1. A process of acquiring ultrasound and MRI data of a patient in an MRI scanner and using one of the ultrasound and MRI data to guide or improve the other, comprising: acquiring ultrasound data indicative of a changing position of a body organ relative to an MRI scanner; acquiring MRI data from the body organ substantially concurrently with the acquisition of the ultrasound data; and using one of the ultrasound data and the MRI data to automatically guide the acquisition or use of the other.