https://apnews.com/78129e884de845a59a0074f4f3234bec

SPRINGFIELD, Mass. (AP) — Sometimes, Dr. Rose Ganim, chief of thoracic surgery at Baystate Medical Center in Springfield, lies awake at night contemplating the best approach for a complex operation.

When it comes to surgery, Ganim said, good planning can be the difference between life and death. And that makes getting an accurate picture of what's going on beforehand imperative.