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Workflow of extracting breathing signals from sagittal MR images using the BA surrogate. (a) sagittal cine MR images at one slice position, (b) calculation of BA (white area) from sagittal cine MR images. In practice, only the middle section (gray area) was used for BA calculation, (c) the BA-derived breathing curve for a single breathing cycle, and (d) the BA-derived breathing curve for multiple breathing cycles in case of multiple slice acquisitions.
