US 6.3

7.1. Ultrasound Pattern

This option allows the user to define an ultrasound source defined a ultrasound pattern file (also called DUS files). A DUS file is a text file format that defines the amplitude and phase of the sound waves emitted by a source in different directions.

Please note that it is necessary to import a DUS file into the project before defining an ultrasound pattern source. In order to so, the user needs to select the "Import DUS file" option under the "Source" menu and load a DUS file. The user can create their own DUS files by using the "DUS Files" option under the "Tools" menu. Please refer to the corresponding user guide chapters for more details.

When the user selects the "Ultrasound Pattern" option, the following panel will be shown:

Ultrasound source panel

Ultrasound source panel

In the "Set ultrasound pattern file" panel, the user can select multiple DUS files (ultrasound pattern files), from the ones imported, to be used for the ultrasound source. The user can specify several ultrasound pattern files to be used for different frequency values. The table will show, for each added DUS file, the frequency of operation (editable), the filename and whether it's a 3D pattern file (3DE) or a revolution pattern file (REV).

In the "Components" panel, the user can set the amplitude factor for the emitted sound waves so that the amplitude of the resulting waves are multiplied by this factor. The user can also introduce a phase variation, in degrees, to the sound waves defined in the ultrasound pattern.

The "Position - Coords" panel allows the user to specify the location of the ultrasound source. By checking the "Pick" checkbox, the user can pick a point by clicking in the desired position in the geometry panel.

The "Orientation" panel allows the user to configure the orientation of the ultrasound source using different methods.

  • The "Director cosines" tab allows the user to explicitly provide the rotation matrix.
  • The "Spherical" tab allows to specify the rotation using the theta and phi angles from spherical coordinates, as well as a alpha rotation -- the rotation around the source's local Z-axis.
  • The "Rotation" tab allows the user to specify the angles of rotation around each axis.
  • The "Z-Axis" tab allows the user to give the coordinates of the local Z-axis vector of the source, as well as the alpha rotation -- the rotation around the source's local Z-axis.

The "Relative to reference plane" checkbox controls whether the coordinates of the created source will be relative to the local coordinate system defined by the reference plane (checked) or they will be considered with respect to the absolute coordinate system (unchecked).

 

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