Investors are backing imaging diagnostics company Magnetic Insight Inc. with $17 million to develop its magnetic particle imaging (MPI) technology. The clinical imaging application consists of two core technologies: hardware and a tracer that, together, produce 3D images of how a patient’s body works. Venture firm Celesta Capital led the series B round with Alumni Ventures Group, Gaingels and existing investors 5AM Ventures and Sand Hill Angels participating.