PhysioSonics, the Bellevue, WA-based developer of ultrasound technology for monitoring blood flow in the brain for patients with stroke or traumatic brain injury, has raised $2 million in equity out of a $4 million offering, according to a regulatory filing. The company, a University of Washington spinout, is led by CEO Brad Harlow. It raised $4 million last June from Johnson & Johnson Development Corporation. It lists Harlow, Robert Frederickson, Lauren Pflugrath, and Scott Moonly as directors.