Table 2.
The 320-detector row CT hardware, software, protocol and CTP parameters utilized in this study.
| CT configuration | 320 × 0.5 mm detector row |
|---|---|
| Contrast amount | 50-70 ml by automated antecubital venous injection |
| Contrast infusion rate | 4-6 ml/s |
| Reconstructed section thickness and section interval | 0.5 mm with 0.5 mm reconstruction interval |
| Section collimation | 0.5 mm |
| CT matrix | 512 × 512 |
| Kilovolts (kVp) | 80 kVp |
| Milliamp (mA) | 100 mA for 21 individual data sets in cases 1-4. Initial 300 mA then 100 mA series for 19 individual data sets in case 5 |
| Size of detector array; field of view | 160 mm |
| Software and version | Vitrea fX version 2.0.2 |
| Singular value decomposition (SVD) cutoff threshold | 5% |
| Perfusion algorithm utilized | SVD+ |
| Vascular pixel elimination | On |
| Dose length product to milliSieverts (mSv) | 4.3 mSv for cases 1-4 and 4.4 mSv for case 5 |
| Arterial input function selection location | Middle cerebral artery M1 segment |
| Venous input function location | Superior sagittal sinus |
| Automatic or manual arterial input and venous input function selections | Manual contralateral unaffected hemisphere for case 1. Automatic arterial input function and venous input function selection for cases 2-5 |
| Region of interest (ROI) dimensions | 8 mm diameter × 0.5 mm depth |