By using a rotating mirror, a high-speed camera and correcting for geometric changes, PIV can be performed nearly instantly on a set of planes throughout the flow field.  Fluid properties between the planes can then be interpolated.  Thus, a quasi-volumetric analysis can be performed on a target volume.  Scanning PIV can be performed in conjunction with the other 2-dimensional PIV methods described to approximate a 3-dimensional volumetric analysis.