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Subtraction of contrast enhanced magnetic resonance images acquired before and after the injection of a contrast agent is a common method used in clinical applications for identifying the tumor region. Because of the long duration of the acquisition process, patient movement and respiratory motion are induced and registration is required to obtain accurate… (More)
In this paper, some properties of families of stable matrices are studied. It is shown that various families of stable matrices are contractible, and as a consequence these families are simply-connected.