The entry slice phenomenon arise in MRI when blood with unsaturated spins flows in the observed slice(s). These spins will emit a strong signal, because of their unsaturated status (flow related enhancement). The number of slices affected depends on the flowvelocity and the slice thickness; the direction of flow determines which slices are affected.
Time of FlightMRA is based on this entry slice phenomenon.
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Further Reading:
Case Study 1 :
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