The FDA's Center for Devices and Radiological Health is conducting market research to identify potential sources that can supply a complete 3D Particle Tracking Velocimetry (PTV) system, including both hardware and software, for research supporting non-clinical performance testing of Fractional Flow Reserve (FFR) software devices. The system must be commercial off-the-shelf equipment requiring no installation or training. Under the preferred Integrated System approach, all offered components must be fully compatible with specified Government-Furnished Equipment, including a LaVision camera, timing unit, lasers, and DaVis software. This is a sources sought notice for market research purposes only, not a solicitation.