Mean values of computed tomographic (CT) attenuation, apparent diffusion coefficient (ADC), diffusion-weighted MR imaging (DWI)*
| Initial CT and MRI | Follow-up MRI at day 1 | ||||
|---|---|---|---|---|---|
| RD Lesion (ROIRD) | DWI Lesion 1 (ROIDWII) | DWI Lesion 2 (ROIDW12) | RD Lesion (ROIRD) | Whole DWI Lesion (ROIDW) | |
| ΔHU | 2.33 ± 0.74 | 2.90 ± 1.34 | 0.18 ± 0.28 | — | — |
| ADC (10−6 mm2/s) | 830 ± 91 | 658 ± 108 | 665 ± 112 | 677 ± 163 | 614 ± 184 |
| ADC ratio | 0.97 ± 0.07 | 0.74 ± 0.09 | 0.76 ± 0.10 | 0.76 ± 0.14 | 0.68 ± 0.15 |
| DWSI ratio | 1.08 ± 0.11 | 1.41 ± 0.17 | 1.40 ± 0.17 | 1.39 ± 0.32 | 1.97 ± 0.41 |
| T2SI ratio | 1.10 ± 0.08 | 1.11 ± 0.11 | 1.10 ± 0.11 | 1.19 ± 0.18 | 1.45 ± 0.20 |
| TTP delay (second) | 2.56 ± 1.66 | 9.09 ± 5.37 | 9.01 ± 5.39 | 0.06 ± 1.81 | 5.63 ± 5.02 |
| Relative CBV | 1.05 ± 0.24 | 0.98 ± 0.35 | 0.09 ± 0.35 | 1.16 ± 0.37 | 0.79 ± 0.31 |
| Relative CBF | 0.87 ± 0.20 | 0.59 ± 0.31 | 0.59 ± 0.31 | 1.31 ± 0.41 | 0.75 ± 0.37 |
Note:—Values are expressed as mean ± SD. ROI indicates region of interest; ΔHU indicates the difference between the Hounsfield unit of the lesion and the control; relative cerebral blood volume (CBV) or cerebral blood flow (CBF) indicates the ratio of lesion value to that of contralateral hemisphere; DWSI, signal intensity on diffusion-weighted MR image; T2SI, signal intensity on T2-weighted image.
* Perfusion weighted MR imaging (PWI) data of 1 patient was not included for the quantitative analysis of PWI values due to poor enhancement of the initial PWI.