Allan McLeod Cormack

Biography

Allan MacLeod Cormack (February 23, 1924 – May 7, 1998) was a South African-born American physicist who changed medical imaging with his work on X-ray computed tomography. Born in Johannesburg, South Africa, he attended Rondebosch Boys' High School and then the University of Cape Town, where he earned his bachelor's and master's degrees in physics. He also attended St John's College, Rondebosch. Despite not having a doctoral degree, Cormack was internationally recognized and acclaimed for his contributions to physics and medical technology.

Cormack's main contribution was his mathematical work on using X-ray projections to create images, which laid the groundwork for computed tomography scanning. As a Professor of Physics at Tufts University, he created the mathematical algorithms needed to reconstruct cross-sectional images of the human body from X-rays taken at different angles. This work, mainly done in the 1960s, provided the essential math needed for CT scanning, though others later handled the technical side.

In 1979, the importance of Cormack's work was acknowledged when he received the Nobel Prize in Physiology or Medicine, sharing it with British engineer Godfrey Hounsfield, who independently developed the first practical CT scanner. This award was notable as it was a rare case of a physicist winning the Nobel Prize in Medicine, showing the broad impact of his work. The prize recognized how his mathematical theories directly led to a medical breakthrough that transformed diagnostic medicine.

While at Tufts University, Cormack continued his physics research as his work on CT scans became widely used in hospitals around the world. He received many honors, including the National Medal of Science in 1990 and was elected a Fellow of the American Physical Society. After his death in Winchester, Massachusetts, in 1998, he continued to be honored, receiving the Gold Order of Mapungubwe posthumously in 2002, South Africa's highest honor, for his achievements as a South African-born scientist who made significant contributions to humanity.