Magnetic resonance electromyographic signal trigger

Abstract

The invention discloses a magnetic resonance electromyographic signal trigger, comprising a sensor device, a main control unit, a surface electromyography output channel and a nuclear magnetic resonance spectrometer output channel, wherein the sensor device is connected with the main control unit; and the surface electromyography output channel and the nuclear magnetic resonance spectrometer output channel are respectively connected with the main control unit. The trigger only generates a signal the amplitude of which is greater than the threshold upper limit of Vmax; complicated electrocardio signals can be replaced by sine waves, square, waves or triangular waves and the like; meanwhile, simpler trigger signals can ensure the accuracy of the trigger edge, improve the trigger precision and has smaller time error.

Description

technical field [0001] The invention relates to an image acquisition device, in particular to a magnetic resonance myoelectric signal trigger. Background technique [0002] Velocity-encoded phase-contrast magnetic resonance imaging (VEPC MRI) is a new type of imaging technique for evaluating muscle function in vivo. This technique can be used to acquire functional magnetic resonance imaging of skeletal muscles in moving limbs. image. The trigger is a key device for VEPC MR image acquisition, and the trigger generates a signal to trigger the magnetic resonance scan, thereby completing the image acquisition process. In velocity-encoded phase-contrast MRI technology, EMG triggers are required to collect human movement information in the working environment of the MRI instrument (usually a strong magnetic environment). [0003] At present, there is no such myoelectric trigger product in China. Similar foreign products, such as the Optitrig (model: 2D) of the Finnish NOMIR comp...

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Problems solved by technology

[0004] Aiming at the shortcomings of existing myoelectric triggers that convert the trajectory of fluorescent sticks to output digital and analog ECG signals through desktop computers and analog-to-digital conversion software, but the converted signals are unstable, easy to fall off or cause false triggers, the purpose of the present invention is to Provides a small size, easy to install magnetic resonance electromyographic signal trigger, which is more sensitive to the capture of limb movements, generates stable and consistent trigger signals, and ensures the smooth progress of magnetic resonance scanning

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