Table 4.
CT and MR image classification sensitivity and specificity by body region. n = number of images
| CT | MRI | |||||||
|---|---|---|---|---|---|---|---|---|
| Body Region | n | F1 (95% CI) | Sensitivity (95% CI) | Specificity (95% CI) | n | F1 (95% CI) | Sensitivity (95% CI) | Specificity (95% CI) |
| Overall | 262,326 | 92.5 (92.2–92.8) | 92.5 (92.1–92.8) | 99.4 (99.4–99.5) | 118,829 | 92.2 (91.9–92.5) | 92.3 (92.0–92.5) | 99.2 (99.1–99.2) |
| Abdomen | 22,302 | 96.2 (93.1–98.6) | 96.7 (96.1–97.3) | 98.7 (98.6–98.8) | 17,517 | 90.1 (89.6–90.6) | 92.4 (91.7–93.0) | 97.5 (97.3–97.6) |
| Arm | 14,430 | 93.9 (89.1–97.5) | 94.1 (92.9–95.3) | 99.2 (99.1–99.3) | 3815 | 91.6 (90.5–92.7) | 88.8 (87.1–90.5) | 99.8 (99.8–99.8) |
| Breast | - | - | - | - | 20,501 | 100.0 (100.0–100.0) | 100.0 (100.0–100.0) | 100.0 (100.0–100.0) |
| Calf | 12,308 | 94.7 (91.9–97.0) | 93.0 (91.7–94.3) | 99.7 (99.6–99.7) | 3299 | 93.2 (92.2–94.3) | 95.7 (94.5–96.9) | 99.6 (99.6–99.7) |
| Chest | 27,968 | 96.4 (93.5–98.7) | 96.9 (96.3–97.6) | 98.9 (98.8–99.0) | 13,010 | 89.6 (88.9–90.2) | 89.2 (88.4–90.1) | 98.5 (98.4–98.7) |
| Cervical spine | 11,993 | 87.1 (85.4–88.8) | 78.0 (76.0–80.0) | 99.9 (99.9–99.9) | 3607 | 75.0 (72.6–77.5) | 62.3 (59.3–65.5) | 99.9 (99.9–99.9) |
| Elbow | 11,288 | 91.6 (87.5–94.6) | 88.0 (86.0–90.0) | 99.6 (99.6–99.7) | 4615 | 91.8 (90.7–92.9) | 91.2 (89.6–92.7) | 99.7 (99.6–99.7) |
| Foot | 13,137 | 92.0 (90.2–93.6) | 86.5 (84.8–88.2) | 99.9 (99.8–99.9) | 3178 | 95.3 (94.2–96.4) | 94.8 (93.3–96.4) | 99.9 (99.9–99.9) |
| Forearm | 8232 | 89.3 (83.9–93.8) | 86.6 (84.3–88.8) | 99.5 (99.5–99.6) | 3546 | 88.8 (87.4–90.1) | 86.0 (84.1–87.9) | 99.7 (99.7–99.8) |
| Hand | 11,321 | 95.0 (91.4–97.9) | 94.9 (93.7–96.2) | 99.6 (99.5–99.6) | 6699 | 95.9 (95.2–96.6) | 96.3 (95.4–97.3) | 99.8 (99.7–99.8) |
| Head | 29,066 | 99.1 (98.7–99.5) | 98.7 (98.3–99.1) | 99.9 (99.9–99.9) | 7633 | 97.3 (96.7–97.9) | 99.3 (98.8–99.7) | 99.7 (99.7–99.8) |
| Knee | 10,721 | 93.7 (89.0–97.5) | 94.0 (92.7–95.3) | 99.4 (99.3–99.4) | 3649 | 95.2 (94.3–96.2) | 95.8 (94.5–97.0) | 99.8 (99.8–99.9) |
| Lumbar spine | 16,100 | 95.9 (94.4–97.2) | 93.6 (92.4–94.8) | 99.8 (99.8–99.9) | 4556 | 96.5 (95.7–97.2) | 97.0 (96.0–98.0) | 98.8 (99.8–99.9) |
| Neck | 19,292 | 93.4 (88.1–97.6) | 94.4 (93.3–95.5) | 98.9 (98.8–99.0) | 4363 | 77.5 (75.5–79.3) | 86.1 (83.7–88.6) | 98.9 (98.8–99.0) |
| Pelvis | 13,886 | 90.9 (89.0–92.6) | 84.9 (83.2–86.6) | 99.8 (99.7–99.8) | 11,632 | 92.3 (91.6–92.9) | 90.3 (89.4–91.3) | 99.4 (99.3–99.5) |
| Shoulder | 13,266 | 92.7 (90.3–94.7) | 88.6 (86.9–90.2) | 99.8 (99.7–99.8) | 5599 | 95.4 (94.7–96.2) | 98.6 (98.0–99.2) | 99.6 (99.6–99.7) |
| Thigh | 14,409 | 94.0 (92.8–95.1) | 89.4 (88.0–90.8) | 99.9 (99.9–99.9) | 4485 | 93.4 (92.4–94.3) | 88.9 (87.3–90.5) | 99.9 (99.9–100.0) |
| Thoracic spine | 21,378 | 94.4 (92.5–96.0) | 91.4 (90.3–92.5) | 99.5 (99.5–99.6) | 3952 | 93.0 (91.9–94.1) | 93.4 (91.9–94.8) | 99.7 (99.7–99.8) |