We also constructed a larger data set which is representative of the true size of a brain. In order to test the effectiveness of our algorithm, we ran it on the same data with and without the contrast point correction for voxel weighting. We found that checking for contrast points preserved boundaries somewhat more clearly. The voxel values range from 0 to 255 and for simplicity can be thought to indicate, respectively, high and low concentrations of water concentration. Each value corresponds to a successively lighter shade of gray that can then be used for display on the computer screen.
Typical scanners can easily display either horizontal or vertical cross sections of the object.
However, algorithms for oblique planes are more difficult, proprietary, and are typically limited to certain angles and parameter values. We must attempt to preserve the correct grayscale values and show as much of the original contrast as possible. Boundaries and other lines and edges must be kept sharp so that distinct regions are distinguishable. In other words, successive elements of the array in the z direction are 5 mm apart whereas elements in the x and y directions are about 0.883 mm apart. Therefore, the shape of each voxel is not a cube but a rectangular prism.