This study evaluates the movement of the diaphragm (which is the main muscle used for breathing). It will compare two ultrasound modalities: linear ultrasound versus curvilinear ultrasound, at measuring diaphragm motion. The proposed measurement method with linear ultrasound is novel, and will be compared against the established method with curvilinear ultrasound. The investigators hypothesize that the novel method will have several potential advantages, including: it may be easier to learn, quicker to perform, and have a lower failure rate.
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Time taken to measure diaphragmatic excursion
Timeframe: 60 minutes