Method and device for visualizing surface-like structures in volumetric data sets
a volumetric data and surface-like technology, applied in the field of three-dimensional medical imaging, can solve the problems of inability to directly perform calculations, increase data size, and low amount of memory, and achieve the effect of facilitating and speeding up calculations
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[0055]FIG. 1 shows a conventional ultrasound (acoustic) grid with an apex A, beams 1 and rows 2, wherein beams 1 and rows 2 represent the acoustic coordinate system (e.g. range and azimuth, respectively) in a two-dimensional representation. The third dimension, e.g. the elevation of a spherical coordinate system, is not shown in FIG. 1 for better understanding of the present invention.
[0056]As described above, the local gradient vector G is defined by local gradient vector components Ga and Gb of a sample point P, wherein these components may be calculated by a differencing scheme as mentioned above.
[0057]FIG. 2 schematically shows the transformation of an external parameter, such as a light source LS, from a global coordinate system GCS into local coordinate systems, namely a first local coordinate system LCS1 and a second local coordinate system LCS2, which are defined at a first sample point P1 and a second sample point P2 in an acoustic grid as shown in FIG. 1.
[0058]Each sample ...
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