Hi, Im 58, 5'9", 195, have panic disorder, periodic shortness of breath, poor spirometry score, and D-Dimer of 498. My doc wants a lung CT scan to look for embolisms, but this shortness of breath has been going on for years w/little change. (Former smoker with hyperinflated lungs and granulomas on X Ray consistent with emphysema). No cough or other problems Is this CT scan for an embolism necessary, in your opinion? Or could he be looking for something else w/hyperinflated lung X Ray, low spirometry score, and relatively high D-Dimer?