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Demonstration of diaphragm excursion using B-mode. M-mode can then be applied as perpendicular to the diaphragm as possible and activated to obtain a quantitative value. The image was obtained using a 3.5-MHz transducer. The transducer is in longitudinal orientation and placed perpendicular to the chest wall to scan through the 6th intercostal space at the mid axillary line. Video available on AccessMedicine.com.