490 | 0.717 | 0.724 |
| 1 | 0.960 | 0.960 | 0.536 | 0.552 | 0.748 | 0.756 |
| 2 | 0.959 | 0.959 | 0.634 | 0.649 | 0.797 | 0.804 |
| 3 | 0.947 | 0.939 | 0.168 | 0.188 | 0.558 | 0.564 |
| 4 | 0.960 | 0.960 | 0.557 | 0.575 | 0.759 | 0.767 |
| Mean | 0.957 | 0.955 | 0.474 | 0.491 | 0.716 | 0.723 |
| Std | 0.006 | 0.009 | 0.180 | 0.179 | 0.093 | 0.094 |
Per-Fold Results — Classification
| Fold | AUROC | AUPRC | Bal Acc | F1 |
|---|---|---|---|---|
| 0 | 0.731 | 0.290 | 0.240 | 0.236 |
| 1 | 0.720 | 0.281 | 0.212 | 0.183 |
| 2 | 0.746 | 0.300 | 0.240 | 0.229 |
| 3 | 0.702 | 0.310 | 0.176 | 0.063 |
| 4 | 0.736 | 0.350 | 0.263 | 0.224 |
| Mean | 0.727 | 0.306 | 0.226 | 0.187 |
| Std | 0.017 | 0.027 | 0.033 | 0.072 |
Notes:
- Prostate gland segmentation is strong and consistent (DSC 0.957 ± 0.006); the gland is a well-defined, large structure
- Tumor segmentation is challenging (DSC 0.474 ± 0.180): 71% of cases (1075/1500) have no tumor, so many folds see near-zero tumor Dice dominated by true-negatives
- Fold 3 has noticeably lower tumor DSC (0.168) and NSD (0.188), likely due to an unfavorable fold split or harder cases
- Classification: AUROC 0.727 is reasonable for 6-class ISUP grading; Bal Acc (0.226) and F1 (0.187) are near the random baseline (1/6 ≈ 0.167), driven by severe class imbalance (847/1500 cases are grade 0)
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