TECHNIQUE FOR PRESUMING POSITIONS OF ORGANS

• US 20150193930A1
• Filed: 12/24/2014
• Published: 07/09/2015
• Est. Priority Date: 01/09/2014
• Status: Active Grant

• Current Assignee: Fujitsu Limited, University of Tokyo
• Original Assignee: Fujitsu Limited, University of Tokyo
• Inventors: NAKAGAWA, Machiko, HISADA, Toshiaki, SUGIURA, Seiryo, WASHIO, Takumi, OKADA, Jun-ichi
• Granted Patent: US 9,495,610 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 18/22 Matching criteria, e.g. proximity measures
• CPC Class Codes: G06T 2207/10081 Computed x-ray tomography [CT]
• CPC Class Codes: G06T 2207/10088 Magnetic resonance imaging [MRI]
• CPC Class Codes: G06T 2207/30008 Bone
• CPC Class Codes: G06T 2207/30012 Spine; Backbone
• CPC Class Codes: G06T 2207/30061 Lung
• CPC Class Codes: G06T 7/0012 Biomedical image inspection
• CPC Class Codes: G06T 7/11 Region-based segmentation
• CPC Class Codes: G06T 7/155 involving morphological operators
• CPC Class Codes: G06T 7/62 of area, perimeter, diameter or volume
• CPC Class Codes: G06T 7/75 involving models
• CPC Class Codes: G06V 20/64 Three-dimensional objects

Abstract

An apparatus for presuming positions of organs is configured to transform plural organs included in a template that is a model including the plural organs so as to match a predetermined target organ among the plural organs in the template to a corresponding organ in volume data; and perform a first processing and a second processing a predetermined number of times. The first processing includes transforming a first organ selected among the plural organs in the template according to a corresponding first organ in the volume data, and the second processing includes transforming, for each of second organs that are predetermined organs, which are influenced by transformation of the first organ, the second organ according to transformation performed for third organs that are predetermined organs, which influence the second organ in the template.

Claims

1. An apparatus for presuming positions of organs, comprising:

a memory; and

a processor configured to execute a process, the process comprising;

first transforming a plurality of organs included in a template that is a model including the plurality of organs so as to match a predetermined target organ among the plurality of organs in the template to a corresponding organ in volume data; and

performing a first processing and a second processing a predetermined number of times, wherein the first processing comprises second transforming a first organ selected among the plurality of organs in the template according to a corresponding first organ in the volume data, and the second processing comprises third transforming, for each of second organs that are predetermined organs, which are influenced by transformation of the first organ, the second organ according to transformation performed for third organs that are predetermined organs, which influence the second organ in the template.

2. The apparatus as set forth in claim 1, wherein the first processing comprises:

calculating affine parameters that make a total distance shortest, wherein the total distance is calculated by adding, with respect to a plurality of points included in the target organ, a distance between a position after converting a position of a point of the target organ in the template with the affine parameters and a position of a corresponding point of the corresponding organ in the volume data; and

transforming the target organ by using the affine parameters.

3. The apparatus as set forth in claim 1, wherein the second processing comprises:

calculating, for each of the second organs, affine parameters that make a total distance shortest, wherein the total distance is calculated by adding, with respect to a plurality of points included in the third organs, a distance between a position after converting an initial position of each point among the plurality of points with the affine parameters and a present position of each point among the plurality of points; and

transforming the second organ in an initial state by using the affine parameters.

4. The apparatus as set forth in claim 1, wherein the distance is weighted by a predetermined weight value between the second organ and the third organ.

5. The apparatus as set forth in claim 1, wherein the first transforming comprises:

calculating a first function that represents a vertebra identified from the volume data while narrowing voxel data used in the volume data;

calculating a second function that represents a vertebra identified from the template while narrowing polygons used in the template; and

performing translation and rotation so as to match the vertebra represented by the second function to the vertebra represented by the first function.

6. The apparatus as set forth in claim 1, wherein the first processing comprises excluding an organ whose volume identified from the volume data is less than a threshold from the plurality of organs to be processed.

7. A method for presuming positions of organs, the method comprising:

first transforming, by using a computer, a plurality of organs included in a template that is a model including the plurality of organs so as to match a predetermined target organ among the plurality of organs in the template to a corresponding organ in volume data; and

performing, by using the computer, a first processing and a second processing a predetermined number of times, wherein the first processing comprises second transforming a first organ selected among the plurality of organs in the template according to a corresponding first organ in the volume data, and the second processing comprises third transforming, for each of second organs that are predetermined organs, which are influenced by transformation of the first organ, the second organ according to transformation performed for third organs that are predetermined organs, which influence the second organ in the template.

8. A non-transitory computer-readable storage medium storing a program for causing a computer to execute a process, the process comprising:

first transforming a plurality of organs included in a template that is a model including the plurality of organs so as to match a predetermined target organ among the plurality of organs in the template to a corresponding organ in volume data; and

performing a first processing and a second processing a predetermined number of times, wherein the first processing comprises second transforming a first organ selected among the plurality of organs in the template according to a corresponding first organ in the volume data, and the second processing comprises third transforming, for each of second organs that are predetermined organs, which are influenced by transformation of the first organ, the second organ according to transformation performed for third organs that are predetermined organs, which influence the second organ in the template.