High frequency ultrasound with linear array transducers provide up to 1000 frames per second and possible resolution down to 30 microns. The VSI 2100 provides the ability to do both power Doppler and color Doppler, B and M mode ultrasound and 3D image acquisition. We have 2 transducers, the MS250 for large tumors and abdominal ultrasounds (75 micron axial resolution) and the MS550D for small tumors, vascular imaging and embryology (40 micron axial resolution)