The ultrasound machine is mainly used for research in voice and swallowing. The ultrasound machine releases and collects sound waves to form real-time images, which can be used for assessing functions of vocal folds and swallowing mechanism, and as a biofeedback in dysphagia treatment. The Esaote MyLab Gamma ultrasound machine is compatible with two probes, including linear and convex transducer. The linear one is usually used in voice research and the convex one is frequently used in swallowing studies.