The discussion focuses on the physical principles behind Computed Tomography (CT), explaining that it involves taking a series of one-dimensional X-rays from various angles around a subject. The process includes dividing the body into multiple sections, or "boxes," and calculating the density for each section to match the total absorption measured by the X-rays. This calculation typically involves matrix inversion techniques. A reference to further reading on the topic is provided, specifically noting that some information, particularly regarding safety, may be controversial.