Table 1.
Characteristics of the datasets analyzed within the present study
| EORTC‐26101 | LPBA40 | NFBS | CC‐359 | ||
|---|---|---|---|---|---|
| Training set | Test set | ||||
| Patients (n) | 372 | 211 | 40 | 125 | 359 |
| MRI exams (n) | 1,568 | 833 | 40 | 125 | 359 |
| MRI exams per patient (median, IQR) | 4 (3–6) | 4 (3–6) | 1 | 1 | 1 |
| Institutes (n) | 25 | 12 | 1 | 1 | 2 |
| Patients per institute (median, IQR) | 7 (4–15) | 11 (3–20) | 1 | 1 | 60/299 |
| MRI sequence (n)* | |||||
| T1‐w | 1,568 | 833 | 40 | 125 | 359 |
| cT1‐w | 1,623 | 898 | – | – | – |
| FLAIR | 1,940 | 895 | – | – | – |
| T2‐w | 1,455 | 793 | – | – | – |
| MR vendors (n) | |||||
| Siemens | 535 | 395 | – | 125 | 120 |
| Philips | 350 | 157 | – | – | 119 |
| General electric | 640 | 267 | 40 | – | 120 |
| Toshiba | 12 | – | – | – | – |
| Unknown | 31 | 14 | – | – | – |
| MR field strength (n) | |||||
| 1.0 T | – | 9 | –– | – | – |
| 1.5 T | 631 | 78 | 40 | – | 179 |
| 3.0 T | 216 | 317 | – | 125 | 180 |
| 1.5 or 3 T | 619 | 415 | – | – | – |
| Unknown | 104 | 14 | – | – | – |
Abbreviations: IQR, interquartile range; LPBA40, LONI Probabilistic Brain Atlas; MRI, magnetic resonance imaging; NFBS, Nathan Kline Institute Enhanced Rockland Sample Neurofeedback Study; CC‐359, Calgary‐Campinas‐359.
*
higher number of MRI sequences (as compared to total number of MRI exams) due to inclusion of both 2D and 3D acquisition (if available).