Often structures of interest may have curvilinear morphology that multiplanar and oblique images cannot capture in a single 2D image [51,54]. This restriction can be overcome using curvilinear sectioning techniques, as demonstrated in Fig. 4. A trace along an arbitrary path on any orthogonal image defines a set of pixels in the orthogonal image that have a corresponding row of voxels through the volume image. Each row of voxels for each pixel on the trace can be displayed as a line of a new image, which corresponds to the curved planar structure lying along the trace. This technique is useful for curved structures that remain constant in shape through one orthogonal dimension (one degree of freedom), such as the spinal canal, orbits of the eyes, and meniscii in the knee.
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