Intravoxel Incoherent Motion (IVIM) refers to translational movements which within a given voxel and during the measurement time present a distribution of speeds in orientation and/or amplitude. The IVIM concept has been used to estimate perfusion in tissues as blood flow in randomly oriented capillaries mimics a pseudo-diffusion process. IVIM-based perfusion MRI, which does not require contrast agents, has gained momentum recently, especially in the field oncology. In this introduction the basic principles, models, technical requirements and limitations inherent to IVIM-based perfusion MRI, as well as new, non-perfusion applications of IVIM MRI, such as virtual MR Elastography will be outlined.
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