High precision quasi 3-D quantitative reconstruction of sound velocity image from the transmitted data around a single rotational axis

A quasi 3-D technique was presented to reconstruct sound velocity slices of the object, from the data by transmitting and receiving acoustic waves over the cylindrical aperture around a single rotational axis. To comply with the problem, backward propagation Rytov approximation, spatial filter processing in a perpendicular direction, deviation correction of the 1st-order Rytov approximation was introduced. As a result of the test examination by means of the simulation for a sphere object, it was verified that a sound velocity quantitative CT image with by far higher accuracy than the conventional one could be brought to realization under the practical condition of the sound velocity variation (±10%) and observation distance. The results obtained are promising for actual clinical applications such as the human breast cancer screening test