Dear experts :
Recently，I read a paper, Clinical application of SPHARM-PDM to quantify temporomandibular joint osteoarthritis, which was published in the Computerized Medical Imaging and Graphics in 2011. This is a brilliant paper. It gives me a lot of inspiration.
I am very interested in the SPHARM-PDM. Now I want to study the bone remodeling of the affected joint due to TMJ osteoarthropathy before and after the treatment. I think the SPHARM-PDM can help me to accurately analyze the bone remodeling of the TMJ. But I still have some questions about the analysis process of SPHARM-PDM, I hope I can get your answers or guidance. These are my questions:
When I was reading the paper mentioned above, I found that “Alignment of all surfaces was performed using rigid Procrustes alignment” was needed after the segmentation of anatomic structures and the establishment of correspondence across all surfaces. I want to ask if the alignment is necessary? What is the purpose of the alignment? What is the specific way to achieve the rigid Procrustes alignment?
I want to calculate the corresponding point distance between the two models in 3D-Slicer. Is it necessary for me to complete the registration of the models after the establishment of correspondence across all surfaces by calculation of the SPHARM-PDM, and then calculate the corresponding point distance between the models? If so, which registration should I choose?
I look forward to your reply.