Motion control device and method for patient moving bed board and computer program

Abstract

The invention provides a motion control device and method for a patient moving bed board and a computer program. The method comprises the step that an incremental encoder is endowed with an initial position value so that when the patient moving bed board starts to move from the initial position, the initial value of the incremental encoder is the initial position value, wherein the initial position value is obtained after error correction of a position absolute value read by an absolute value encoder at the initial position according to a pre-stored error curve; the error curve is a curve, changing with positions, of the position absolute value relative to a corresponding displacement increment value, the curve comprises a starting displacement section, an intermediate displacement sectionand an end displacement section which are continuous in sequence, the difference is larger than 0 at the starting displacement section and the end displacement section, and the difference is smallerthan or equal to 0 at the intermediate displacement section.

Description

technical field [0001] The invention relates to the field of medical detection, in particular to a motion control device and method for a patient to move a bed board, and a computer program for executing the method. Background technique [0002] In medical detection systems such as magnetic resonance and computed tomography, the patient is usually carried by the patient bed, and the patient bed is equipped with a movable bed board that can enter and exit the scanning cavity, which is used to position the patient to the position to be scanned or move it as needed during the scanning process . In order to obtain high-quality scanning images, it is necessary to perform precise motion control on the patient's moving bed. In the prior art, an encoder-based drive motor can be used to drive the patient's mobile bed to move between the starting point and the end point, and the position feedback of another encoder can be used as a reference position for position calibration, for exa...

AI Technical Summary

Problems solved by technology

[0005] Since there are different error curves corresponding to different starting positions, the absolute encoder has multiple errors of different sizes at the same position. Therefore, when calibrating the incremental encoder through the readout value of the absolute encoder , it is necessary to set a larger error tolerance rate to tolerate all these errors as much as possible, resulting in low calibration accuracy and motion control accuracy, which may affect image quality and even cause missed detection of real system errors; and if the error tolerance rate is reduced, there will be Unnecessary system alarms may be caused due to errors exceeding the fault tolerance range, affecting the normal progress of the scanning process

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