JP2000070272A - Insertion guide device for puncture needle for biopsy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to safety, hygienically and easily insert a puncture needle for biopsy into an examinee. SOLUTION: This insertion guide device for the puncture needle for biopsy displays a CT tomographic image indicating the insertion cross section of the puncture needle previously obtd. by X ray laminography on a display monitor 17. If an operator assigns the tissue collection point for biopsy and the insertion start point of the puncture needle on the CT tomographic image with screen input by an operator console 10, the laser beam of a light projector 18 is automatically directed toward the insertion direction of the puncture needle. As a result, the operator is able to extremely easily insert the puncture needle into the examinee and, in addition, there is no need for using a mechanical adapter having a worry in terms of hygiene and both of the examinee and the operator are not kept exposed with X-rays and, therefore, there is no worry in terms of safety.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biopsy puncture needle insertion guide device used for inserting a puncture needle into a subject in order to collect a tissue to be biopsied from the inside of the subject. The present invention relates to a technique for inserting a biopsy needle safely, hygienically, and easily.

[0002]

2. Description of the Related Art A so-called biopsy in which a puncture needle for a biopsy (appropriately abbreviated as "puncture needle") is inserted into the body of a subject for a cancer test or the like and a tissue is collected is performed in a medical institution.
In a conventional biopsy, the insertion state of the puncture needle is usually displayed on the display monitor screen using an ultrasonic diagnostic apparatus, so that the puncture needle can be accurately moved to the tissue sampling point while observing the insertion state of the puncture needle in real time. To be plugged into. However, it is impossible to observe the insertion state of the puncture needle with the ultrasonic diagnostic apparatus when collecting a tissue that is difficult to draw with the ultrasonic diagnostic apparatus or a tissue that becomes a shadow of the bone.
In such a case, a CT tomographic image obtained by the X-ray CT imaging mechanism is used.

[0003] Directly, a CT tomographic image (CT fluoroscopy) is continuously obtained and displayed by an X-ray CT imaging mechanism, and the state of insertion of the puncture needle is observed in real time while the puncture needle is moved to a tissue sampling point. A way to insert it accurately is conceivable.
However, a method using CT fluoroscopy is to be avoided as much as possible, since the subject and the practitioner will be continuously exposed to X-rays.

Therefore, as shown in FIGS. 9 and 10, the X-ray tube 52 emits an X-ray beam while rotating around the subject M on the top plate 51, so that a multi-channel X-ray detection is performed. CT tomographic image showing the insertion cross section of the puncture needle is obtained in advance based on the X-ray detection data output from the detector 53,
After confirming the depth of the tissue sampling point and the direction in which the puncture needle is to be inserted in accordance with the CT tomographic image, a method of accurately inserting the puncture needle into the tissue sampling point using an adapter is preferred.

In the case of the conventional system shown in FIG. 9, a mechanical adapter 54 having a substantially semicircular ring shape is used. Since the mechanical adapter 54 has a large number of needle insertion holes 54a drilled in the radial direction at regular intervals along the circumferential direction of the adapter 54, the practitioner must confirm the puncture needle DT Is selected, and the puncture needle DT is inserted through the selected needle insertion hole 54a into the body of the subject M until the depth reaches a previously confirmed depth.

In the case of the conventional system shown in FIG. 10, an optical adapter 55 having a substantially semicircular ring shape is used. The optical adapter 55 is provided with a projector 55a that emits a laser beam from the radial direction toward the center of the semicircular ring so as to be movable along the circumferential direction of the adapter 55. After the projector 55a is moved so as to match the insertion direction of the puncture needle DT, the puncture needle DT
Is inserted along the laser beam LG emitted from the projector 55a into the body of the subject M until the depth reaches a previously confirmed depth.

