An ultrasonic imaging technique that is used to evaluate heart structures and is performed inside the esophagus is known as a/an echocardiography (tee).

Transesophageal

Explanation:

According to my research and the Johns Hopkins University medical team, this type of technique is called a Transesophageal Echocardiogram. These machines use echoes which are sent to a machine which then transforms them into images. This specific technique sends a small device with a transducer (which creates the echoes) down the esophagus to create the images.

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