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How is physics applied in biomedical sciences?

In multiple ways, really. Imaging Seeing with proper accuracy through anatomical structures like flesh, muscles and bones. Depending on your needs, you will choose a technique: Scanner (X-Rays most of the time) is used mostly to perform surgery or ascertain critical parameters, ultrasounds are used mostly to identify and grossly evaluates organs size, Medical Resonance Imaging (MRI) is mostly aimed at soft tissues visualization and so on. For all of these, companies try to propose the best of the best (almost a natural requirement in the medical/biomedical field, you dont want to see people dying or feeling sick because of a technical negligence), and improve each year. Biomechanics Designing efficient prostheses is not only critical but also in bad need today, and in mid-long term future. People are ageing, worldwide. You must know which material you are going to use: ceramics are extremely resistant and integrates really well within the body, but they are brittle (expect surgery ASAP if failure confirmed). They typically last 1020 years. Metals need to be carefully chosen. Steel or iron are obviously out of question (rust and bad osseo-integration). Titanium, titanium-alloys are often better. In any case, the prosthesis is better be light to not break surrounding bone. Metals are ductile, meaning they can deform a bit before breaking, which at least prevents fracturations and small pieces spread around. Today, a lot of prostheses combine the quality of both. But it is often really dependent on the patient (old/young, under/overweight). For all of that, Finite Elements Analyses (FEA) are often performed to evaluate stress, strain, potential plastic deformations, resistance and tolerance to fatigue. I bet you would not want a completely bended femur after 3 years of use. Neurosciences Electrodes, EMG and so on require a decent knowledge in signal processing and electrical engineering, especially when you are trying to capture on-brain data. There are a decent amount of areas yet I may have not mentioned, but so far, biomedical engineering involves you knowing either about radioactivity, electrical engineering, electromagnetism, wave propagation, mechanical engineering and Finite Element Method (FEM).

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