Mobile CT synchronous scanning control system and method

Abstract

The invention relates to a mobile CT synchronous scanning control system, wherein a master controller is used for sending run command information to a synchronous control module; the synchronous control module is used for converting the command information to controlled quantity of each driver and respectively sending the controlled quantity to a driver of a rotating frame rotary motor control module and a driver of a rotating frame horizontal motor control module; the drivers of the rotating frame rotary motor control module and the rotating frame horizontal motor control module are used for respectively driving respective motors according to the controlled quantity; encoders of the rotating frame rotary motor control module and the rotating frame horizontal motor control module are used for feeding back actual locations and speed information to the synchronous control module; and the synchronous control module is also used for calculating synchronized error and compensation of the above dual motors according to the actual locations and speed information of the motors. The invention also relates to a mobile CT synchronous scanning control method.

Description

【Technical field】 [0001] The invention relates to a mobile CT synchronous scanning control system and method. 【Background technique】 [0002] In the current CT helical scanning synchronous control system, the mechanical transmission chain is mostly used. The increase in the number of internal parts not only increases the cost pressure, but also violates the original intention of the portable design of the mobile CT. The inherent step loss problem of the motor reduces the precision of the screw synchronization. [0003] Mobile CT scanners have multiple imaging modes, one of which is helical scanning. In this mode, the rotating frame equipped with the main components of the image chain such as X-ray tubes, detectors, and data acquisition systems is driven by a direct drive motor to continuously rotate, while the rotating frame moves horizontally. These two movements have a certain positional correspondence to achieve uniform projection data acquisition. In fact, whether it ...

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Problems solved by technology

The patent application with the application number 201110273871.7 proposes a master-slave synchronous control strategy to realize the synchronous control of dual motors, but the inherent defect of the master-slave synchronous control method is that when the slave motor is affected by interference, the master motor cannot perceive and follow the movement of the slave motor. Changes, poor synchronization accuracy, and certain limitations

[0004] At present, in the mechanical structure of large fixed CT scanners, the rotating frame and the horizontal moving bed are two separate and independent components, and the loads of the rotating frame and the scanning bed are very different. When the slave motor is disturbed, the master motor cannot track the change of the slave motor in time, and the synchronization accuracy is poor, which has great limitations

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