[0007]

However, the conventional method shown in FIGS. 9 and 10 can be said to be safe in that the subject and the practitioner do not continue to be exposed to X-rays. After setting each one 55, complicated work such as selection of the needle insertion hole 54a and movement of the projector 55a is required, and there is a problem that the insertion of the puncture needle DT is not easy. Furthermore, the former FIG.
In the conventional method, since the puncture needle DT contacts the needle insertion hole 54a, it is necessary to keep the needle insertion hole 54a always clean.
There is also a problem that it is not hygienic.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a biopsy puncture needle insertion guide device in which a biopsy puncture needle can be safely, hygienically and easily inserted.

[0009]

In order to achieve the above object, a biopsy puncture needle insertion guide device according to the present invention comprises: (a) an X-ray beam which is arranged to face a subject to be interposed therebetween; An X-ray tube for irradiation and a multi-channel X-ray detector for detecting transmitted X-rays; and (b) an X-ray tube and a multi-channel X-ray detector.
An imaging system rotation driving means for rotating the X-ray detector around the subject while facing the X-ray detector; and (c) a multi-channel type as the X-ray tube emits an X-ray beam while rotating around the subject. Image reconstruction means for performing image reconstruction processing for a CT tomographic image based on the X-ray detection data output from the X-ray detector; and (d) displaying a CT tomographic image obtained based on the result of the image reconstruction processing. A display means, and (e) an X-ray tube and a multi-channel type X attached to the imaging system rotation drive means so as to be capable of swinging movement for changing the direction of the emitted light beam within the insertion cross section of the biopsy needle. Light emitting means for rotating around the subject with the rotation of the line detector,
(F) Designating a tissue sampling point of a biopsy target in the body of the subject and a starting point of insertion of the biopsy puncture needle on the body surface on a CT tomographic image showing a cross-section of the insertion of the biopsy needle in the subject. (G) a stop rotation angle of the light projecting means, in which the direction of the light beam emitted from the light projecting means matches the insertion direction of the puncture needle, based on the tissue sampling point and the insertion start point designated by the screen input means; An angle calculating means for calculating a swing angle, and (h) an angle setting means for setting a stop rotation angle and a swing angle of the light emitting means according to the calculated angle of the angle calculating means.

According to a second aspect of the present invention, there is provided the biopsy puncture needle insertion guide device according to the first aspect, wherein (i) the puncture needle based on the tissue sampling point and the insertion start point designated by the screen input means. In addition to a distance calculating means for calculating the insertion distance, the calculated insertion distance is displayed on the display means.

[Operation] Next, a needle guide (guide) operation when the biopsy puncture needle is inserted using the biopsy puncture needle insertion guide device of the present invention (abbreviated as “guide device” as appropriate). Will be described. When the biopsy needle insertion guide device of the first aspect is used, a CT tomographic image showing a cross section of the insertion of the puncture needle is first obtained by executing X-ray tomography. That is, as the X-ray tube irradiates the X-ray beam while rotating around the subject while maintaining the opposed arrangement of the X-ray tube and the multi-channel type X-ray detector by the imaging system rotation drive means, X-ray detection data is output from the channel type X-ray detector. The image reconstructing means is configured to generate C based on X-ray detection data from the multi-channel X-ray detector.
An image reconstruction process for the T tomographic image is performed to obtain a CT tomographic image showing a cross section of the insertion of the biopsy puncture needle, and the obtained CT tomographic image is displayed on the display means.

Next, on the CT tomographic image showing the insertion cross section of the puncture needle projected on the display means by the screen input means, a tissue sampling point for a biopsy target in the body of the subject and a biopsy for the body surface are displayed. Specify the insertion start point of the puncture needle for each.
Since the direction indicated by the line segment connecting the tissue sampling point and the insertion start point corresponds to the insertion direction of the puncture needle, when both points are specified, the angle calculation means specifies the tissue sampling point specified by the screen input means. From the data of the insertion start point, the stop rotation angle and the swing angle of the light emitting means, in which the direction of the emitted light from the light emitting means matches the insertion direction of the puncture needle, are immediately calculated. Further, the stop setting angle and the swing angle of the light projecting means are set by the angle setting means according to the calculation results of the two angles. Thereby, the direction of the light beam emitted from the light emitting means is oriented in the insertion direction of the puncture needle. Thereafter, the practitioner simply inserts the puncture needle into the body of the subject along the emitted light of the light emitting means until reaching the tissue sampling point.

