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Researchers said the findings may one day help some patients with stable chest pain avoid invasive coronary angiography.

If the heart has signs of damage, the next step is to pursue invasive angiography.

In the hospital’s angiography suite, a neuroradiologist, guided by X-ray imaging, pierced Walterson’s femoral artery at the top of his inner thigh and threaded a microcatheter through his body, northbound to the brain.

I waited 30 minutes for my insurance to approve a CT angiography, for which technicians would inject dye into my veins to produce pictures of my heart and the blood vessels in my lungs.

But here’s the catch: From the time CT pulmonary angiography was first used about 30 years ago, we have dramatically increased the number of patients in whom we look for and diagnose PE.