A method of constructing an ultrasound image, comprising: transmitting an omni-directional unfocused ultrasound waveform approximating a first point source within a transmit aperture (202,502) on a first array through a target region; receiving ultrasound echoes from the target region with first and second receiving elements (R R 1 to R R m) disposed on a first receive aperture (204,304) on a second array, the second array being physically separated from the first array; determining a first time for the waveform to propagate from the first point source to a first pixel location in the target region to the first receiving element, and determining a second time for the waveform to propagate from the first point source to the first pixel location in the target region to the second receiving element; forming a first ultrasound image of the first pixel by coherently combining the echo received by the first receiving element at the first time with the echo received by the second receiving element at the second time; receiving ultrasound echoes from the target region with third and fourth receiving elements (R R 1 to R R m) disposed on a second receive aperture (206,506) on a third array, the third array being physically separated from the first and second arrays; determining a third time for the waveform to propagate from the first point source to the first pixel location in the target region to the third receiving element, and determining a fourth time for the waveform to propagate from the first point source to the first pixel location in the target region to the fourth receiving element; forming a second ultrasound image of the first pixel by coherently combining the echo received by the third receiving element at the third time with the echo received by the fourth receiving element at the fourth time; and incoherently combining the first ultrasound image and the second ultrasound image. transmitting an omni-directional unfocused ultrasound waveform approximating a first point source within a transmit aperture (202,502) on a first array through a target region; receiving ultrasound echoes from the target region with first and second receiving elements (R R 1 to R R m) disposed on a first receive aperture (204,304) on a second array, the second array being physically separated from the first array; determining a first time for the waveform to propagate from the first point source to a first pixel location in the target region to the first receiving element, and determining a second time for the waveform to propagate from the first point source to the first pixel location in the target region to the second receiving element; forming a first ultrasound image of the first pixel by coherently combining the echo received by the first receiving element at the first time with the echo received by the second receiving element at the second time; receiving ultrasound echoes from the target region with third and fourth receiving elements (R R 1 to R R m) disposed on a second receive aperture (206,506) on a third array, the third array being physically separated from the first and second arrays; determining a third time for the waveform to propagate from the first point source to the first pixel location in the target region to the third receiving element, and determining a fourth time for the waveform to propagate from the first point source to the first pixel location in the target region to the fourth receiving element; forming a second ultrasound image of the first pixel by coherently combining the echo received by the third receiving element at the third time with the echo received by the fourth receiving element at the fourth time; and incoherently combining the first ultrasound image and the second ultrasound image.