[0013] In the guide device of the present invention, a CT tomographic image showing the insertion cross section of the puncture needle obtained by executing X-ray tomography in advance is displayed, and the tissue sampling point and the insertion start point are input on the screen. If a simple operation of designating is performed, the emitted light from the light emitting means automatically points in the insertion direction of the puncture needle, so that the biopsy puncture needle can be easily inserted into the subject. Further, in the device of the present invention, since the light emitted from the light emitting means indicates the insertion direction of the puncture needle, there is no need to use a mechanical adapter provided with a needle insertion hole through which the puncture needle is passed, and the puncture needle can be inserted. Because it is a method to obtain a CT tomographic image showing the insertion section first,
There is no need for X-ray fluoroscopy, and neither the subject nor the practitioner continues to be exposed to X-rays.

[0014] In the guide device according to the second aspect of the present invention, the distance calculating means calculates the insertion distance of the puncture needle from the tissue sampling point and the insertion start point specified by the screen input, and displays the calculated insertion distance on the display means. Will be displayed on the screen. The practitioner can easily know the insertion distance of the puncture needle only by checking the display on the screen of the display means without having to measure the dimensions on the CT tomographic image showing the insertion cross section of the puncture needle. .

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a biopsy puncture needle insertion guide device according to an embodiment, FIG. 2 is a schematic diagram illustrating a rotation operation of the projector of the embodiment, and FIG. 3 is a swing of the projector of the embodiment. It is a schematic diagram explaining operation | movement.

The guide device of the embodiment is as shown in FIG.
An X-ray tube 2 for irradiating a fan-shaped X-ray beam (fan beam) FB opposed to the subject M on the top plate 1 and multiple X-rays for detecting transmitted X-rays The device 3a includes a multi-channel X-ray detector (abbreviated as “X-ray detector” as appropriate) 3 in which the elements 3a are arranged along the spread of the fan beam FB. The X-ray tube 2 and the X-ray detector 3 are fixed to a single rotating ring 4, and the X-ray tube 2 and the X-ray
The X-ray tube 2 rotates around the subject M while the X-ray tube 2 rotates around the subject M while the X-ray detector 3 rotates around the subject M with the imaging center Z as the axis in the opposed arrangement state. X-ray detector 3 emits X-rays
The configuration is such that line detection data is output.

In the case of the apparatus according to the embodiment, the top 1 can be moved back and forth, up and down, or left and right while the subject M is placed thereon. The movement of the top 1 is performed under the control of the top driving unit 6. Also, the X-ray tube 2 is rotating,
Under the control of the irradiation control unit 7 including a high-voltage generator and the like, the subject M is irradiated with the fan beam FB according to set irradiation conditions such as a tube voltage and a tube current. Further, control of the electric motor 5 for rotating the rotating ring 4 is performed by the imaging system rotation driving unit 8. In addition, the top plate driving unit 6, the irradiation control unit 7, or the imaging system rotation driving unit 8
Are performed in accordance with a command signal transmitted from the imaging control unit 9 in a timely manner in response to an input operation or the like on the console 10.

In the case of the embodiment apparatus, the X-ray detection data output from the X-ray detector 3 accompanying the irradiation of the fan beam FB from the X-ray tube 2 is collected by the data collection unit 12, The data is sent to an AD converter 13 for digitizing the data. After the AD conversion unit 13, a detection data memory 14 for storing X-ray detection data, an image reconstruction unit 15 for performing image reconstruction processing for CT tomographic images based on the X-ray detection data, and a CT tomographic image memory 16 are provided. Have been.
According to a command signal transmitted from the imaging control unit 9 in a timely manner,
The X-ray detection data collected by the data collection unit 12 is:
After being converted into a digital signal by the AD converter 13, it is temporarily stored in the detection data memory 14, read out at an appropriate time, and subjected to image reconstruction processing by the image reconstruction unit 15. Further, in the apparatus of the embodiment, the CT tomographic image of the cross section of the subject M specified by the input operation or the like on the console 10 is represented by C
The CT tomographic image is stored in the T tomographic image memory 16 and a CT tomographic image related to the designated cross section of the subject M is displayed on the screen of the display monitor 17. That is, the guide device of the embodiment has the configuration of a normal X-ray CT device.

