FOCUS is a free cross-platform ultrasound simulation tool that quickly and accurately calculates pressure fields generated by single transducers and phased arrays.
Download FOCUS
Version 0.332
Changes
What's new in version 0.332?
- FOCUS is now significantly faster due to optimized complex exp() code added in version 0.318.
- Transducer arrays are now indexed in 2-D rather than 1-D. See the documentation for details on this and other array-related changes.
- New apodization functions were added in version 0.299. There is now an example file to demonstrate them.
See the release notes for more details.
Features
FOCUS is simple to use for both experts and non-experts from any supported version of MATLAB.
Most software suffers very large errors in the nearfield and especially at the transducer face. The Fast Nearfield Method removes a singularity present in most methods that allows FOCUS to achieve high accuracy in this region.
Our implementation of the Fast Nearfield Method is the fastest method of ultrasound simulation that we've seen; FNM is O(n) rather than O(n2) like most methods.
Using Time-Space Decomposition, FOCUS is able to perform transient calculations very quickly and at lower sample rates for the same accuracy.
FOCUS is more accurate than most ultrasound simulation software while still maintaining its speed advantage due to the relatively small number of abscissas required by the Fast Nearfield Method.
Memory usage in FOCUS is significantly lower than in most software, especially in transient calculations due to the advantages of TSD.
Demos
Radiation Force Modeling
Analysis of computation time and accuracy of FOCUS calculations.
Waveform Diversity and 3-D Heating
Simulation of a 1,444-element spherical section array.
See more on the applications page and the examples page.
Learn More
We've compiled a number of resources you might be interested in if you want to learn more about FOCUS and the theory behind it.
Theory
- ASA Background Information
- ASA Documentation
- FNM Background Information
- Publications related to FOCUS
Software
- Applications of FOCUS
- Documentation of the MATLAB functions that make up FOCUS
- Examples distributed with FOCUS
- General FOCUS documentation; e.g. how to set up a simulation.
- Other FOCUS-related software
Download FOCUS
FOCUS is available for Linux and Windows. We compile 32- and 64-bit versions of the software for MATLAB R2006a, MATLAB R2007b, MATLAB R2008b, MATLAB R2009b, and MATLAB R2010a.
You can download FOCUS version 0.332 from the download page.