Defining Image Size and Spatial Resolution
In the previous chapter, we gained an understanding of how the MR signal that comes, of course, from the entire slice can be localized to individual locations along the length and width of that slice. It might seem that the number of locations, determined by the number of phase- and frequency-encoding steps, determines the spatial resolution of the image. This, however, is only partially true. As we defined in the very first chapter, spatial resolution is a function of voxel size. Voxel size is determined by not only the number of voxels in the image but also by the dimension of the image along which those voxels are arrayed. Two images of different size, but with the same number of voxels along each in-plane dimension, will have different voxel size and, therefore, different spatial resolution.
KeywordsVoxel Size Pancreatic Head Gradient Strength Receiver Bandwidth Aggregate Signal
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