1. An ultrasound imaging system, comprising: a transmit transducer array for insonifying selected object and/or area of living tissue with a directional ultrasound pulse; at least one receive transducer for detecting and recording ultrasound echo returns, wherein said transducer is relatively non-directional in the plane of scan; a computer in electronic communication with said transmit transducer array and said receiver transducers, said computer having hardware and software for digitizing and storing each ultrasound echo in a line of computer memory, determining the location of said transmit transducer in relation to said receiver transducer(s), reconstructing scan lines as lines on a reconstructed image based on the determination of the location of the receive transducer relative to that of the transmit transducer and the average speed of ultrasound in the tissue object, and image processing to fill in gaps between scan lines and optionally correct distortions caused by the point spread function of the system.