You can get an X-ray to see your bones, an MRI to see your brain, and a CT scan to see virtually everything else. But getting a glimpse of the gastrointestinal tract (the esophagus, stomach, and intestines) is a little more invasive. Endoscopes have been able to provide doctors with a picture of their patients' insides, but they have their limitations: For instance, the person performing the endoscopy needs extensive training on guiding the camera down the patient's throat. It's also a time-intensive procedure that requires the patient to be sedated.