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Schematic representation of our methods for data preprocessing through to M-mode creation and subsequent model development. (a) Frames in a 3 s LUS clip. (b) Vertical slice selection (red), restricted by pleural line ROI (green). (c) Vertical slicing across all frames. (d) Concatenating slices to form an M-mode image. (e) Obtaining the model’s prediction for the M-mode input image. (f) Final model output representing probability of absent lung sliding.
