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Figure 10.17: Thickness determination procedure using zero-crossings of the second directional derivatives along sheet normal direction. (a) Basic concept of thickness determination procedure. (b) Interpolation of discrete MR data. (c) Zero-crossing search procedure. (( 2004 IEEE)

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Figure 10.17: Thickness determination procedure using zero-crossings of the second directional derivatives along sheet normal direction. (a) Basic concept of thickness determination procedure. (b) Interpolation of discrete MR data. (c) Zero-crossing search procedure. (( 2004 IEEE)

defined as the points with the maximum and minimum values of f'(s) among those satisfying the condition given by f"(s) = 0. Let f (s) have its maximum and minimum values at s = p and s = q, respectively. The measured thickness, T is defined as the distance between the two detected boundary points, which is given by

The procedures for thickness determination from a volume dataset in the previous section.

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