Dr James Ambrose enthusiastically introduces the subject of EMI brain scanning, a relatively new technology when this programme was made - now referred to as computed tomography or CT scanning. He begins by describing how the EMI scanner is a far better diagnostic tool than other current methods for looking at the brain: "it requires no great stretch of the imagination to see that what we have required for a long time now is a system which would enable us to look at the structure of the brain without causing the patient fear or discomfort." For the rest of the lecture, Ambrose gives a history of the discovery of EMI scanning, practical demonstrations of the scanner and case studies leading to diagnoses. He uses scans, graphs and diagrams to illustrate his points.