The guide device according to the embodiment is the same as the CT device described above.
On the CT tomographic image showing the insertion cross section of the puncture needle, which has been captured in advance by the configuration of the imaging device and projected on the screen of the display monitor 17, the tissue sampling point of the biopsy target and the insertion start point of the biopsy puncture needle are determined. When a designation is made on the screen, the laser beam automatically indicates the insertion direction of the puncture needle. Hereinafter, this characteristic configuration will be specifically described. That is, in the embodiment apparatus, the X-ray tube 2 and the X-ray tube 2 are attached to the rotating ring 4 so as to be capable of swinging to change the direction of the laser beam as the emitted light beam within the insertion cross section of the biopsy puncture needle. A projector 18 is provided that rotates around the subject M with the rotation of the X-ray detector 3, and the console 10 as a screen input unit allows the operator to view a cross section of a biopsy puncture needle on a CT tomographic image. The configuration is such that the tissue sampling point of the biopsy target in the body of the sample M and the insertion start point of the biopsy puncture needle on the body surface can be designated on the screen. In addition, the apparatus according to the embodiment controls the light emitting device 1 based on the tissue sampling point and the insertion start point specified by the screen input by the console 10.
8, an angle calculator 19 for calculating a stop rotation angle a and a swing angle b of the light projector 18 in which the direction of the laser beam coincides with the insertion direction of the puncture needle, and a stop rotation angle of the light projector 18 according to the calculated angles of the angle calculator 19. a and swing angle b
And an angle setting unit 20 for setting the angle.

Light projector 18 mounted on rotating ring 4
As shown in FIG. 2, as the rotating ring 4 rotates, it rotates around the subject M about the imaging center Z as the axis, similarly to the X-ray tube 2 and the X-ray detector 3. Therefore, the light source of the rotating projector 18 always moves on the circle TO centered on the photographing center Z. The control of the stop rotation angle a of the light projecting unit 18 is accurately performed by the feedback control method of the rotation amount of the electric motor 5. Adjustment of the rotation amount of the electric motor 5 is performed under the control of the imaging system rotation drive unit 8. A command signal is sent from the angle setting unit 20 to the imaging system rotation drive unit 8 so that the light projector 18 stops accurately at the stop rotation angle a calculated by the angle calculation unit 19.

Further, as shown in FIG.
The direction of the laser beam (emitted beam) changes within the insertion cross section of the biopsy puncture needle in accordance with the swing movement performed independently on the rotating ring 4. Specifically, as shown in FIG. 4, the projector 18 is fixed on a pedestal 22 that rotates about a rotation axis X with the rotation of the stepping electric motor 21, and the rotation amount of the electric motor 21 is reduced. By changing the angle, the angle of the pedestal 22, that is, the swing angle of the projector 18 can be adjusted. Adjustment of the swing angle of the projector 18 is performed by control of the angle setting unit 20. The angle setting unit 2 sets the projector 18 to be accurate to the swing angle b calculated by the angle calculation unit 19.
0 controls the amount of rotation of the electric motor 21.

The angle calculation unit 19 includes a tissue sampling point A for a biopsy target in the body of the subject M, an insertion start point B of a biopsy puncture needle on the body surface, a stop rotation angle a of the light emitter 18 and a swing angle. Calculation of each angle a, b is performed according to the geometric relationship between b. As shown in FIG. 5, on the CT tomographic image showing the insertion cross section of the biopsy puncture needle displayed on the display monitor 17, the tissue sampling point A of the biopsy target in the body of the subject M is first specified. Thereafter, the insertion start point B of the biopsy puncture needle on the body surface is designated and input so as to avoid bones, organs that cannot puncture the needle, and the like. Note that the position of the photographing center Z is known.

