Methods Observation were done in 30 old patients who successfully underwent myocardial contrast imaging using second harmonic imaging technology.
方法对行超声二次谐波心肌造影的30例患者进行观察。
Methods Observation were done in 30 old patients who successfully underwent myocardial contrast imaging using second harmonic imaging technology.
方法对行超声二次谐波心肌造影的30例患者进行观察。
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