This patent application is assigned to The
The following quote was obtained by the news editors from the background information supplied by the inventors: "In recent years, simulation of biological systems has been attracting attention. As an example of simulation of biological systems, simulation of the motion of organs such as the heart is often performed. In this case, a model of the organ is generated as input data. For simulating an organ of an individual patient, a model conforming to the shape of the organ of the patient is generated. However, since it is difficult to directly view the organ of the patient, the shape of the organ is determined from tomographic images of the organ, for example. Then, a three-dimensional (3D) model is generated on the basis of the determined shape. For instance, a 3D template deformation method has been disclosed that facilitates generation of a 3D shape model of the heart of a patient and blood vessels around the heart (see, for example, Japanese Laid-open Patent Publication No. 2011-200549).
"However, it is difficult to accurately reproduce the shape of an organ as a 3D model from tomographic images of the organ.
"For example, it is assumed that a 3D model of the heart of a patient is generated by deforming a 3D model which is prepared as a template of the shape of the heart. In this case, in a first deformation process, the position of a valve annulus (the frame of a valve) in the template is adjusted to match the shape of the heart. The first deformation process greatly affects the subsequent deformation process, and therefore needs to be performed accurately. According to a conventional method, in the case of matching the position of a valve annulus in the template to the shape of the heart of a patient, points are manually set in the template so as to correspond to respective points on a valve annulus in tomographic images of the heart. Then, the template is deformed such that the points in the template match the corresponding points on the valve annulus in the tomographic images. However, since the points in the template corresponding to the points on the valve annulus in the tomographic images are set manually, the relative positional relationship between, for example, valve annuli might be inconsistent in three dimensions, and therefore the deformed model might be distorted."
In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "According to one aspect of the invention, there is provided a computer-readable storage medium storing a computer program which causes a computer to perform a procedure including: setting a first point on a first part represented in a plurality of tomographic images of an organ; determining a relative position of the first point with respect to a reference position of the first part represented in the plurality of tomographic images and a reference position of a second part represented in the plurality of tomographic images; setting a second point in association with the first point, on a first part in a 3D model representing a structure of the organ, such that a relative position of the second point with respect to a reference position of the first part in the 3D model and a reference position of a second part in the 3D model matches the relative position of the first point; and deforming the 3D model such that, when the plurality of tomographic images and the 3D model are placed in a same coordinate system, a position of the second point matches a position of the first point corresponding to the second point.
"The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims.
"It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention.
BRIEF DESCRIPTION OF DRAWINGS
"FIG. 1 illustrates an exemplary functional configuration of a model generation apparatus according to a first embodiment;
"FIG. 2 illustrates an exemplary hardware configuration of a computer used in the first embodiment;
"FIG. 3 is a functional block diagram of a computer according to a second embodiment;
"FIG. 4 illustrates exemplary tomographic images of the heart;
"FIG. 5 illustrates an exemplary data structure in a template storage unit;
"FIG. 6 illustrates an exemplary data structure in an annulus data storage unit;
"FIG. 7 illustrates an exemplary structure of landmark data;
"FIG. 8 is a flowchart illustrating an exemplary procedure of a 3D model generation process;
"FIG. 9 is an enlarged view illustrating annuli in a tomographic image;
"FIG. 10 is a flowchart illustrating an exemplary procedure of an annulus specifying process;
"FIG. 11 illustrates exemplary line data of annuli based on target landmarks;
"FIG. 12 illustrates an example of setting a start point of source landmarks;
"FIG. 13 illustrates the relationship of the distance ratio between landmarks;
"FIG. 14 is a flowchart illustrating an exemplary procedure of a landmark associating process;
"FIG. 15 illustrates exemplary source landmarks that are set in association with target landmarks;
"FIG. 16 illustrates an example of a deformation process based on landmarks;
"FIG. 17 illustrates an example of deforming a template model based on landmarks;
"FIG. 18 illustrates an example of an annulus fitting method based on a tomographic image;
"FIG. 19 is a flowchart illustrating an exemplary procedure of a template deformation process;
"FIG. 20 illustrates an example of deforming an annulus by a fitting process; and
"FIG. 21 illustrates an exemplary result of a fitting process using equations of a comparative example."
URL and more information on this patent application, see: NAKAGAWA, Machiko; HISADA, Toshiaki; SUGIURA,
Keywords for this news article include: Information Technology, The
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