Reference stop rotation angle of projector 18 (= 0 °)
At the position of the horizontal line ZE extending rightward through the photographing center Z. Then, the angle formed by the horizontal line ZE and the straight line ZF passing through the starting point side intersection F at which the straight line AB intersects the circle TO passing the light source of the light projector 18 with the shooting center Z is the stop rotation angle a of the light projector 18. In addition, the reference swing angle of the projector 18 (=
0 °) is set at a position where the laser beam LA of the projector 18 passes through the photographing center Z. Then, the angle between the straight line ZF and the straight line AB is the swing angle b of the projector 18.

That is, when the tissue sampling point A to be biopsied and the insertion start point B are designated, the angle calculation unit 19 determines the stop rotation angle a of the projector 18 according to the coordinates of each designated point and the above-described geometric relationship. And the swing angle b is calculated. The calculated angles a and b are displayed on the display monitor 1.
7 is displayed on the screen.

The angle setting section 20 includes an angle calculation section 19
According to the calculated stop rotation angle a and the swing angle b, the electric motor 5 is rotated to set the projector 18 to the position of the stop rotation angle a, and the electric motor 21 is rotated to set the projector 18 at the swing angle b. It is configured to be set in the posture. Of course, by setting the light projector 18 by the angle setting unit 20, the direction of the laser beam LA of the light projector 18 matches the straight line AB connecting the tissue sampling point A and the insertion start point B, and the laser beam LA of the light projector 18 This indicates the insertion direction. The laser beam LA of the projector 18 after setting the angles a and b directly hits the insertion start point B in the subject M.

Further, the apparatus according to the present embodiment calculates the insertion distance (needle insertion depth dimension) L of the puncture needle from the coordinates of the tissue input point A and the insertion start point B of the puncture needle designated and input. , And the calculated insertion distance L is displayed on the screen of the display monitor 17. The light projector 18 can also function as a light projector for positioning at the time of X-ray tomography, but the function of the light projector for positioning at the time of X-ray tomography is provided separately. A configuration performed by a light projector may be used. In any case, after the X-ray tomography is completed, the top plate 1 is moved so that the insertion cross section of the biopsy puncture needle of the subject M comes to the position of the laser beam LA of the projector 18, and then the tissue Sampling point A and insertion start point B
Will be executed.

Next, the operation of guiding the puncture needle when the insertion of the puncture needle for biopsy is performed using the apparatus having the above-described configuration will be described with reference to the drawings. FIG. 6 shows the tissue sampling point A of the subject M and the insertion start point B of the puncture needle.
FIG. 7 is a plan view showing an example of a screen of the display monitor 17 at the time of designation, FIG. 7 is a flowchart showing the puncture needle guidance status over time,
FIG. 8 is a schematic diagram showing the state of insertion of the puncture needle.

[Step S1] The subject M is placed on the top 1 and set to the X-ray tomography position.

[Step S2] X-ray tomography is performed so that a CT cross-sectional image of the inserted cross section of the biopsy needle of the subject M can be obtained.

[Step S3] A CT tomographic image showing a cross section of the subject M into which the biopsy needle is inserted is displayed on the screen of the display monitor 17, and the laser beam LA of the projector 18 is displayed.
Moves the top 1 so as to match the position of the insertion cross section of the biopsy puncture needle of the subject M.

[Step S4] As shown in FIG. 6A, a tissue sampling point A for a biopsy in the body of the subject M is first designated on the console 10 on the screen of the display monitor 17.

[Step S5] As shown in FIG. 6B, on the screen of the display monitor 17, the operation console 10 specifies the insertion start point B of the biopsy puncture needle on the body surface of the subject M.

[Step S6] As shown in FIG. 6C, the stop rotation angle a, the swing angle b, and the distance L calculated by the angle calculator 19 and the distance calculator 23 are displayed on the screen of the display monitor 17. Is displayed.

[Step S7] Each angle of the projector 18 is automatically set in accordance with the angles a and b calculated by the angle setting section 20.

[Step S8] As shown in FIG. 8A, the tip of the puncture needle DT is applied to the insertion start point B on the body surface of the subject M, which is illuminated by the laser beam LA of the projector 18.

