Representation of deformable motion for compression of dynamic cardiac image data

Andreas Weinlich; Peter Amon; Andreas Hutter; André Kaup

doi:10.1117/12.911276

14 February 2012 Representation of deformable motion for compression of dynamic cardiac image data

Andreas Weinlich, Peter Amon, Andreas Hutter, André Kaup

Proceedings Volume 8314, Medical Imaging 2012: Image Processing; 83140E (2012) https://doi.org/10.1117/12.911276
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

Abstract

We present a new approach for efficient estimation and storage of tissue deformation in dynamic medical image data like 3-D+t computed tomography reconstructions of human heart acquisitions. Tissue deformation between two points in time can be described by means of a displacement vector field indicating for each voxel of a slice, from which position in the previous slice at a fixed position in the third dimension it has moved to this position. Our deformation model represents the motion in a compact manner using a down-sampled potential function of the displacement vector field. This function is obtained by a Gauss-Newton minimization of the estimation error image, i. e., the difference between the current and the deformed previous slice. For lossless or lossy compression of volume slices, the potential function and the error image can afterwards be coded separately. By assuming deformations instead of translational motion, a subsequent coding algorithm using this method will achieve better compression ratios for medical volume data than with conventional block-based motion compensation known from video coding. Due to the smooth prediction without block artifacts, particularly whole-image transforms like wavelet decomposition as well as intra-slice prediction methods can benefit from this approach. We show that with discrete cosine as well as with Karhunen-Lo`eve transform the method can achieve a better energy compaction of the error image than block-based motion compensation while reaching approximately the same prediction error energy.

Citation Download Citation

Andreas Weinlich, Peter Amon, Andreas Hutter, and André Kaup "Representation of deformable motion for compression of dynamic cardiac image data", Proc. SPIE 8314, Medical Imaging 2012: Image Processing, 83140E (14 February 2012); https://doi.org/10.1117/12.911276

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