Figure 5
Fourier magnitude spectrum averages by `distance' and template. `Distance' was computed as the Euclidean distance from the zero-frequency component and was rounded to the nearest integer. Templates used for template matching at a radius of 10 voxels are shown (Fig. 1). `Sphere (theory)' refers to the theoretical derivations made in Section 3.4 with R = 10 (Friedman, 1997). Magnitude spectrum averages were linearly scaled to the interval [0, 1] to facilitate curve-shape comparison. |