Abstract
Methods to estimate respiratory organ motion can be divided into two groups: biophysical modeling and image registration. In image registration, motion fields are directly extracted from 4D (\(=3\mathrm {D}+\mathrm {t}\)) image sequences, often without concerning knowledge about anatomy and physiology in detail. In contrast, biophysical approaches aim at identification of anatomical and physiological aspects of breathing dynamics that are to be modeled. In the context of radiation therapy, biophysical modeling of respiratory organ motion commonly refers to the framework of continuum mechanics and elasticity theory, respectively. Underlying ideas and corresponding boundary value problems of those approaches are described in this chapter, along with a brief comparison to image registration-based motion field estimation.
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- 1.
Please note that the following explicit definition of the specific tensors aims at a complete description of current model formulations. Further, the tensors offer starting points for a detailed analysis of estimated motion fields from a biophysical perspective; related aspects will be demonstrated in Sect. 3.4. The definition could, however, deter readers not familiar with continuum mechanics. These could skip the next passages and continue reading with, e.g., the description of the constitutive equations or boundary conditions without loosing the central thread of the chapter.
- 2.
Young’s modulus is often also denoted by \(E\), which in the current case would lead to confusion when referring to the Green-St. Venant strain tensor.
- 3.
Altair Engineering, http://www.altair.com.
- 4.
Dassault Systemes Simulia Corp., http://www.simulia.com.
- 5.
- 6.
Comsol AB, http://www.comsol.com.
- 7.
Ansys inc., http://www.ansys.com.
- 8.
Kitware, http://www.itk.org.
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Werner, R. (2013). Biophysical Modeling of Respiratory Organ Motion. In: Ehrhardt, J., Lorenz, C. (eds) 4D Modeling and Estimation of Respiratory Motion for Radiation Therapy. Biological and Medical Physics, Biomedical Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36441-9_4
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