Distribution of MR Imaging Parameters during the Acute Phase of Ischemic Stroke
| MR Imaging Parameter (No. of Tissues) | Total n = 200 (%) | rt-PA Treatment n = 49 (%) | No rt-PA Treatment n = 151 (%) | P Value* |
|---|---|---|---|---|
| Signature number | ||||
| <3 | 43 (21.5) | 10 (4.5) | 33 (17.0) | |
| 4 | 71 (35.5) | 21 (10.5) | 50 (25.0) | |
| 5 | 57 (28.5) | 10 (5) | 47 (23.5) | |
| ≥6 | 29 (14.5) | 8 (4) | 21 (13.82) | 0.49 |
| rADC | ||||
| Median | 0.78 | 0.79 | 0.77 | 0.91 |
| (2nd, 3rd QL) | (0.66, 0.91) | (0.68, 0.90) | (0.65, 0.92) | |
| rT2 | ||||
| Median | 18 | 1.19 | 1.17 | 0.20 |
| (2nd, 3rd QL) | (1.09, 1.33) | (1.10, 1.34) | (1.10, 1.25) | |
| ADC | ||||
| Median | 609.8 μm2/s | 620.4 μm2/s | 608.3 μm2/s | 0.79 |
| (2nd, 3rd QL) | (513.8, 694.6) | (548.5, 675.4) | (497.1, 707.5) | |
| T2 | ||||
| Median | 85.1 | 81.0 | 86.2 | 0.04 |
| (2nd, 3rd QL) | (78.0, 97.6) | (76.7, 89.3) | (78.1, 98.9) | |
| Stroke onset to MR imaging time | ||||
| Median | 9.4 | 7.9 | 9.8 | 0.24 |
| (2nd, 3rd QL) | (7.8, 11.8) | (5.6, 12.0) | (8.8, 11.0) |
Note.—rt-PA indicates recombinant tissue plasminogen activator; rADC, relative apparent diffusion coefficient; rT2, relative T2; QL, quartile; ADC, apparent diffusion coefficient.
* Comparison between rt-PA-treated and non-rt-PA-treated groups using the generalized estimation equations approach considering the correlation among sections and among tissues.