JPH0690927A - Position detecting method and position display implement used therefor - Google Patents

Abstract

PURPOSE:To continuously detect an image pickup of an object to be detected by superposing and arranging a V-shaped position display implement on the object to be detected, detecting both of them and obtaining both detected images, and detecting a display position of the detected image of the object to be detected in accordance with a cross section image of the position display implement. CONSTITUTION:In the case of obtaining a cross section image of a human body 1 by a method of an MRI, a plane vision V-shaped position display implement 3 which is made of gelatin and in which the inside of a hollow part is filled with vitamin E is placed in the upper part of the human body 1 lying on his back on a bed. Subsequently, the cross section image 15 of the human body obtained by the MRI is displayed on a screen 14 of a visual observation display means of a cathode ray tube, etc., together with images 17, 18 of the position display implement 3 at that time. In this case, an interval L of images 17, 18 on the screen 4 is measured, and a distance D from a connecting end part 6 being the apex of the V-shape of the position display implement 3 is obtained. That is, the connecting end part 6 of the position display implement 3 is superposed and arranged in, for instance, a sword-like projection 19 of the human body 1, and the position display implement 3 is arranged so that a bisector 20 passes through the sternum wall 21 of the human body 1, by which an exact position of a photographing part 16 is known.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detecting method and a position display tool used therefor when performing tomography of a human body or the like.

[0002]

2. Description of the Related Art Conventionally, in obtaining a cross-sectional image of a human body using an MRI (magnetic resonance tomography apparatus), the MR
The tomographic image of I is an image that crosses the axial direction of the living body at a certain interval, and the position of a part of the MRI tomographic image in the direction perpendicular to the axial direction of the living body and the MRI tomographic image It is necessary to know how far away is the reference point, for example, from the xiphoid process. Conventionally, spherical liver oil is pasted on a desired human body part with cellophane tape or the like, and the imaging position can be known in the tomographic image so that the image appears in the tomographic image. In such a prior art, it takes time to accurately bring the transverse image to the position where the liver oil is applied, and it is difficult to easily know a tomographic image at a desired part of the human body.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a position detection method and a position display tool used therefor, which enable continuous and accurate recognition of an imaged portion such as a transverse image of an object to be detected such as a human body. Is to provide.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a V-shaped position display tool is placed on an object to be detected, the position display tool and the object to be detected are detected by a detection device, and both detected images are detected. And a display position of the detected image of the detected object is detected corresponding to the cross-sectional image of the position display tool shown in the image.

Further, according to the present invention, one end of a pair of linear cylinders is connected to each other to form a V-shape as a whole, and the inside of the cylinder having a sealed space is filled with an organic compound. A position display tool characterized by being configured as follows.

[0006]

According to the present invention, the position indicating tool is formed in a V shape, and the position indicating tool is arranged above or below an object to be detected such as a human body to obtain a transverse image by a method such as MRI. At this time, a pair of cylinders appear in the image, and by knowing the distance between the cylinders, the distance from the connected end of the cylinder of the position display tool, and thus the imaging site on the detected object, can be easily determined. In addition, you will be able to know continuously.

Further, in such a position indicating tool, the cylinder is filled with an organic compound, and therefore, the image of the position indicating tool appears white in the transverse image of the object to be detected and is clearly shown with a large contrast. .

The material of the cylinder is a non-magnetic material,
For example, it is made of a material such as gelatin or synthetic resin. As the organic compound filled in the cylinder, for example, fats or vitamins are preferable, and vitamin E is particularly preferable.
Is preferable, and such a preferable organic compound is white in the MRI image because hydrogen (H) in the compound is not present as a molecule (H ₂ ) or atom at the end of the branch, that is, it is not excited by a strong magnetic field. Is displayed. The property of the organic compound filled in the cylinder may be liquid or solid.

The position indicating tool has only to be formed in a V shape as a whole, and may be made of a solid and uniform substance.

[0010]

FIG. 1 is a plan view of an embodiment of the present invention.
In order to obtain a cross-sectional image of the human body 1 by the MRI method, the human body 1 is laid on a bed 2 (see FIG. 3, which will be described later), and the position indicating tool 3 according to the present invention is placed on top of the human body 1. Put.

FIG. 2 is a sectional view taken along section line II-II in FIG. The position indicator 3 has a pair of linear cylinders 4 and 5 connected at their ends 4a and 5a as indicated by reference numeral 6, and forms an angle θ to form the overall planar shape in FIG. Are formed in a V shape. The angle θ may be, for example, 15 degrees. The cylinders 4 and 5 are made of gelatin and form the position indicator main body 7. This cylinder 4, 5
Vitamin E is filled therein as indicated by reference numerals 8 and 9.

