It will be terrible for brain imaging. The ultrasound waves can’t go through the skull and thus can’t image the brain. Additionally you would have to drown the patient since you need a medium other than air between the ultrasound emitting probe and the body which is water in their device.

CT is more than sufficient for imaging the brain in a case of trauma and MRI is not automatically better than CT in every case.

(I am a neuroradiologist)