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A voxel (volume element) is defined as the individual picture element of a CT image, which has dimensions in the x and y plane, and includes the CT slice thickness as the third dimension (z axis).
The grid is made up of small cubes called ‘voxels,’ and each voxel has a specific address.
Thus, the signal from each image voxel is then proportional to the amount of blood that entered the voxel in the delay between the selective inversion pulse and the image acquisition.
The map demonstrates that, with our methods and subjects, changes in a voxel 's gray matter fraction of 0.17 or less, depending on brain region, would have been detectable.
Greene has pointed out the computational advantages of operating in voxel space for quickly checking for obstructions as well as determining direct lighting.
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