The usability of medical devices has increasingly become a focus for many healthcare facilities seeking to reduce the likelihood of error or injury, improve communications of results, and achieve operational cost savings [1,2]. In the U.S., 165 × 106 ultrasound exams are performed with an annual U.S. market of over $1 × 109. This means that improvements to the usability and diagnostic capabilities of ultrasound systems could lead to notable advances in the delivery of healthcare [3].

For a premium ultrasound system, navigation and image processing is based around a touch panel, trackball, and various knobs and buttons for individual features. A sonographer is required to use one hand to operate these controls. The sonographer's other hand controls a probe for scanning a patient's internal organs or blood flowing through blood vessels. Ultrasound systems are often...

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