An Ultrasound Without the Goo?

Ultrasound is a powerful tool for looking inside the body. The scans see through layers of tissue to reveal pumping hearts, developing fetuses, troublesome blood clots, and injured muscles. They are relatively low-cost, portable, and have few side effects. Patients aren't exposed to ionizing radiation or confined in a small space. They are, however, slathered in goo. Most of the time, having a body part temporarily coated in a cold, sticky substance and then pressed on by a technician is a small...