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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. Instead, you request image data with specified resolution within a cube that might or might not match the bounding box.