# US 2014/0193789 A1 · Cutting simulation device and cutting simulation program

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- Number: US 2014/0193789 A1
- Document ID: US20140193789A1
- Status: Published application
- Kind: A1
- Application number: 14/235,246
- Filed: 2012-07-05
- Published: 2014-07-10
- Earliest claimed: 2011-07-28
- Inventors: Ryoichi Imanaka; Tsuyoshi Kohyama; Tomoaki Takemura; Keiho Imanishi
- Web page: https://patentgrep.com/patent/US20140193789A1

## CPC

- G09B 23/28: for medicine
- A61B 34/10: Computer-aided planning, simulation or modelling of surgical operations
- G06T 15/08: Volume rendering
- G06T 19/00: Manipulating three-dimensional [3D] models or images for computer graphics
- A61B 6/466: {adapted to display 3D data}
- A61B 6/5223: {generating planar views from image data, e.g. extracting a coronal view from a 3D image}
- A61B 2034/101: {Computer-aided simulation of surgical operations}
- A61B 2034/107: {Visualisation of planned trajectories or target regions}
- G06T 2210/41: Medical
- G06T 2219/008: Cut plane or projection plane definition
- G09B: EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS (devices for psychotechnics or for testing reaction times A61B5/16; games, sports, amusements A63; projectors, projector screens G03B)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

A PC (1) comprises a tomographic image information acquisition section (6), a memory (9), a volume rendering calculator (13), a display unit (2), a mouse (4), and a voxel label setting section (18). The tomographic image information acquisition section (6) acquires tomographic image information. The memory (9) stores voxel information about the tomographic image information. The volume rendering calculator (13) samples voxel information in a direction perpendicular to the line of sight, on the basis of the voxel information. The display unit (2) displays calculation results from the volume rendering calculator (13). The mouse (4) inputs cutting instructions for a liver (22) displayed on the display unit (2). The voxel label setting section (18) displays the status of the liver (22) after cutting using the cutting instructions from the mouse (4), and displays blood vessels (23) inside the liver (22) included in a cut portion (C), in a pre-cut state even after cutting.

## Claims

### Claim 1

A cutting simulation device, comprising:
a tomographic image information acquisition section configured to acquire tomographic image information;
a memory connected to the tomographic image information acquisition section, configured to store voxel information about the tomographic image information;
a volume rendering calculator connected to the memory, configured to sample voxel information in a direction perpendicular to the line of sight, on the basis of the voxel information;
a display unit configured to display calculation results from the volume rendering calculator;
an input section with which instructions for cutting a cutting object displayed on the display unit is inputted; and
a display controller configured to display on the display unit the status of the cutting object after cutting on the basis of the cutting instructions inputted with the input section, and displaying non-cutting objects included inside the cutting object, on the display unit in a pre-cut state even after cutting, even when included in a cut portion according to the cutting instructions.

### Claim 2 (depends on 1)

The cutting simulation device according to claim 1,
wherein, if the non-cutting objects are included in the cut portion, the display controller switches the voxel data for the cut portion with voxel data for the non-cutting objects, and displays the result on the display unit.

### Claim 3 (depends on 1)

The cutting simulation device according to claim 1,
wherein color information is added to the voxel information corresponding to the cutting object and the non-cutting objects in display on the display unit, and
the display controller displays the non-cutting objects on the display unit in a different color from the color of the cutting object.

### Claim 4 (depends on 1)

The cutting simulation device according to claim 1,
wherein a range of CT values indicating the extent of spatial X-ray absorption during X-ray irradiation of a subject is set for the cutting object and the non-cutting objects, and
the display controller displays the desired cutting object and non-cutting objects on the display unit on the basis of the CT values inputted via the input section.

### Claim 5 (depends on 1)

The cutting simulation device according to claim 1,
wherein the cutting object includes an organ or bone.

### Claim 6 (depends on 1)

The cutting simulation device according to claim 1,
wherein the non-cutting object includes blood vessels or nerves.

### Claim 7

A cutting simulation program for causing a computer to execute a cutting simulation method comprising:
an acquisition step of acquiring tomographic image information;
a volume rendering step of sampling voxel information in a direction perpendicular to the line of sight, on the basis of voxel information about the tomographic image information;
a first display step of displaying calculation results from the volume rendering; and
a second display step of displaying on the display unit the status of the cutting object after cutting on the basis of the cutting instructions inputted with respect to the displayed cutting object, and displaying non-cutting objects included inside the cutting object, on the display unit in a pre-cut state even after cutting, even when included in a cut portion according to the cutting instructions.