The direct 3-D reconstruction of the heart chamber in the catheter lab provides many advantages. The clinical workflow is optimized due to the fact that the clinical information is directly available at the therapy system. In this project, the focus of the 3-D reconstruction is on the left ventricle.

Regarding the long acquisition time of the C-arm system for the acquisition of the projection images (> 5s), the heart motion has to be considered. In the field of 3-D/4-D reconstruction of coronary arteries, an approach was developed estimating the heart motion from the projection images and compensating the motion in the reconstruction of the volumetric data. This technique is working on sparse data and cannot be applied to the heart chamber reconstruction.

In general, the project comprehends the development of new techniques for 3-D/4-D reconstruction of non-sparse objects.

The analysis can be classified into the following working fields:

• Analysis and development of algorithms for motion estimation and motion compensating reconstruction algorithms.

• Analysis and development of optimized acquisition and contrast protocols.

• Analysis and development of a mathematical 4-D heart model for quantitative evaluation.

• Analysis and development of models to describe the heart wall motion.

• Analysis and development of surface models.