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This is an image of an image of the heart – or at least an image of heart imaging. An echocardiogram done upward or downward from between the ribs beside the sternum. It’s shortened to a “PLAX” view, if you want to banter with yer cardiogram tech. You can read how they’re done here.
The picture was done for the the Yale University School of Medicine, Center for Advanced Instructional Media, by Patrick J. Lynch, medical illustrator and C. Carl Jaffe, MD, cardiologist.