Abstract: A transient electromagnetic device with variable shape and turns includes squares, a transmitting coil carrying frame, a transmitting coil, a turns-variable device, a current generator and a working power supply. The transmitting coil carrying frame is arranged inside the transmitting coil; the transmitting coil carrying frame is configured as a carrier of the transmitting coil, and configured for adjusting a side length of the transmitting coil and a shape of the transmitting coil; the square is configured for clamping and connecting the transmitting coil and the transmitting coil carrying frame to fix the transmitting coil to the transmitting coil carrying frame. The current generator is configured for generating transient current; the turns-variable device is configured for changing the turns of the transmitting coil; and the transmitting coil is configured for transmitting the transient current to a target area to be measured.

Abstract: Systems, methods, and media are provided for image correction of magnetic resonance images (MRIs). Operations include capturing image data using a medical imaging system, and identifying respiratory principal components and cardiac principal components from the image data. The operations also include classifying the cardiac principal components based on whether the cardiac principal components are associated with expiration events or inspiration events of the respiratory principal components, and generating corrected cardiac images using the classified cardiac principal components.