1. A method of ultrasound imaging comprising: acquiring first volumetric data of a volume of interest with a probe that is a component of an ultrasound imaging system during a first cardiac cycle while the ultrasound imaging system is in a first imaging mode; displaying a first image based on all of the first volumetric data; positioning the probe using the first image; acquiring second volumetric data with the probe after said positioning the probe, where the second volumetric data is acquired for multiple cardiac cycles after the first cardiac cycle while the ultrasound imaging system is a second imaging mode that is different from the first imaging mode; acquiring second planar data of a plane through the volume of interest with the probe during the process of acquiring the second volumetric data, where the ultrasound imaging system is in the first imaging mode while acquiring the second planar data; displaying a second reference image generated from the second planar data during the process of acquiring the second volumetric data; and displaying a second image based on all of the second volumetric data.