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Schematic of the Hadamard encoded CASL with two interleaved background suppression pulses (shown as dashed vertical lines). (a) long labeling CASL control sequence, and (b) label sequence at single post-labeling delay (0.7 s) with interleaved background suppression pulses; (c) Eighth Hadamard encoding without interleaved background suppression and (d) with interleaved background suppression for the seven-delay Hadamard encoded method.
