试述腹膜后肿瘤的超声特点。

作者: rantiku 人气: - 评论: 0
问题 试述腹膜后肿瘤的超声特点。
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解析 gif">,多普勒频移fd的大小除与血流速度V和发射频率fo成正比外,还与速度矢量和声束轴线之间的夹角θ紧密相关。当θ=0时,cosθ=1,从方程可以看出,此时的fd最大

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