Two-dimensional; Color Dopper ultrasound; Lower limbs deep vein; Diagnosis.
二维；彩色多谱勒超声；下肢深静脉；血栓；诊断。
Color Dopper ultrasonography shows high value and can be as the first choice in diagnosing CAF.
结论超声心动图对先心病caf有较高的诊断价值，可作为首选检查方法。
It is found that doppler-shift can influence the resonant position and Dopper-shift is more obvious if Rabi frequency is larger.
结果表明，多普勒频移对共振位置有精细的影响，并且拉比频率越大多普勒频移更加明显。
It is found that doppler-shift can influence the resonant position and Dopper-shift is more obvious if Rabi frequency is larger.
结果表明，多普勒频移对共振位置有精细的影响，并且拉比频率越大多普勒频移更加明显。
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