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New to image registration and ITK, I’m following the ITK software guide and trying to understand the different outputs. I’m focusing on the example ImageRegistration8.cxx: a rigid transform in 3D, and the example is detailed in the Software guide Book2, section 3.6.4.<br><br>The manual explains that the versor (page 211)<br><br>• Versor=(−6.03744e−05,5.91487e−06,−0.0871932)<br><br>is equivalent to a rotation of 9.98 degrees around the Z axis. <br><br>I understand a versor is a unit quarterion, and have been trying to convert this versor to the ~10 degrees angle (in the z direction) using the equations in wikipedia. I read the slides on Quarterions found at <a href="http://www.itk.org/CourseWare/Training/QuaternionsI.pdf">http://www.itk.org/CourseWare/Training/QuaternionsI.pdf</a>, among other sources, but I still cannot resolve my question.<div><br></div><div><div>I appreciate any help and advice.<br><br></div><div>Thank you!</div><div>Marina</div><div><br></div></div></div>