A radiologist and public health expert breaks down what we know about President Trump's CT scan, and what this means for his ...

Each year, the US performs more than 93 million computed tomography (CT) scans, many of which offer limited clinical value. For patients with mild head injuries, CT scans are often ordered reflexively ...

give doctors a clear idea of what's going on inside our bodies. As patients, we should follow their lead. We ought to have a clear picture, too, of what a scan can and can't do -- before we undergo it ...