The first item on the menu allows you to access Stradx's advanced image registration facilites. With a position sensor, these facilities correct for errors in the position readings and compensate for variations in the contact pressure between the ultrasound probe and the subject's skin. For high resolution B-scans (15 to 25MHz), this correction is necessary in order to generate clear and accurate 3D reconstructions. Image registration will also improve 3D reconstructions of lower resolution B-scans, and correct misalignments between sweeps in multi-sweep data sets. If you're not using a position sensor, you can use these facilites to estimate the relative locations of the B-scans directly from the B-scan images themselves.
The second item on the menu allows you to align the 3D ultrasound volume with a reference coordinate system using fiducial points. The re-aligned volume can then be saved as a regular voxel array. This is useful for multimodal registation studies.
The third item on the menu allows you to register the scans to the patient's body. This means that when you subsequently visualise the 3D data set, you can see the locations of the scans superimposed on a model of a human body. This removes any ambiguity as to precisely where the scans came from.
The final menu item allows you to use a tracked pointer to record landmarks directly, which are then displayed in both the outline window and the measurements window. The calibration of the pointer, and the recording of landmarks, are all handled using the mouse buttons, in similar fashion to the MouseRecord window.