Valve modeling with dense chordae from medical scan data
AssigneeSiemens Medical Solutions USA, Inc.
InventorsSasa Grbic, Tommaso Mansi, Ingmar Voigt, Julian Krebs
Life of this patent
Estimating the term…
Abstract
In valve modeling from medical scan data, chordae are modeled as a dense structure. Rather than attempting to provide the same number of chordae (e.g., 25) as found in a human valve, hundreds or thousands of chordae connectors are used. Since solving for lengths of so many chordae may be computationally intensive, the lengths of only a few are solved, and the lengths of the rest of the chordae are derived from the lengths of the few.
Claims19
A method for valve modeling from medical scan data, the method comprising:
- modeling, by a processor, a valve of a patient with a biomechanical model, which is a function of chordae lengths for a dense number of chordae relative to human anatomy comprising at least 1,000 chordae, from first medical image data representing the valve at a first time;
- inversely solving, by the processor, for values of a sub-set of the chordae lengths of the valve as a function of differences between locations of the biomechanical model simulated for a second time and second anatomy locations detected from second medical image data representing the valve at the second time;
- deriving values of the chordae lengths for chordae lengths other than the sub-set from the values of the chordae lengths for the subset;
- and
- indicating valve operation from the biomechanical model with the values of the chordae lengths for the sub-set and the others.
A non-transitory computer readable storage medium having stored therein data representing instructions executable by a programmed processor for valve modeling, the storage medium comprising instructions for:
- modeling a valve of a patient with a finite-element model, the finite-element model including at least 100 chordae in each of at least four regions of the valve with the finite-element model including nodes of a mesh for each leaflet, one of the chordae being assigned to each node of the mesh for each of the leaflets;
- inversely solving for lengths of one of the chordae in each of the at least four regions;
- and
- calculating lengths of others of the chordae in each of the at least four regions based on the regions of which the chordae are members and the corresponding lengths for the one of the chordae.
A system for valve modeling from medical scan data, the system comprising:
- an ultrasound scanner configured to scan a heart volume of a patient, the scan providing medical diagnostic ultrasound data representing at least a part of the heart;
- a processor configured to generate a model from the medical diagnostic ultrasound data with a surface mesh for leaflets, the model including chordae as connecting with each node of the surface mesh, the processor configured to solve using the model for a first chordae length in each of multiple zones and determine other chordae lengths in each of the multiple zones from the first chordae length for the respective zone;
- a display configured to generate a visualization based on the first and the other chordae lengths.
A method for valve modeling from medical scan data, the method comprising:
- modeling, by a processor, a valve of a patient with a biomechanical model, which is a function of chordae lengths for a dense number of chordae relative to human anatomy from first medical image data representing the valve at a first time;
- inversely solving, by the processor, for values of a sub-set of the chordae lengths of the valve as a function of differences between locations of the biomechanical model simulated for a second time and second anatomy locations detected from second medical image data representing the valve at the second time;
- adjusting the values for the sub-set based on a distance between a papillary tip and a vertex for the chordae at the first time, a shortest distance in a region between the papillary tip and vertices of the region, and a longest distance in the region between the papillary tip and the vertices of the region;
- deriving values of the chordae lengths for chordae lengths other than the sub-set from the adjusted values of the chordae lengths for the subset;
- and
- indicating valve operation from the biomechanical model with the values of the chordae lengths for the sub-set and the others.
Dependencies are inferred from the claim text.