An ultrasound imaging system for providing a three-dimensional image of a volume, the ultrasound imaging system comprising: a transducer array configured to provide an ultrasound receive signal; a beam former configured to control the transducer array to scan the volume along a multitude of scanning lines, and further configured to receive the ultrasound receive signal and to provide an image signal; a signal processor configured to receive the image signal and to provide image data; an image processor configured to receive the image data from the signal processor and to provide display data; a display configured to receive the display data and to provide the three-dimensional image; and a controller for controlling the beam former, wherein the controller is configured to: - receive a size of the volume and a target acquisition rate for said volume via user input, wherein the size of the volume is in the form of a lateral extent in degrees, an elevation extent in degrees and a depth expressed by a scanning time of each scanning line, - adjust the density of the scanning lines within the volume as a function of the size of the volume while maintaining the total number of scanning lines across the volume constant and the density of the scanning lines within boundary conditions set as maximum and minimum scanning line densities determined by the transducer array, and - adjust the actual size of the volume, overriding a user selection, so that the density of the scanning lines meets the boundary conditions. a transducer array configured to provide an ultrasound receive signal; a beam former configured to control the transducer array to scan the volume along a multitude of scanning lines, and further configured to receive the ultrasound receive signal and to provide an image signal; a signal processor configured to receive the image signal and to provide image data; an image processor configured to receive the image data from the signal processor and to provide display data; a display configured to receive the display data and to provide the three-dimensional image; and a controller for controlling the beam former, wherein the controller is configured to: - receive a size of the volume and a target acquisition rate for said volume via user input, wherein the size of the volume is in the form of a lateral extent in degrees, an elevation extent in degrees and a depth expressed by a scanning time of each scanning line, - adjust the density of the scanning lines within the volume as a function of the size of the volume while maintaining the total number of scanning lines across the volume constant and the density of the scanning lines within boundary conditions set as maximum and minimum scanning line densities determined by the transducer array, and - adjust the actual size of the volume, overriding a user selection, so that the density of the scanning lines meets the boundary conditions. - receive a size of the volume and a target acquisition rate for said volume via user input, wherein the size of the volume is in the form of a lateral extent in degrees, an elevation extent in degrees and a depth expressed by a scanning time of each scanning line, - adjust the density of the scanning lines within the volume as a function of the size of the volume while maintaining the total number of scanning lines across the volume constant and the density of the scanning lines within boundary conditions set as maximum and minimum scanning line densities determined by the transducer array, and - adjust the actual size of the volume, overriding a user selection, so that the density of the scanning lines meets the boundary conditions.