Pure Materials

For a single pure material it is assumed that the measurement function has the form

FIGURE 12 A volume-rendering image of a human hand dataset. The opacity of different materials is decreased above cutting planes to show details of the classification process within the hand. See also Plate 19.

collected on, some collection parameters, the voxel size, and the figures in which each dataset appears. The GE machine was a 1.5T Signa. The Bruker machine was an 11.7T AMX500. Acquired data were collected with a spin-echo or fast spin-echo protocol, with one proton-weighted and one T2-weighted acquisition. The tooth was acquired with a technique described in Ghosh et al. [20]. Preprocessing was only performed on data used for the hand example (Fig. 12). For this case each axial slice was multiplied by a constant and then offset by another to compensate for intensity falloff as a function of the distance from the center of the RF coil. The constants were chosen to make the mean values of user-identified material regions consistent from slice to slice.

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