title: Relative accuracy of spin-image-based registration of partial capitate bones in 4DCT of the wrist.
abstract: In image-based biomechanical analyses, registration transformations are the data of interest. In dynamic 4DCT imaging the capitate is often partially imaged. While alignment of incomplete objects poses a significant registration challenge, the established spin-image surface-matching algorithm can be utilized to align two surfaces representing disparate but overlapping portions of an object. For this reason the spin-image algorithm was chosen for the registration of partial bone geometry in 4DCT of the wrist. Registrations were performed on eleven 4DCT datasets using complete and partial capitate meshes generated by cropping complete meshes. Relative accuracy was assessed as the difference between partial- and complete-geometry registrations. Accurate registration of partial capitates geometry was achieved with 55% of the proximal capitate geometry on average, and in some cases as little as 35%. Requisite geometry depends on feature salience and imaging resolution, however the spin-image algorithm should be considered a valuable tool for biomechanists and image analysts.
authors.affiliation: Biomechanics Laboratory, Division of Orthopedic Research, Mayo Clinic, 200 First St. SW, Rochester, MN, USA, 55905.
authors.forename: Ryan
authors.initials: R
authors.lastname: Breighner
authors.affiliation: Biomedical Imaging Resource, Mayo Clinic College of Medicine, Mayo Clinic, 200 First St. SW, Rochester, MN, USA, 55905.
authors.forename: David R
authors.initials: DR
authors.lastname: Holmes
authors.affiliation: Department of Radiology, Mayo Clinic, 200 First St. SW, Rochester, MN, USA, 55905.
authors.forename: Shuai
authors.initials: S
authors.lastname: Leng
authors.affiliation: Biomechanics Laboratory, Division of Orthopedic Research, Mayo Clinic, 200 First St. SW, Rochester, MN, USA, 55905.
authors.forename: Kai-Nan
authors.initials: KN
authors.lastname: An
authors.affiliation: Department of Radiology, Mayo Clinic, 200 First St. SW, Rochester, MN, USA, 55905.
authors.forename: Cynthia
authors.initials: C
authors.lastname: McCollough
authors.affiliation: Department of Physical Medicine and Rehabilitation, Mayo Clinic, 200 First St. SW, Rochester, MN, USA, 55905.
authors.forename: Kristin
authors.initials: K
authors.lastname: Zhao