Shares of Mountain View, Calif.-based Heartflow Inc. have oscillated significantly over the past three months, but the results of a study of the company’s plaque staging system have breathed new life into the company’s shares, boosting them by 7% in Nov. 10 trading.

Artificial intelligence still has a lot to prove when it comes to its relevance in improving health care. But one bright spot was a deal last July between Dublin-based Medtronic plc and San Francisco-based startup Viz.ai Inc. to use the latter’s AI system that’s designed to spot a large vessel occlusion automatically in CT angiogram images.