Even pace fan-shaped scan running device of type-B ultrasonic

Abstract

The invention relates to a scanning device, in particular to a type-B ultrasonic constant sector scanning moving device which includes a dial on an X-Y plane driven by a motor, a balance arranged on the dial and a slide block which is driven by the balance and can move flatly along the directions of an X shaft and a Z shaft. A swing body provided with a type-B ultrasonic probe is connected with the slide block through a rotary shaft. The swing body can swing along the Y-shaft direction on the X-Z plane; wherein, the slide block is provided with a plane cam swing slot driven by the balance and a contour line of the plane cam swing slot meets an equations set; wherein, d relates to a projection of the distance between the balance and the center of the slide block on the X shaft; R relates to a rotary radius of the balance; a relates to the included angle between the rotary radius of the balance on the dial and the Y shaft; r relates to the distance from a swing shaft to a rotary shaft of the swing body; b relates to the included angle between the swing radius of the swing body and the Z shaft; k relates to a proportionality factor. The invention is also provided with a position sensor sensing the swing position of the slide block. The invention switches the constant rotation of the motor into the constant swing of the sector scanning probe, which is simple in structure and is stable and reliable.

Description

technical field [0001] The invention relates to a scanning motion device, in particular to a B-ultrasonic sectoral scanning motion device capable of realizing uniform-speed sectoral scanning through simple space mechanical transformation. Background technique [0002] At present, the known motion devices for B-ultrasound / UBM sector scanning usually have the following two methods: the first one uses a DC rotating motor to drive the pendulum through a one-stage rotation-swing conversion mechanism, and directly converts the rotational motion into swing. Its principle is shown in Figure 1, is that a pivot pin 2 is provided on the turntable 1 on the X-Y coordinate plane, and the pivot pin 2 drives a slide plate 3 to translate along the X axis, and the slide plate 3 translated along the X axis drives The pendulum swings around the swing center of the pendulum in the Z-X plane. In this driving mode, if the motor driving the turntable 1 rotates at a constant speed, the slide plate ...

AI Technical Summary

Problems solved by technology

[0004] Even if the rotation radius R of the shaft pin 2 is equal to the swing radius r of the pendulum body, and the pendulum body swings at a constant speed, the scanning head installed at the end of the pendulum body also swings according to the cosine law, resulting in serious geometric distortions in the B-ultrasound images at both ends of the scanning process. distortion

The second way is to use a custom motor to directly drive the pendulum, with closed-loop control or without closed-loop control, and the structure itself is complex

If the closed loop is not used, it is difficult to guarantee the consistency and uniform speed of the movement; if the closed loop is used, the cost will be high

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