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Figure 7. An illustration of various forms of distortion in MRI using a phantom consisting of a coplanar array of water-filled tubes embedded within in a circular solid plastic (PMMA) block. System distortion effects are seen in the apparent curvature of the tubes at A and their disappearance at B, which was due to warping distortion of the imaging plane. Magnetic susceptibility differences due to the presence of the plastic support block at C give rise to object-induced distortions in the form of discontinuities at the point where each tube enters the support block [10]. (Reproduced with permission from Elsevier).
