Contrast, spatial frequency, presentation time, moving velocity and phase reversal frequency of each grating are controlled independently.
每组光栅的对比度、空间频率、显示时间，移动速度和反相频率能单独控制。
Conclusions The increase trend of pulmonary venous reversal flow velocity can reflect indirectly the worsening of LV diastolic disfunction;
结论肺静脉反流速度的增大趋势可以间接地反映左室舒张功能的恶化趋势；
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