Fig. 1From: Ultrasound and non-ultrasound imaging techniques in the assessment of diaphragmatic dysfunctionReproduced with permission from The American Physiological Society: Wait et al. J Appl Physiol 1989;67(4):1560–1568Relationship of diaphragm thickness measured in situ in 10 human cadavers by ultrasound and in vitro by a ruler. Ultrasound measurements of diaphragm thickness in situ are as accurate as measurements in vitro with a ruler.Back to article page