Mathematical model and a method and apparatus for utilizing the model
First Claim
1. A computer readable medium storing computer instructions for instructing computer to generate an image, the computer instruction comprising processing a mathematical model to generate an image, wherein the mathematical model comprises basis objects, each basis object being defined by a mathematical function, each basis object having a spatial relationship to all of the other basis objects, the basis objects and the spatial relationships between the basis objects defining a three-dimensional (3-D) geometry of the model, wherein the model is capable of being transformed by one or more transformation operators, each transformation operator being associated with a predetermined transformation operation, wherein when one of the transformation operators operates on one of the basis objects, the spatial relationship between the basis object that is operated on and at least one other basis object is varied, thereby causing the geometry of the model to be varied.
0 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides a model and a method and apparatus for utilizing the model to simulate an imaging scenario. The model is mathematically defined by analytical basis objects and/or polygonal basis objects. Preferably, the model is a model of the human heart and thorax. Polygonal basis objects are only used to define structures in the model that experience torsion, such as certain structures in the heart that experience torsion during the cardiac cycle. The manner in which the basis objects comprising the model are transformed by scaling, translation and rotation is defined for each basis object. In the case where a basis object experiences torsion, the rotation of the basis object will change as a function of the length along the axis of the basis object about which rotation is occurring. During an imaging system simulation, the model is utilized by a forward projection routine, which integrates the linear attenuation coefficients associated with the rays emitted by a simulated x-ray source and collected by a simulated detector array to obtain line integrals corresponding to forward projection data. The forward projection data is then processed to take into account the physics of the imaging technology, the x-ray source and the detector array. The processed projection data is then processed and back-projected by a reconstruction modeling routine to produce a reconstructed representation of the model of the heart as a function of time.
-
Citations
17 Claims
- 1. A computer readable medium storing computer instructions for instructing computer to generate an image, the computer instruction comprising processing a mathematical model to generate an image, wherein the mathematical model comprises basis objects, each basis object being defined by a mathematical function, each basis object having a spatial relationship to all of the other basis objects, the basis objects and the spatial relationships between the basis objects defining a three-dimensional (3-D) geometry of the model, wherein the model is capable of being transformed by one or more transformation operators, each transformation operator being associated with a predetermined transformation operation, wherein when one of the transformation operators operates on one of the basis objects, the spatial relationship between the basis object that is operated on and at least one other basis object is varied, thereby causing the geometry of the model to be varied.
- 10. A computer readable medium storing computer instructions for instructing computer to generate an image, the computer instruction comprising processing a mathematical model to generate an image of the human heart and thorax, wherein the mathematical model comprises basis objects, each basis object being defined by a mathematical function, each basis object having a spatial relationship to all of the other basis objects, the basis objects and the spatial relationships between the basis objects defining a three-dimensional (3-D) geometry of the model, wherein the model is capable of being transformed by one or more transformation operators, each transformation operator being associated with a predetermined transformation operation, wherein when one of the transformation operators operates on one of the basis objects, the spatial relationship between the basis object that is operated on and at least one other basis object is varied, thereby causing the geometry of the model to be varied.
Specification