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The 2D/3D image geometry description matches C.8.X.2.1.2 'Transducer Frame of Reference' in DICOM Enhanced Ultrasound (sup 43). All units are in meter [m] with orthogonal axes forming a right-handed coordinate system. Coordinates are relative to the tip of the transducer, with origin at the center of the aperture. The X-axis follow the 1st aperture axis, and the Y-axis point into the imaged body.
The Z-axis follows from the right-hand rule.
It's possible to retrieve the bounding box of the image geometry. You'll then get a top left/right coordinate together with orthogonal directional vectors that span a rectangle or cube covering the entire image sector as shown in the figure below:
The underlying "rawdata" samples are not accessible through Image3dAPI. This means that you cannot query for the number of beams, the beam angles nor the number of samples per beam.