Volumetric Imaging: The Three-dimensional Fourier Transform
In almost all imaging applications, we are in fact interested in viewing a volume of tissue; a single slice just does not convey sufficient clinical information to be useful. How then do we do it? In many, perhaps most, cases, we acquire a set of separate images, each representing a slice of tissue. If we set up the scan so that the slices are adjacent to each other, we will represent the volume of interest as a set of contiguous slices. However, it is important to recognize that these slices are in fact independently acquired images. We will now discuss an alternative approach. In three-dimensional imaging, the entire volume of tissue is imaged at once and, so to speak, chopped up after the fact into a group of slices.
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