FIG. 3 is a diagram showing a simplified overall structure for arranging the position indicating tool 3 on the human body 1 in an overlapping manner to obtain a transverse image by the MRI method. Human body 1 and position indicator 3
4, a magnetic field generating means 10 is provided and connected to a processing circuit 11 realized by a microcomputer or the like, and a transverse image thereof is stored in a memory 12 and shown in a visual display means 13 such as a cathode ray tube in FIG. Crossed image 15
Screen 14 is obtained. The cross-sectional image of the human body 1 is as indicated by the reference numeral 15, and the images 17 and 18 of the position indicator 3 at the imaging portion 16 correspond to the respective cylinders 4 and 5 filled with vitamins E8 and 9. , Are displayed respectively. Image 1 of the cylinders 4 and 5 of the position indicator 3 shown on the screen 14
The distance L between 7 and 18 is measured, and the distance L corresponds to the actual distance L1 in FIG. 1. By measuring this distance L, as shown in FIG. The distance D from the connecting end portion 6 can be known. In this way, the distance D from the connecting end portion 6 of the position indicator 3 on the human body 1 is determined in correspondence with the distance L between the images 17 and 18 of the position indicator 3 displayed on the screen 14 of the display means 13. I can know. By displaying such a graph shown in FIG. 5 on the image of FIG. 4, the observer can easily know the position of the imaging region 16.

The connecting end portion 6 of the position indicating tool 3 is arranged so as to overlap with, for example, the sword-like projection 19 of the human body 1, and the bisector 20 of the axes of the cylinders 4 and 5 is arranged in the sternum ridge 21 of the human body 1. By arranging the position display tool 3 on the human body 1 so as to pass through, it is possible to know the exact position of the imaging region 16. That is, in order to know how much the cross-sectional image 15 obtained as shown in FIG. 4 is displaced from the xiphoid process 19 in the axial direction of the human body 1 (vertical direction in FIG. 1), that is, the distance D, Is calculated as follows. In FIG. 1, the equation 1 is established.

[0014]

[Equation 1]

Here, the size of the actual overall position shown in FIG. 1 and the size of the transverse image 15 shown in FIG.
Then, it becomes as shown in the equation 2.

[0016]

[Equation 2]

Therefore, the distance D is calculated from Equation 1 and Equation 2 by Equation 3
Can be calculated and obtained.

[0018]

[Equation 3]

Therefore, by specifying the distance L between the transverse images 14, the distance D can be known, as described above with reference to FIG. The direction perpendicular to the axial direction of the human body position of each part of this cross-sectional image 15 (the horizontal direction in FIGS. 1 and 2)
The position of can be known by the images 17, 18.

The position indicator 3 can be implemented not only in relation to the human body but also in a wide range in relation to other objects to be detected. The position display tool 3 may be arranged below the human body 1.

[0021]

As described above, according to the present invention, the V-shaped position indicating tool is placed on the object to be detected to obtain a transverse image, and the position indicating tool shown in the transverse image is displayed. By knowing the distance between the cylinders, the distance from the connecting end of the cylinder of the position display tool can be obtained, and thus the imaging site of the object to be detected can be continuously and easily known.

The position indicator is a cylindrical body made of a non-magnetic material such as gelatin filled with an organic compound such as vitamin E. Therefore, the position indicator is displayed in a transverse image of a living body such as a human body. The image of the tool appears clearly, and the distance between the cylinders, and thus the axial distance of the living body from the reference point such as the xiphoid process, can be accurately known in the transverse image.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a position display tool 3 is placed on a human body 1 according to an embodiment of the present invention to obtain a transverse image by an MRI method.

FIG. 2 is a cross-sectional view of the position indicating tool 3 taken along the section line II-II in FIG.

FIG. 3 is a block diagram showing a configuration for obtaining a transverse image of the human body 1 by an MRI method.

FIG. 4 is a diagram showing a transverse image 14 obtained by a display unit 13.

FIG. 5: Cylindrical body 4 of the position indicator 3 shown in the transverse image 14.
5 is a graph showing the relationship with the distance D from the connection end portion 6 of the position display tool 3 corresponding to the distance L between the images 17 and 18 of FIG.

[Explanation of symbols]

 1 Human Body 2 Bed 3 Position Display Tool 4, 5 Cylindrical Body 6 Connection End 7 Position Display Tool Body 8, 9 Vitamin E 10 Detection Means 11 Processing Circuit 13 Display Means 14 Screen 15 Transverse Image of Human Body Position 17, 18 Cylindrical Body 4 , 5 image L interval D distance

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location 9219-2J G01N 24/02 A

Claims (2)

[Claims] 1. A V-shaped position display tool is arranged so as to overlap an object to be detected, the position display tool and the object to be detected are detected by a detection device, and both detection images are obtained, which appear in the image. A position detecting method which detects a display position of a detection image of an object to be detected corresponding to a cross-sectional image of a position display tool. 2. A structure in which one end of a pair of linear cylinders is connected to each other to form a V-shape as a whole, and a cylinder having a sealed space is filled with an organic compound. A position display tool characterized by: