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. 2022 Dec 1;12(12):3014. doi: 10.3390/diagnostics12123014

Figure 1.

Figure 1

Illustration of one measure as a candidate for baseline CTP-based collateral score: relative CBV multiplied by the total volume of brain tissue defined by time-to-maximum (Tmax). (A): Areas with various Tmax value ranges; (B): The corresponding CBV values of A (mL/100 mL); (C): Mask for Tmax 6–10 s. The contralateral mask is acquired by mirroring the ipsilateral mask using the midline; (D): CBV within mask C. The score is the mean CBV of the ipsilateral masked volume relative to the mean CBV of the contralateral masked volume multiplied by the total volume of all the voxels with a Tmax value of 6–10 s.