Radiology outsourcing firm Radisphere National Radiology Group has raised $27.5 million in a Series C investment round.

Midwest health care start-ups attracted $780 million in investments in 2009, according to the BioEnterprise Midwest Health Care Venture Investment Report. While the number of companies winning investments last year — 156 — was about the same as in 2008, the dollar volume of the investments dropped 26 percent.

The market for teleradiology continues to grow, and Franklin & Seidelmann has expanded into new markets, as well. Earlier this year, it added three Critical Access Hospitals — far-flung facilities in mountainous areas that provide acute care — in Pennsylvania, Kentucky and Idaho. At the end of 2008 it announced expanded services that included final reads of scans for night-time emergency departments.