Stereoscopic Visualization of Diffusion Tensor Imaging Data: A Comparative Survey of Visualization Techniques
Figure 6
A 47-year-old female with left temporal glioblastoma multiform (L). (Case 3): (a) axial T1 postgadolinium; (b) grayscale FA (GSFA) map; (c) color coded orientation map (CCOM); and (d) nonstereoscopic view. The question is the left corticospinal tract (CST) (yellow arrow) affected by the lesion or not? The CCOM suggested that the CST was affected by the lesion evidenced by change in its blue color (i.e., fibers have changed their direction), as well as the intensity of the blue color (i.e., fibers have changed their FA value); so conclusion was the CST is infiltrated by the lesion. The images suggest that the ipsilateral CST is almost normal, apart from being slightly displaced, and having a higher FA values compared to opposite side (more yellow areas); so the conclusion was that the fibers are only displaced. The higher FA value could reflect the fibers becoming more compact as a result of the mass effect. To resolve this discrepancy, we resorted to the GSFA images as well as the clinical data. The GSFA showed that both CST have almost the same intensity (i.e., FA values) (white arrow = normal CST), so our conclusion was that the fibers are most likely not infiltrated. A through clinical exam revealed that there is no motor affection.
