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. Author manuscript; available in PMC: 2019 Sep 1.
Published in final edited form as: J Neuroimaging. 2018 May 24;28(5):530–534. doi: 10.1111/jon.12525

Figure 1.

Figure 1

Illustration of the different imaging markers of mass effect.

A) shows the baseline (BL) diffusion-weighted image (DWI) with the stroke lesion outlined in blue. B) shows the coregistered follow-up (FU) DWI with the baseline lesion superimposed in blue. Newly infarcted tissue is outlined in red, and is excluded from the swelling volume measurement. The swelling volume corresponds to the region surrounding the blue baseline stroke lesion outline. C) Outline of the ipsilateral (green) and contralateral (yellow) hemisphere. The relative change in hemisphere volume is the FU hemisphere volume minus the BL hemisphere volume divided by the BL hemisphere volume. The hemisphere ratio is calculated as the FU ipsilateral hemisphere volume divided by the FU contralateral hemisphere volume. D) Outline of the ipsilateral (green) and contralateral (yellow) lateral ventricle volume. An analogous approach as in C) was used to calculate CSF displacement measurements, except that the lateral ventricle volumes were used.