Typecast Quad16 to Quaternion

How can I typecast from Quad16 to Quaternion? Is there a helper function somewhere?

Would the following be correct?

Quat16 q16 = renderComponent.Shape.NodeRotations[0];
Quaternion q = Quaternion.Normalize(new Quaternion(q1.X, q1.Y, q1.Z, q1.W));