Abstract
The FOCUS software package quickly calculates transient pressure fields generated by ultrasound phased arrays. This software is useful for visualizing pressure wave propagation in the nearfield region, and the results are directly applicable to beamforming evaluations and phased array design for diagnostic and therapeutic applications. FOCUS includes support for transient pressure calculations with single transducers, including flat circular and rectangular pistons as well as spherically focused shells, and arrays of flat circular and rectangular transducers. Routines to calculate time delays for focusing the arrays are also included with the software. Transient calculations are performed with a combination of the fast nearfield method and time space decomposition, which achieves rapid convergence to reduce the numerical error while significantly reducing the computation time. Within the FOCUS software, time space decomposition is implemented with a simplified approach that decreases the overhead and reduces the computational complexity. The advantages of FOCUS over competing approaches include short computation times and small numerical errors. Examples of the supported element and array geometries will be shown, and sample codes will be provided. Transient pressure fields computed with FOCUS and with FIELD II are compared, and results show that, for the same peak error value, FOCUS is several times faster for calculations in the nearfield region.
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