Limitations of Parallel Imaging
There are two significant limitations to the application of parallel imaging: these are, on the one hand, relatively demanding hardware requirements including multi-channel RF receivers as well as multi-element coil systems combined with appropriate reconstruction systems and software. Most currently available new MRI systems fulfil all these requirements for parallel imaging or can be upgraded relatively easily, but older existing installations will often be too limited and not flexible enough for parallel imaging. On the other hand, not all protocols are equally suited for parallel imaging, and certain restrictions with respect to SNR, image geometry, or maximum achievable acceleration factors must be kept in mind. Nevertheless, parallel imaging has turned out to be one of the most important recent developments in MR imaging, impacting examination protocols in virtually all areas of research imaging and clinical MRI.
KeywordsParallel Imaging Acceleration Factor Coil System Image Geometry Coil Element
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