The three doctors at the Heart Hospital in London say they designed their virtual heart because they felt current two-dimensional models were not accurate enough. These limitations make it harder to teach students how to perform a complicated ultrasound scan of the heart that entails guiding a probe down through the throat to the stomach. During a recent demonstration, Wright showed how a few mouse clicks allows a doctor to examine the inside or outside walls and intricate structures of the heart, which pumps about five liters of blood per minute. It took four years of tapping the expertise of dozens of doctors who each specialized on different parts of the heart. They also analyzed hundreds of previous models and enlisted a company known for its work on films to provide the technical know-how to translate the data they had gathered into a software program to power the virtual heart on screen.

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