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May 12, 2014: A new version 3.24 of Field II for widows has been released for Matlab 8.10. This mex file is compiled using the GNU gcc compiler and should hopefully fix the problem with Field II under windows. You can find the code at: Download/For Matlab 8.20 in the left menu.

May 12, 2014: A new version 3.24 of Field II has been released for Matlab 8.20. The version fixes a problem for short spatial impulse responses using rectangles. Try it out, and report problems to me.

May 5, 2014: The Field IIpro parallel version has now been released for use. It is found in versions for both Matlab and Octave and it also exist in a C library version usable for buidling stand-alone executables. More information about the program can be found at: Field IIpro in the left menu.

October 27, 2013: Field II can be slow for certain field points, when using bounding lines and triangles. This is due to the method employed for integrating the response. The option set_field('fast_integration',1) solves this problem, with a very slight reduction in accuracy. I have therefore chosen to make this option the default method. It can be disabled by writing set_field('fast_integration',0). Field II version 3.22 has therefore been compiled for version 8.10 of Matlab for Windows, Mac and Linux. Please download if from Matlab 8.10, try it out, and report problems to me.

Note also that for the Windows 64 bits version you have to have the Microsoft Visual Studio 2012 run-time libraries for this version to work. This you can either get by installing the compiler and using mex -setup or download the Microsoft Visual Studio 2012 run-time libraries from the link: http://www.microsoft.com/en-us/download/details.aspx?id=30679

October 19, 2013: An internal error in the program when using triangles has been fixed in Field II version 3.21 compiled for version 8.10 of Matlab for Windows, Mac and Linux. Please download if from Matlab 8.10, try it out, and report problems to me.

September 30, 2013:You can now follow Field II on LinkedIn and post comments and discussions. You can freely join the group named: Field II Ultrasound Simulation Program, where news about new version of Field II will be posted.

September 25, 2013: Field II has now been compiled for version 8.10 of Matlab for Windows, Mac and Linux. Please download if from Matlab 8.10, try it out, and report problems to me. Work is also underway for a faster version of Field II. More on this in October.

June 11, 2012: A version new example of more efficient calculation of a flow signal for multi-cpu simulation has been added. It can be found under flow examples here.

April 30, 2012: This is the new web-site for Field II. The University is closing the Linux server hosting the Field II web-site. I have therefore decided to host my own site at field-ii.dk, which will remain open for a s long as there is any interest in Field II. I hope to add new, updated versions soon.

June 9, 2011: A version for the Mac (64 bits, Intel) have been made and put on the web. It can be found under Download.

May 6, 2011: The distribution files have been updated May 6, 2011. They now include the users guide and a small bug fix has been made for m-file xdc_apodization.

November 19, 2010: The memory problem under Matlab has now been fixed and a new version for Matlab 7.10 has been put on the web under Download. Please use this version from now on.

June 30, 2009: There is problems with Matlab version 7.8 and the 7.6 code. A new 64 bits version for Linux and Matlab 7.8 has been made, and can be found at: ?downloading_7_8.html . More versions will be added once they are compiled.

January 22, 2008: Version 3.16 of the Field II program for has been put on the web for the Intel Mac. The version runs under Matlab version 7.5.

The web-site for Field II is now placed at:

http://server.oersted.dtu.dk/personal/jaj/field/

due to our 5-year cycle of changing Department name.

December 17, 2007: Version 3.16 of the Field II program for has been put on the web in a 64 bits version for both Windows and Linux. The version runs under version 7.5 in Windows and 7.4 in Linux.

August 10, 2007: Version 3.15 of the Field II program for has been put on the web. The version fixes print-out under the Java front-end and an error in the splash screen. Program is also converted to Matlab 7 and automatic release of memory has been added.

A new web-site for Field II has been introduced. It is now placed at: http://server.oersted.dtu.dk/personal/jaj/field/.

http://server.oersted.dtu.dk/personal/jaj/field/

The examples on the web site have been updated and some errors fixed.

September 12, 2003: Version 3.00 of the Field II program for Mac OS X has been put on the web. The version can be found under the distribution as a compressed tar file or as a mex file under the m-files directory.

April 19, 2002: Version 3.00 of the Field II program has been released today. The program includes a number of improvements and enhancements, along with specific versions for Matlab 6 under windows and Linux. The new features are:

  1. The internal memory managnement in the program is now done through Matlab and the internal calling in the program is now done through the Matlab version 5 and 6 interface specification. The program can, therefore, only be used with Matlab 5 and 6. Older versions of the program can still be found on the web-page: downloading_17_8_2001.html. This should hopefully solve some problems with crashes under Windows.
  2. The precision of the calculation with rectangles has been increased. The program now uses half sampling intervals alignment in the calculation to increase accuracy.
  3. A problem with double curved transducer surfaces have been solved when using rectangular elements. This influences the transducer models xdc_concave and convex elevation focused arrays.
  4. The command field_info has been made, which shows the state of all parameters in the program.
  5. A few more options has been added to the routine set_field.
  6. Several problems with calculating fields from boundary line elements has been fixed. Problems for triangular elements have also been fixed.

August 21, 2001: A new web-site for the Field II programs has been made. It contains a new interface, which should make it quicker to navigate and find information. The new web-site can be found at:

http://www.es.oersted.dtu.dk/staff/jaj/field/

The old web-site, that no longer be maintained, can be found at:

http://www.es.oersted.dtu.dk/staff/jaj/old_field/

A new fully hypelinked user guide has been made for version 2.86 of the program. It can be found at: information/users_guide.pdf

Several features have been added to version 2.86 (August 17, 2001) of the program:
  1. The writing of time left for the calculation no longer scrolls, so that only one line is displayed. The time is now also displayed in a more detailed time format.
  2. A procedure for making full synthetic aperture imaging has been added to the program (calc_scat_all). It calculates the signal for all receiving elements, for each of the elements in the transmitting aperture.

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Last updated: 1:42 on Sat, 24-May-2014