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MEDICINE AND PHYSICS

Modern medicine has become highly quantitative and its science base increasingly relevant and germane to medical advances. Chemistry has for a long while been the scientific underpinning of the theory and practice of clinical medicine, but physics has been gradually edging its way into this area, and nowadays it represents a very significant feed into medical practice, both in diagnostics and in treatment. Computed Tomography (CT scanning) is now the routine tool for obtaining images of otherwise inaccessible damaged or diseased tissue, and conveys a wealth of information to clinicians. And where the tissue concerned is too delicate to be exposed to the x-rays used in CT scanning, magnetic resonance imaging (MRI) can be deployed instead. The physics of MRI imaging is strictly 20th century and modern – the core of it is the highly anathematized discipline of quantum mechanics. The role of CT and MRI imaging is essentially diagnostic, but there are also tools from physics available for treatment, such as various forms of ionizing radiation used to destroy cancers as well as lasers where pinpoint accuracy is required, as in laser eye treatment to treat retinopathy. The doctors who operate in this area are well aware of the need for and importance of a quantitative understanding of their tools, and are usually up to speed with such matters as the appropriate milliwattage to use, the appropriate exposure times and the joule energy deployed when lasers are being used to treat very delicate and sensitive tissue. Chemistry has long been an essential pre-requisite for entry to medical school, but now I think there is a strong case for making physics compulsory.