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. 2018 Nov 23;18:175. doi: 10.1186/s12890-018-0739-9

Fig. 1.

Fig. 1

Image showing measurement of the diaphragmatic inspiratory excursion and TPIAdia in M-mode ultrasound. The A-A is the height of diaphragmatic inspiratory excursion. The B-A is the TPIAdia. TPIAdia, time to peak inspiratory amplitude