tomograph is nto 3D CT scan, also know as cone beam CT scan. Tomography refers to computerized tomography - hence the term CT. Just to make it clear so the person is not asking for tomography - as they will likely just prescribe regular computerize tomography - CT scan. Not cone beam or 3D CT. Also, none of these are necessary to correctly diagnose Eagles' syndrome. Regular MRI, with no radiotion, will provide images of calcified ligaments just as well as CT scan. But the newer version of CT scan provides much quicker, possibly more accurate way for reconstructing the imagines that can be viewed in 3D. Same thing can be done with both regular MRI and CT scan, given proper program.
I used 3Dview and it allowed me to create 3D image which clearly shows calcified ligament, however, radiologist did not pay attention to that. So you really have to have the people that are familiar with this; and of course 3D CT scan can be viewed better with more advanced technology that it comes with (ie software) which can be utilized to bring attention to particular area and analyze it in 3D.