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- W2003669494 abstract "Spatial misregistration of signal recovered from flowing spins within vascular structures is a common phenomenon seen in MR imaging of the CNS. The condition is displayed as a bright line or dot offset from the true anatomic location of the lumen of the imaged vessel. Its origin is the time delay between application of the phase- and frequency-encoding gradients used to locate spins within the plane of section. The principal condition necessary for the production of spatial misregistration is flow oblique to the axis of the phase-encoding gradient. Flow-related enhancement (entry slice phenomenon), even-echo rephasing, and gradient-moment nulling contribute to the production of the bright signal of spatial misregistration. Familiarity with the typical appearance of flow-dependent spatial misregistration permits confirmation of a vessel's patency; identification of the direction of flow; estimation of the velocity of flow; and differentiation of this flow artifact from atheromas, dissection, intraluminal clot, and artifacts such as chemical shift." @default.
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- W2003669494 date "1990-11-01" @default.
- W2003669494 modified "2023-09-28" @default.
- W2003669494 title "Spatial misregistration of vascular flow during MR imaging of the CNS: cause and clinical significance." @default.
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- W2003669494 doi "https://doi.org/10.2214/ajr.155.5.2120946" @default.
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