1. A method of ultrasound imaging comprising: acquiring volumetric data of a volume of interest with an ultrasound imaging system; acquiring planar data with the ultrasound imaging system during the process of acquiring the volumetric data, the planar data comprising data of a plane through the volume of interest; displaying a reference image based on the planar data during the process of acquiring the volumetric data; and displaying an image based on the volumetric data.