Table 5.
Cases identified as anomalies by Hotelling’s T2 or MSPC’s T2 in the training dataset and their respective reasons
| PET dose (MBq) | DLP (mGy cm) | Weight (kg) | Hoteling T2 | MSPC-T2 | Reason for detection |
|---|---|---|---|---|---|
| 98.3 | 239.11 | 64.9 | 0.000696 | 9.8438 | FDG administration with much lower radiation due to order of delivered radioisotope agents with inadequate radio-activity |
| 77.8 | 1086.28 | 16.3 | 0.002394 | 176.6644 | Application of a fixed higher dose without AEC |
| 26.5 | 174.50 | 4.92 | 0.000938 | 17.2035 | Mistakenly input of DLP value for another patient |
| 150.6 | 98.28 | 448.0 | 0.002835 | 20.1000 | Mistakenly input of body weight |
| 34.2 | 273.34 | 77.9 | 0.001576 | 21.6915 | Unachieved FDG administration at the scheduled time due to the failure to comply dietary restrictions |
| 317.5 | 568.00 | 72.0 | 0.000001 | 18.4427 | Rescanned CT image due to the failure to sustain body posture |
| 350.6 | 672.47 | 91.3 | 0.000003 | 29.8501 | Dose elevation up to approximately twice of the dose at standard examination by dose overadjustment than the adequate noise index |
| 1765 | 233.23 | 44.2 | 0.068416 | 889.3061 | Mistakenly input of dose |
| 309.8 | 565.28 | 84.1 | 0.000002 | 18.3588 | Rescanned CT image due to the failure to sustain body posture |
| 316.8 | 634.74 | 88.5 | 0.000007 | 26.1904 | Rescanned CT image due to the failure to sustain body posture |
| 180.2 | 1103.00 | 40.0 | 0.001178 | 151.2338 | CT examination at higher doses to be used for treatment planning |
| 314.7 | 605.81 | 81.6 | 0.000002 | 22.7373 | Dose elevation up to approximately twice of the dose at standard examination by dose overadjustment than the adequate noise index |
| 86.2 | 232.21 | 40.6 | 0.000663 | 11.0133 | Unachieved FDG administration at the scheduled time due to the failure to comply dietary restrictions |
| 333.9 | 712.89 | 105.0 | 0.000013 | 36.1732 | Dose elevation up to approximately twice of the dose at standard examination by dose overadjustment than the adequate noise index |
| 347.9 | 618.49 | 86.9 | 0.000011 | 23.2538 | Dose elevation up to approximately twice of the dose at standard examination by dose overadjustment than the adequate noise index |
| 253.7 | 604.52 | 75.0 | 0.000125 | 26.4661 | Considerable dose elevation by dose overadjustment than the adequate noise index |
| 343 | 754.04 | 123.4 | 0.000027 | 42.1039 | Considerable dose elevation by dose overadjustment than the adequate noise index |
| 337.4 | 667.02 | 112.5 | 0.000006 | 29.5503 | Considerable dose elevation by dose overadjustment than the adequate noise index |
| 292.8 | 1222.45 | 109.0 | 0.000655 | 162.9579 | Considerable dose elevation by dose overadjustment than the adequate noise index |
| 258.1 | 169.77 | 5556.3 | 0.322500 | 3216.3752 | Mistakenly input of the patient weight |
| 342.1 | 763.39 | 111.7 | 0.000019 | 43.6497 | Dose elevation to obtain alternative CT images due to noise level reduction because of missed conventional CT images prior to FDG-PET examination |
| 363.3 | 707.75 | 100.3 | 0.000004 | 34.3020 | Dose elevation to obtain alternative CT images due to noise level reduction because of missed conventional CT images prior to FDG-PET examination |
| 306.8 | 1585.71 | 72.1 | 0.000881 | 300.6631 | CT examination at higher doses to be used for treatment planning |
| 243.7 | 529.51 | 66.4 | 0.000098 | 18.2217 | Rescanned CT image due to the failure to sustain body posture |
| 274 | 569.36 | 69.5 | 0.000038 | 20.5959 | Rescanned CT image due to the failure to sustain body posture |
| 263.7 | 556.69 | 65.8 | 0.000051 | 19.8249 | Considerable dose elevation by dose overadjustment than the adequate noise noise index |
| 307.3 | 837.40 | 89.2 | 0.000102 | 59.7736 | Rescanned CT image due to the failure to sustain body posture |
| 236.7 | 706.45 | 57.2 | 0.000230 | 43.7964 | Rescanned CT image due to the failure to sustain body posture |