Article Figures & Data
Figures
- FIG 1.
Patient flow chart. *The full-text search was conducted in the local PACS and included the descriptors “acute stroke,” “cerebrovascular insult,” and “National Institutes of Health Stroke Scale” as well as corresponding abbreviations.
- FIG 2.
Study workflow.
- FIG 3.
Classification scheme.
- FIG 4.
Examples of different categories of agreement or disagreement. Figure shows Tmax maps for semiautomated (upper row) and automated postprocessing. A, Agreement. B, Agreement with outliers. Please note contralateral areas of Tmax > 4 seconds indicated in blue in the RapidAI map. C, Tmax > 4 seconds overestimation. Please note how the Tmax >4 seconds lesion of RapidAI extends beyond the lesion of perfusion delay in the Syngo.via Tmax map. D, No Tmax > 6 seconds lesion. E, Volume mismatch. F, Color reference for perfusion maps derived from Syngo.via. G, Color reference for perfusion maps derived from RapidAI.
- FIG 5.
Patterns of agreement and disagreement between semiautomated and automated postprocessing.
- FIG 6.
Bland-Altman plots for the comparison of mismatch estimates of semiautomated and automated postprocessing. Mismatch volume derived from semiautomated postprocessing (mL) as compared with mismatch volume derived from automated postprocessing (mL). A, In the upper graphic, automated postprocessing mismatch volume was defined as volume of Tmax >4 seconds – volume of CBF <30%. B, In the lower graphic, automated postprocessing mismatch volume was defined as volume of Tmax > 6 seconds – volume of CBF <30%. In both graphics, semiautomated postprocessing mismatch volume was defined as volume of Tmax lesion – volume of CBV lesion. For both comparisons, the discrepancy of mismatch volume was larger for patients with larger average volume of the perfusion lesion. SD indicates standard deviation.
Tables
All Patients (n = 49) Age (years, median [IQR]) 76 (15) Sex (male patients) 33 (67.3%) Median NIHSS at admission (IQR) 6 (5) Note:—One patient experienced 2 distinct MDVO strokes with a time lag of several months and CTP data sets from both events were included.
Occlusion Location All Data Sets (n = 50) M2 22 (44%) M3 18 (36%) M4 2 (4%) A1 0 A2 0 A3 1 (2%) P1 0 P2 6 (12%) P3 1 (2%) Note:—One patient experienced 2 distinct MDVO strokes with a time lag of several months and CTP data sets from both events were included.
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