JPH05103793A - Plan support device for spinal column correction operation - Google Patents

Abstract

PURPOSE:To provide the plan support device of a spinal column correction operation to support a clinician visually when a bone piece portion to be cut under a spinal column correction operation plan is decided. CONSTITUTION:On the basis of a signal sent out from an image input device 1, a center line passing the three-dimensionwise gravity center of each vertebra image made separatable and movable is sought at a control portion 2, and a deletion plane to divide equally part of bone piece images that have been accumulated by moving the center line of each vertebra image over a curved line passing the gravity center of a set normal spinal column, is sought, and a composite image in which a bone piece portion to be removed by means of the deletion plane is colored at the former bent spinal column image, is displayed at an image display device 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinal orthodontic surgery planning support device for visually assisting a clinician in determining a bone fragment to be cut in a spine constituting a spinal column in a spinal orthodontic surgery plan.

[0002]

2. Description of the Related Art There is a disease called spondylolisthesis in which the spinal column is curved due to a slight inclination of each vertebra that constitutes the spine of the human body. In order to correct the curvature of the spinal column, a spinal correction surgery is performed in which a part of the spine is cut and corrected to form a normal spinal curve. It is not easy to draw up this surgical plan and determine the cut portion of each spine, because it depends on the intuition and experience of a skilled clinician. For example, a three-dimensional image of a curved spine is displayed on an image display device using a CT device or the like, a cutting unit necessary for spine correction is designated on the screen using a simulation device, and the cutting unit is removed from each spine image. Then, the positions of the bone fragments to be cut are determined by recombining the spine images to determine whether a normal spinal curve can be formed.

[0003]

However, since the planning of the spinal orthodontic surgery using the conventional simulation device depends on the intuition and experience of the clinician, it is difficult to find and determine the cutting portion in each spine by trial and error. It has become a work. Therefore, there is a problem in that it takes a long time to prepare an operation plan, which imposes a heavy burden on the operator.

The present invention has been made in order to solve these problems, and visually displays the position of a bone fragment to be cut, and gives a clinician etc. effective information in planning an operation plan. It is an object of the present invention to provide a plan support device for spinal correction surgery.

[0005]

A plan support apparatus for spinal orthodontic surgery according to the present invention is an image input apparatus for sending a spinal column tomographic image signal obtained from an X-ray CT apparatus or the like to a storage unit, and the spinal column tomographic image signal. By storing the storage unit and adjusting the threshold level of the CT value based on the stored signal, the region of the spine that constitutes the spinal column is extracted, and each spine image is separated from the spinal column image, and at the same time, each spine image is separated. A centerline that passes through the three-dimensional center of gravity is found, and the centerline of each spine image is moved to a curved line that passes through the center of gravity of the normal spinal column that is set, and a deletion plane that evenly divides the overlapping bone fragment images is obtained A partial determination means, an image combining means for outputting a signal for compositely displaying a bone fragment to be removed by the deletion plane on the original curved spinal column image, and a target image by receiving an output signal from the image combining means Image display device Characterized by comprising and.

[0006]

In the plan support device for the corrective spinal surgery of the above means,
Move the spine images so that an ideal spinal curve can be formed, and divide the parts where the spine images overlap into equal parts. The range of bone fragments can be minimized. Further, since the cut portion of the bone fragment is three-dimensionally colored and displayed, the clinician can objectively grasp the appropriate cutting position in each spine when making a plan for orthodontic surgery.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a functional block diagram of a plan support apparatus for spinal correction surgery.

This apparatus comprises an image input apparatus 1 for outputting a spinal column tomographic image signal obtained by an X-ray CT apparatus, a storage unit 21, a cutting portion determining means 22 and an image synthesizing means 23.
The control unit 2 includes an image display device 3 that displays a target image, and an external storage device 4 that stores a target image signal and the like.

In the storage unit 21, the spinal column tomographic image signal sent from the image input apparatus 1 and the respective means 22, 2 of the control unit 2 are provided.
3 is temporarily stored, and these stored signals can be stored in the external storage device 4 such as a hard disk or a floppy disk.

