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为了通过小的透声窗显示尽量大的扫描视野,已研制出多种扇形扫描探头,它们通过相同透声窗显示的视野大小,主要取决于其与体表的接触面积。这一问题.似乎已能由相控阵式探头圆满解决。 实际上,人体各部位最小的透声窗并不在体表,而是位于体内一定深度,如肋骨间隙、肺边缘等。所以,即使探头与人体的接触面积只有一个点,声束的传播仍会受到阻碍而形成死角(图1左)。要取得更大的视野,就必须使扫描声束全部通过人体内
In order to show as large a scanning field of view as possible through a small translucent window, a variety of sector scan probes have been developed whose size of field of view through the same translocannion depends primarily on their area of contact with the body surface. This problem seems to have been satisfactorily solved by phased array probes. In fact, the smallest part of the human body through the sound window is not in the body surface, but located in the body a certain depth, such as the ribs gap, lung margin. Therefore, even if the contact area between the probe and the human body is only one point, the propagation of the sound beam will be hindered to form a dead space (Figure 1, left). To gain a broader view, you must make the scanning sound beam all through the body