Document Detail

X-ray reconstruction of moving morphology (XROMM): precision, accuracy and applications in comparative biomechanics research.
MedLine Citation:
PMID:  20095029     Owner:  NLM     Status:  MEDLINE    
X-Ray Reconstruction of Moving Morphology (XROMM) comprises a set of 3D X-ray motion analysis techniques that merge motion data from in vivo X-ray videos with skeletal morphology data from bone scans into precise and accurate animations of 3D bones moving in 3D space. XROMM methods include: (1) manual alignment (registration) of bone models to video sequences, i.e., Scientific Rotoscoping; (2) computer vision-based autoregistration of bone models to biplanar X-ray videos; and (3) marker-based registration of bone models to biplanar X-ray videos. Here, we describe a novel set of X-ray hardware, software, and workflows for marker-based XROMM. Refurbished C-arm fluoroscopes retrofitted with high-speed video cameras offer a relatively inexpensive X-ray hardware solution for comparative biomechanics research. Precision for our biplanar C-arm hardware and analysis software, measured as the standard deviation of pairwise distances between 1 mm tantalum markers embedded in rigid objects, was found to be +/-0.046 mm under optimal conditions and +/-0.084 mm under actual in vivo recording conditions. Mean error in measurement of a known distance between two beads was within the 0.01 mm fabrication tolerance of the test object, and mean absolute error was 0.037 mm. Animating 3D bone models from sets of marker positions (XROMM animation) makes it possible to study skeletal kinematics in the context of detailed bone morphology. The biplanar fluoroscopy hardware and computational methods described here should make XROMM an accessible and useful addition to the available technologies for studying the form, function, and evolution of vertebrate animals.
Elizabeth L Brainerd; David B Baier; Stephen M Gatesy; Tyson L Hedrick; Keith A Metzger; Susannah L Gilbert; Joseph J Crisco
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of experimental zoology. Part A, Ecological genetics and physiology     Volume:  313     ISSN:  1932-5231     ISO Abbreviation:  J Exp Zool A Ecol Genet Physiol     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-20     Completed Date:  2010-08-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101297745     Medline TA:  J Exp Zool A Ecol Genet Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  262-79     Citation Subset:  IM    
Department of Ecology and Evolutionary Biology, Brown University, Providence, Rhode Island 02912, USA.
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MeSH Terms
Bone and Bones / anatomy & histology*,  physiology*,  radiography
Fluoroscopy / methods
Imaging, Three-Dimensional / instrumentation,  methods*
Magnetic Resonance Imaging
Models, Anatomic
Movement / physiology*
Reproducibility of Results
Species Specificity
Swine, Miniature / anatomy & histology,  physiology*
Video Recording

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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