Next, the procedure of the image signal processing performed in the control section 2 based on the cutting section determining means 22 and the image synthesizing means 23 will be described.

FIG. 2 is an explanatory diagram showing the procedure of the image signal processing performed by the control unit 2.

In the cut portion judging means 22, first, the threshold value level of the CT value of the image signal stored in the storage portion 21 is adjusted to perform the binarization processing for extracting the spinal region (22).
1).

After the binarization process, a three-dimensional spine image 5 is constructed, and a three-dimensional labeling process is performed so that each spine image 6 of the spinal column image 5 can be separated and moved (222). Then, the center line passing through the three-dimensional center of gravity 7 of each labeled spine image 6 is obtained, and the center line of each spine image 6 is moved to the center line of the spinal column curve 8 passing through the set center of gravity of the normal spine. 3 to FIG. 3 from the spinal column image 5 of the polygonal line 10 shown in FIG.
Coordinate conversion processing is performed to obtain a corrected spinal column image 9 of the normal spinal column curve 8 shown in (b) (223). After this coordinate conversion process, a determination process is performed that obtains a deletion plane 12 that equally divides the partial images 11 of the overlapping bone fragments of each spine image 6, and indicates the bone fragment removed by the cutting plane 12 as the cutting part 13. Do (2
24).

The amount by which the spine images 6 are overlapped during the coordinate conversion process can be adjusted by the operator.
Being able to show in detail the bone fragments to be cut of each spine.

In the image synthesizing means 23, each spine image 6 is processed by inverse coordinate transformation or the like to obtain the original curved spine image 5, and the deletion plane 1 is applied to this spine image 5.
Image composition is performed in three dimensions by coloring the cut portion 13 removed by 2 (225). Then, this image synthesis signal is sent to the image display device 3, and the image display device 3 which has received this signal displays a target three-dimensional synthetic image as shown in FIG.

In addition, the plan support apparatus for orthopedic surgery may be capable of displaying an image of the spinal column after removing the cutting portion 13. As a result, it is possible to easily compare the spinal column image in the surgery plan of the present device with the spinal column image after the corrective surgery, and thus it becomes possible to confirm the quality of the spinal corrective surgery.

[0018]

As described above, according to the spinal correction surgery planning support device of the present invention, the portion of the bone fragment to be cut is colored and displayed on the curved spinal column image three-dimensionally displayed on the image display device.
An operator such as a clinician can objectively grasp an appropriate cutting position of each spine when making a plan for orthopedic surgery, and can obtain information effective for actually determining the cutting position. Therefore, the burden on the clinician can be reduced, and the time required to make a surgical plan and determine the cut portion of the spine can be shortened.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a procedure of image signal processing in the apparatus of the embodiment.

FIG. 3 is an explanatory diagram showing spinal column correction performed by the apparatus of the embodiment.

FIG. 4 is an explanatory view showing a combined display of a removed portion of a bone fragment performed by the apparatus of the embodiment.

[Explanation of symbols]

 2 Control part 5 Spinal column image 6 Spinal column image 9 Corrected spinal column image 12 Cutting plane 13 Cutting part

Claims (1)

[Claims] 1. An image input device for transmitting a spinal column tomographic image signal obtained from an X-ray CT apparatus to a storage unit, a storage unit for storing the spinal column tomographic image signal, and a CT based on the storage signal.
By adjusting the threshold level of the value, the regions of the spine that make up the spinal column are extracted, each spine image is separated from the spinal column image, and the center line passing through the three-dimensional center of gravity of each spine image is obtained and set. By moving the center line of each spine image onto the curve passing through the center of gravity of the normal spine, a cutting portion determination means for obtaining a deletion plane that evenly divides the overlapped bone fragment image portion, and the original curved spine image And an image display unit for displaying a target image by receiving an output signal from the image combining unit, the image combining unit outputting a signal for displaying the combined image by coloring the bone fragments to be removed by the deletion plane. Planning support device for orthopedic surgery.