A transoesophageal echocardiogram, or TOE, is an alternative way to perform an echocardiogram. A specialized probe containing an ultrasound transducer at its tip is passed into the patient’s oesophagus. This specialised probe, called a transducer, is used to send ultrasound waves to the heart. As the ultrasound waves bounce off the structures of the heart, a computer in the echo machine converts them into pictures on a screen. It has several advantages and some disadvantages compared to a transthoracic echocardiogram (TTE).