Evaluation of perivascular fat density and residual false lumen formation following TEVAR in Stanford type B aortic dissection

Figures

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  Figure 1. Sagittal CTA of the aorta post-TEVAR surgery. (A) Residual false lumen around the stent following TEVAR; (B) closure of the false lumen around the stent after TEVAR.

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  Figure 2. Flowchart of patient screening and inclusion criteria.

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  Figure 3. Automated aortic segmentation, range selection, and 3-D visualization workflow. (A) Sagittal CT slice showing the automatically segmented aortic mask (red overlay); (B) straightened (centerline-reformatted) aorta; the segment between the two red bars defines the quantitative analysis range. (C) Three-dimensional surface rendering of the aorta, with the same proximal and distal limits (red bars) demarcating the analysis segment. (D) Composite 3-D rendering of the selected aortic segment and its surrounding PVAT: the aorta is displayed in red, HU close voxels in green, and HU distance voxels in yellow.

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  Figure 4. Multiplanar CT segmentation of perivascular adipose tissue (PVAT). (A) shows an axial (transverse) slice, (B) a coronal slice, and C a sagittal slice. The aortic lumen is delineated in red (aortic mask); PVAT immediately adjacent to the aortic wall is highlighted in green (HU close mask), while PVAT located farther from the wall is indicated in yellow (HU distance mask).

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  Figure 5. Interactive visualization of perivascular adipose tissue (PVAT) surrounding the stented aorta.

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  Figure 6. ROC curve analysis. (A) ROC curve for HU Δ; (B) ROC curve for HU ratio.