Automatic calibration method and device of stepping motor and imaging system

Abstract

The invention provides an automatic calibration method of a stepping motor. The automatic calibration method includes: acquiring an actual step count value when a probe reaches a central point of a constant speed area within a current period; on the basis of the actual step count value and preset step number, acquiring step number errors caused by step loss of the stepping motor in an acceleration area and overshoot in a deceleration area within the current period; adopting the step number errors for step number compensation in a next period. By the automatic calibration method, the problem of angle deviation of the stepping motor without a coded disc in the process of quick rotating can be solved, movement position of the probe in the constant speed area can be ensured to be consistent with expectation, the probe can be maintained to collect images in a preset area without angle deviation, and speed of the stepping motor in the constant speed area can be improved while movement accuracy of the probe in the constant speed area is guaranteed.

Description

technical field [0001] The present application belongs to the field of four-dimensional ultrasonic imaging using stepping motors, and in particular relates to an automatic calibration method, device and imaging system for stepping motors. Background technique [0002] With the development of ultrasound imaging technology, 4D (four dimension, 4-dimensional) ultrasound imaging has begun to be applied. 4D ultrasound technology uses 3D (3-dimensional) ultrasound images plus time dimension parameters. This technology can obtain three-dimensional images in real time, surpassing the limitations of traditional ultrasound. [0003] At present, the volumetric probes used in 4D ultrasound imaging systems at home and abroad are mainly mechanical sector probes that drive the probe with a stepping motor and scan the target space area through fan-shaped swing. The imaging system using this mechanical sector-scanning probe requires a stepping motor control system that drives the probe to s...

AI Technical Summary

Problems solved by technology

[0006] The stepper motor in the current 4D ultrasonic probe generally adopts a codeless disc. However, if the stepper motor rotates too fast, it will cause loss of steps in the acceleration range and overshoot in the deceleration range (that is, it cannot be completely stopped at the desired stop position), so It will cause the swing angle of the probe to shift in the uniform motion interval of the imaging, resulting in distortion and distortion of the imaging

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