Basic diaphragm ultrasound training: Curriculum implementation and learning trajectory among diaphragm ultrasound naive trainees

Figure 2 Excursion measurements for diaphragm. A: Correct and incorrect methods of measurements for right diaphragm excursion. Measurements A: Correct position to put calipers; measurements B: Incorrect position to put calipers - on the exterior of the diaphragm; measurements C: Incorrect position to put calipers - on the interior of the diaphragm; B: Excursion measurements for left diaphragm at resting tidal breathing. Measurements A: Shows direction of diaphragmatic movement and position of calipers for measurement if M mode could not be used accurately due to the plane of diaphragmatic movement.