Agreement of Characteristics on PET and CT with the Standard of Reference
| Modality | Characteristic | Time of imaging after therapy (mo) | κ value | P value of κ |
|---|---|---|---|---|
| CT | HU | 1 | 0.727 | 0.001 |
| 3 | 0.783 | 0.011 | ||
| 6 | 1.0 | 0.008 | ||
| PET | No. of lesions | 1 | 0.828 | <0.001 |
| 3 | 1.0 | 0.001 | ||
| 6 | 1.0 | 0.005 | ||
| PET | Lesion size | 1 | 0.828 | <0.001 |
| 3 | 1.0 | 0.001 | ||
| 6 | 1.0 | 0.005 | ||
| PET | SUV | 1 | 0.348 | 0.04 |
| 3 | 0.744 | 0.011 | ||
| 6 | 1.0 | 0.005 |
Characteristics on CT and PET evaluation and their agreement with the standard of reference when assessed separately for tumor response to imatinib. Statistical significance of the agreement between the different imaging procedures and the standard of reference were demonstrated with P values. P < 0.05 was considered to be statistically significant.