Research Article

Effects of Compound Danshen Injection Combined with Magnesium Sulfate on Pregnancy-Induced Hypertension Syndrome under the Guidance of Empirical Mode Decomposition Algorithm-Based Ultrasound Image

Figure 3

Multilayer instantaneous frequencies of blood flow signal decomposed by the optimized EMD algorithm: (a) 1∼2 layers; (b) 3∼4 layers; (c) 5∼6 layers.
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