If a doctor suspects you may have a pulmonary embolism (PE), a CT scan is the gold standard of imaging techniques. This painless scan uses intravenous (IV) contrast, a type of dye, to help the doctor ...

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 ...