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This lecture from The Royal Institution's 1975 Christmas Lectures series features Professor Heinz Wolff exploring the fascinating ways electromagnetic radiation and ultrasound allow medical professionals to see inside the human body without surgery. Discover how X-rays, gamma rays, infrared radiation, and ultrasound penetrate tissue and bone to create different types of diagnostic images. Learn about the revolutionary developments in medical imaging technology, including computer-assisted X-ray scanning that dramatically improved image quality. The 59-minute presentation, recorded on January 1, 1976, is part of the "Signals from the Interior" series that investigates non-invasive methods of examining internal body structures. Understand how different imaging techniques work by detecting various physical properties of body tissues, creating "windows" into the human body that transformed medical diagnosis.
