In this paper

3D pulse-echo imaging with limited diffraction array beams is presented. Because only one transmission is required to construct 3D images

and the entire transducer aperture is used and both the transmission and reception beams do not diverge over a large depth of interest. The images obtained with limited diffraction array beams have a higher SNR and high frame rate compared to images obtained with conventional focused beams. Data acquired is transformed into spatial scattered data by normalizing. A new algorithm of surface construction is proposed. An assistant surface is constructed on the base of boundary that being automatically extracted from the scattered data. In the aggregate of rectangle fields of data

the assistant surface is modified to get the final surface by a piecewise bicubic Hermite interpolation. In the experiment

computer simulation of the imaging method with limited diffraction array beams has been carried out. A plane wave is used. At the same time

a single surface is reconstructed with the new reconstruction method described in this paper. However

to confirm validity a sphere and a face data acquired by laser are used to reconstruct. Results show that the algorithm has run short time

good fairness

without triangulation.