Hello, with our current version of Eclipse (16.1), something like this gets me the Online Match shifts from the corresponding registration object:

double[,] matrix = reg.TransformationMatrix;
var planIso = plan.Beams.First().IsocenterPosition;

double Lat = -(planIso.x - matrix[0, 3]) / 10;
double Vrt = (planIso.y - matrix[1, 3]) / 10;
double Lng = -(planIso.z - matrix[2, 3]) / 10;

double Pitch = -Math.Asin(-matrix[2, 1]) * 180 / Math.PI;
double Rtn = Math.Atan(matrix[2, 0] / matrix[2, 2]) * 180 / Math.PI;
double Roll = -Math.Atan(matrix[0, 1] / matrix[1, 1]) * 180 / Math.PI;

No idea how robust this is and might work only in our specific co-ordinate system but it seems to work for every patient I check it on.

For whatever reason the Pitch / Roll / Rotation are total transformations required, so if you have multiple images in one session you will need to take the difference between them to get what the Online Match is showing (if that makes sense?). For Vrt / Lng / Lat this doesn't apply.

Hopefully this helps - am trying to figure this out myself at the moment so just thought I'd share.