John H. Stevens, MD, was too excited to sleep when he first heard what HeartFlow's technology could potentially do. Eight years later, he's sleeping a lot better, having secured $240 million to fund the company's commercial rollout of the HeartFlow Analysis system.

Overview: HeartFlow has built a strong financial argument for its imaging system.

Surprises: This stuff belongs on Star Trek. Very cool.

Takeaway: "There are no shortcuts."