Table 1.
Hepatic nodule classification using K-means method
| K = 4 | I | II | III | IV | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HCC | 4 | 10 | 3 | 0 | ||||||||
| DN | 0 | 2 | 2 | 0 | ||||||||
| RN | 0 | 3 | 4 | 0 | ||||||||
| Cyst | 0 | 0 | 0 | 5 | ||||||||
| K = 5 | I | II | III | IV | V | → | I | II | III’ | IV | ||
| HCC | 4 | 7 | 2 | 4 | 0 | HCC | 4 | 7 | 6 | 0 | ||
| DN | 0 | 2 | 1 | 1 | 0 | DN | 0 | 2 | 2 | 0 | ||
| RN | 0 | 3 | 2 | 2 | 0 | RN | 0 | 3 | 4 | 0 | ||
| Cyst | 0 | 0 | 0 | 0 | 5 | Cyst | 0 | 0 | 0 | 5 | ||
| K = 6 | I | II | III | IV | V | VI | → | I | II | III’ | IV | |
| HCC | 3 | 9 | 1 | 2 | 2 | 0 | HCC | 3 | 9 | 5 | 0 | |
| DN | 0 | 0 | 2 | 1 | 1 | 0 | DN | 0 | 0 | 4 | 0 | |
| RN | 0 | 2 | 1 | 2 | 2 | 0 | RN | 0 | 2 | 5 | 0 | |
| Cyst | 0 | 0 | 0 | 0 | 0 | 5 | Cyst | 0 | 0 | 0 | 5 | |
The classified number of each type of hepatic nodules (HCC, DN, RN and cyst) using the multi-dimensional KM classification method (k = 4, 5, 6). For k =5 and k = 6, overlapping classes (gray columns) were combined in a new class (III’). Nodule types were determined at histopathology as a reference standard.