3results about How to "Avoid artifacts" patented technology

The application discloses a kind of autonomous ultrasonic robot multimode drag control method and device.The method comprises: obtaining real-time ultrasound image and the force data value of mechanical arm end;Determine whether the pixel value of ROI region of the ultrasound image of continuous preset frame number is greater than preset pixel threshold value: if yes, according to force data value and first initial control parameter, it is calculated to obtain the target displacement amount in X axis direction and Y axis direction, simultaneously, according to force data value, preset expected force and second initial control parameter, it is calculated to obtain the target displacement amount in Z axis direction;Tool coordinate system under target displacement amount is converted into world coordinate system under target displacement amount;Zero force control is implemented in the horizontal direction of probe contact surface, and constant force control is implemented in the vertical direction of probe contact surface, until probe moves to target position.The method improves the operation flexibility and scanning safety by the synergistic effect of zero force control and constant force control.

This invention discloses a multi-channel electromagnetic induction detection method and system based on uniform magnetic field constraint. A uniform magnetic field is constructed within the detection area of ​​the structure under test. Electromagnetic induction response signals are acquired through multiple channels under the constraint of the uniform magnetic field, and the spatial coordinates of each acquisition channel are marked. The raw electromagnetic induction signals acquired by each channel are preprocessed, including noise reduction filtering, envelope extraction, and amplitude normalization. A deep learning model is then used to extract structural features from the preprocessed multi-channel electromagnetic response signals. Based on the spatial position information of each acquisition channel, magnetic field uniformity parameters, and response characteristics, a channel correlation weight matrix is ​​constructed to describe the spatial consistency and physical coupling relationships between channels. A multi-channel joint optimization model is constructed, and the equivalent electromagnetic parameter distribution inside the structure under test is reconstructed through iterative solution. This invention improves the reliability, repeatability, and engineering applicability of electromagnetic induction detection results.

The utility model relates to medical anti -counterfeit image neck cover technical field, and disclose a kind of adjustable pressure type inflation anti-counterfeit image neck cover device, including pneumatic support assembly, the quantity of pneumatic support assembly is two groups, pneumatic support assembly includes telescopic air bag and two groups of plastic supporting block;Inflation and deflation component, the inflation and deflation component includes air pipe and micro dual-purpose air pump;Neck wear, the both ends of neck wear are respectively connected with corresponding plastic supporting block fixedly;Guiding component, the guiding component is fixedly installed between two groups of plastic supporting block, and guiding component includes support sleeve and cylindrical rod, and compression spring is arranged in support sleeve cavity. By setting telescopic air bag between two groups of plastic supporting block, by micro dual-purpose air pump cooperation air pipe to telescopic air bag inflation and deflation, telescopic air bag inflation when bulging will two groups of plastic supporting block be mutually far away, to support between the head of patient and shoulder, effectively reduce the neck shaking amplitude caused by breathing, to avoid the appearance of CT artifact.