FIG 2. Images of a 63-year-old man with right parietal glioblastoma.

A, Conventional fast spin-echo T2-weighted image shows peritumoral white matter edema around the right lateral ventricle that is pressed down by the tumor. The precise location of the right corona radiata and the posterior limb of the left internal capsule are not apparent on this image.

B, Color-coded image constructed from three inverted orthogonal diffusion-weighted images. Fibers running superoinferiorly, anteroposteriorly, and transversely are displayed with red, blue, and green, respectively. Because the T2 shine-through phenomenon counteracts the contrast caused by diffusion, the peritumoral edema is not distinct from normal brain.

C, Color-coded image created from three orthogonal ADC maps.

D, Image after registration and addition of the images shown in A and B has a contrast similar to and a quality superior to those of the image shown in C. The right deep white matter with edema is clearly resolved into three parts: from medial to lateral, the corpus callosum (green, arrow), corona radiata (orange, arrowhead), and superior longitudinal fasciculus (blue, open arrow). The posterior limb of the left internal capsule can be easily identified by the red hue (open arrowhead).