Sometimes in life strange coincidences happen. For example, a few weeks ago I wrote an article on the science behind computed tomography scanners that are ubiquitous in modern hospitals. Then today there is an article in the local newspaper reporting that the hospital I was at in April has just purchased and installed a PET/CT medical imaging device. And so rather than accept this as a random coincidence, I will take it as a sign that my readers would like to know more about this imaging meth...
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