Abstract
When certain echo paths of a balanced-SSFP (b-SSFP) sequence (see Chap. 57) are out of phase during the data acquisition, a destructive interference pattern is seen. The resultant signal voids occur predominantly in areas, such as air-tissue interfaces, where tissues display relatively large differences in magnetic susceptibility. These differences degrade the homogeneity of the local magnetic field, leading to a rapid dephasing of encoded echoes. The inner ear is a good example of a complex tissue with areas of very different magnetic susceptibility in close proximity, being composed of air, bone, nerves, and vessels. In order for high-resolution b-SSFP techniques to have clinical utility in such areas of highly variable magnetic susceptibility, the CISS (constructive interference in a steady state) technique was developed.
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Runge, V.M., Heverhagen, J.T. (2022). Constructive Interference in a Steady State (CISS). In: The Physics of Clinical MR Taught Through Images. Springer, Cham. https://doi.org/10.1007/978-3-030-85413-3_59
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DOI: https://doi.org/10.1007/978-3-030-85413-3_59
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