Article Figures & Data
Figures
- Fig 1.
Axial 8-T GE images of the corona radiata obtained above the lateral ventricles. Parameters used to image the live and postmortem brain were TR/TE, 1000/16; FOV, 20 cm; matrix, 1024 × 1024 pixels; and section thickness, 2 mm.
A, The live brain.
B, The unembalmed postmortem brain.
C, The embalmed postmortem brain.
D–F, The enlarged regions of the images shown in A (D), B (E), and C (F). Note that the leptomeningeal (LM) and intraparenchymal (IP) vessels are present on both sets of images obtained in live and unembalmed postmortem brain, whereas the perforating cortical (PC) vessels are seen only on images of the live brain. None of these vessels are easily differentiated on images of embalmed postmortem brain. Most leptomeningeal and intraparenchymal vessels appear hyperintense and are difficult to visualize when filled and surrounded by formalin.
- Fig 2.
Axial 8-T images of the basal ganglia (A and B) and midbrain (C and D) acquired from the same unembalmed postmortem brain by using GE pulse sequences with shorter (A and C) and longer (B and D) TEs. Parameters for A and C were 750/6; FOV, 20 cm; matrix, 512 × 512 pixels; and section thickness, 4 mm. Parameters for B and D were 750/17; FOV, 20 cm; matrix, 512 × 512 pixels; and section thickness, 4 mm. Note improvements in the gray matter–white matter contrast and the visibility of the perivascular spaces (PS) with the longer TE. The vasculature is better seen on the GE images acquired with a longer TE because of the increased susceptibility effects surrounding vessels, such as the septal vein (SV) and the cerebral vessels (CV).
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