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Schematic of a trapezoidal gradient G(t), gradient induced eddy current Geddy, and accumulated phase φeddy from eddy current in a typical Cartesian SSFP sequence. Eddy currents decay exponentially with multiple time constant τn, thus gradient-switching induced currents from ramp-up and ramp-down gradients do not cancel each other. The accumulated phase is proportional to the amplitude of the trapezoidal gradient ΔG with fixed ramping time Tr and duration Td, as shown in Equation 3.
