1. A handheld medical ultrasound imaging device comprising: a transducer probe housing a transducer array; and a tablet housing powered by a battery, the housing having a front panel, a computer in the tablet housing, the computer including at least one processor and at least one memory, a touch screen display that displays an ultrasound image and a graphical user interface having a plurality of touch actuated icons, the touch screen display positioned on the front panel, and an ultrasound beamformer processing circuit disposed in the tablet housing that receives image signals from the transducer array, the touch screen display and the ultrasound beamformer processing circuit being communicably connected to the computer, the computer being configured to respond to a first input from the touch screen display to alter an operation of the ultrasound beamformer processing circuit to display an ultrasound image, a second input from the touch screen display actuating a needle guide operation such that a needle can be visualized with an image on the touch screen display, a third input from the touch screen display that actuates an imaging depth control adjustment with a touch gesture, and a fourth input from the touch screen display that actuates split screen viewing of the ultrasound image and a second diagnostic image on the touch screen display.