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(a) Drop in signal-to-noise ratio (SNR) of the liquid embolic agents per minute. Onyx 18® = 0.6 per minute. SQUID12® = 0.4 per minute. SQUID 18® = 0.2 per minute. (b) Drop in SNR for Onyx 18®, SQUID 12®, and SQUID 18® at five-minute increments from minute 1 to minute 30 after preparation.
