Abstract
The goal of this work is to accurately and reliably localize anatomical landmarks in 3D Computed Tomography (CT) scans of the upper bodies of cancer patients even in the presence of pathologies and imaging artifacts that may markedly change the appearances of anatomical structures. We propose a method based on dense matching of parts-based graphical models. For landmark localization, we replace population averaged models by personalized models that are adapted to each test image at runtime. We do so by jointly leveraging weighted combinations of labeled training exemplars. We report results for localizing standard anatomical landmarks in clinical 3D CT volumes, using a database of 83 lung cancer patients. We compare our method against both (baseline) population averaged graphical models and against atlas-based deformable registration and show the method is in each case able to localize landmarks with significantly improved reliability and accuracy.
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Population mean and personalized spatial priors have the same meaning as the maximum spatial prior distribution defined in Sect. 2.5. We use the shorter names for clarity.
This is achieved in the algorithm by a linear interpolation of the intensity values in both the reference and the test volume between \(-\)750 HU and 1750 HU.
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Acknowledgments
We are grateful to Dr. Jean-Marc Peyrat (Siemens) for refining the manuscript, Prof. Daniel Slosman (Clinique Générale-Beaulieu, Geneva, Switzerland) and Dr. Jérôme Declerck (Siemens) for image database, and to Mr. Tomas Potesil for help with data annotation.
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Communicated by K. Ikeuchi.
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Potesil, V., Kadir, T., Platsch, G. et al. Personalized Graphical Models for Anatomical Landmark Localization in Whole-Body Medical Images. Int J Comput Vis 111, 29–49 (2015). https://doi.org/10.1007/s11263-014-0731-7
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DOI: https://doi.org/10.1007/s11263-014-0731-7