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BILDMED
2009

Estimation of Inner Lung Motion Fields by Non-linear Registration

13 years 4 months ago
Estimation of Inner Lung Motion Fields by Non-linear Registration
Abstract. Detailed analysis of breathing dynamics, as motivated by radiotherapy of lung tumors, requires accurate estimates of inner lung motion fields. We present an evaluation and comparison study of non-linear non-parametric intensity-based registration approaches to estimate these motion fields in 4D CT images. In order to cope with discontinuities in pleura and chest wall motion we restrict the registration by applying lung segmentation masks and evaluate the impact of masking on registration accuracy. Furthermore, we compare diffusive to elastic regularization and diffeomorphic to non-diffeomorphic implementations. Based on a data set of 10 patients we show that masking improves registration accuracy significantly. Moreover, neither elastic or diffusive regularization nor diffeomorphic versus non-diffeomorphic implementation influence the accuracy significantly. Thus, the method of choice depends on the application and requirements on motion field characteristics.
René Werner, Jan Ehrhardt, Alexander Schmid
Added 08 Nov 2010
Updated 08 Nov 2010
Type Conference
Year 2009
Where BILDMED
Authors René Werner, Jan Ehrhardt, Alexander Schmidt-Richberg, Florian Cremers, Heinz Handels
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