ViewRay (VRAY) is the developer of the MRIdian, an MRI-guided radiation therapy system that can image and treat cancer patients simultaneously. This is a promising technology, but ViewRay isn't the only one offering it.
Sweden's Elekta is offering the Unity, which is a comparable device and early indications are that it is winning more orders than the MRIdian, although not too much importance should be attached to that as it's very early days.
Given that Elekta (as well as their partner Medtronic) participated in a the December 2 financing of ViewRay worries about