[Step S9] As shown in FIG. 8B, the laser beam LA is made to exactly hit the needle head of the puncture needle (the direction of the laser beam LA and the insertion direction of the puncture needle DT are matched. Then, the puncture needle DT is inserted into the body of the subject M by the insertion distance L indicated on the display monitor 17, and the tissue is collected. The puncture needle DT is provided with a scale (not shown) along the longitudinal direction, and is inserted into the body of the subject M by an insertion distance L while watching the scale.

[Step S10] If the necessary tissue can be collected, the subject M is dropped from the top 1 and the process is completed.

As described in detail above, according to the apparatus of the present embodiment, the tissue sampling point A and the insertion start point B are simply designated on the screen input to the CT tomographic image showing the insertion cross section of the puncture needle DT. Since the laser beam LA of the projector 18 automatically points in the insertion direction of the puncture needle DT, the puncture needle D
Insertion into the T is very easy. In addition, there is no need to use a mechanical adapter provided with a needle insertion hole through which the puncture needle passes, so there is no need to worry about hygiene, and there is no concern about safety because neither the subject M nor the practitioner continues to be exposed to X-rays. Nor. In addition, the insertion distance L of the puncture needle is displayed on the display monitor 1.
7 can be easily known only by checking the display.

The present invention is not limited to the above embodiment, but can be modified as follows. (1) The example apparatus includes the distance calculation unit 23 that calculates the insertion distance L of the puncture needle based on the tissue input point A and the insertion start point B of the puncture needle that are designated and input. Not provided, insertion distance L for puncture needle
As a modified example, an apparatus configured to measure by a practitioner from a CT tomographic image projected on the screen of the display monitor 17 is mentioned as a modified example.

(2) In the embodiment, the stop rotation angle a and the swing angle b of the projector 18 are also displayed on the screen of the display monitor 17, but the puncture needle is inserted into the screen of the display monitor 17. A device having a configuration in which only the distance L is displayed is a modified example.

[0041]

As described above in detail, according to the biopsy puncture needle insertion guide device of the first aspect of the present invention, the puncture needle insertion cross section obtained by performing X-ray tomography in advance. If a simple operation of designating the tissue sampling point and the insertion start point by screen input is performed on the CT tomographic image indicating, the light emitted from the light emitting means is automatically directed to the insertion direction of the puncture needle. The practitioner can very easily insert the puncture needle into the subject. Further, according to the apparatus of the present invention, since the light emitted from the light emitting means indicates the insertion direction of the puncture needle, it is not necessary to use a mechanical adapter provided with a needle insertion hole through which the puncture needle passes, and the puncture can be performed. Since the CT tomographic image showing the insertion cross section of the needle is obtained first, there is no need for X-ray fluoroscopy, and neither the subject nor the practitioner continues to be exposed to X-rays. No worries.

According to the second aspect of the present invention, the distance calculating means calculates the insertion distance of the puncture needle according to the tissue sampling point and the insertion start point specified by the screen input. Since the calculated insertion distance is provided on the screen of the display means,
Even without measuring the insertion dimension of the puncture needle on the CT tomographic image of the insertion cross section of the puncture needle, the insertion distance of the puncture needle can be easily known only by checking the display on the display means, and Insertion becomes easier.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an insertion guide device for a biopsy puncture needle according to an embodiment.

FIG. 2 is a schematic diagram illustrating a rotation operation of the light projector of the embodiment.

FIG. 3 is a schematic diagram illustrating a swing operation of the projector of the embodiment.

FIG. 4 is a partial view showing a swing mechanism of the projector in the embodiment.

FIG. 5 is a schematic diagram showing a geometric relationship between each designated point in a CT tomographic image and each angle of a projector.

FIG. 6 is a plan view showing an example of a screen of a display monitor when designating a tissue sampling point or the like of a subject.

FIG. 7 is a flowchart showing a state of guiding a puncture needle in the embodiment over time.

FIG. 8 is a schematic diagram showing a state of insertion of a puncture needle in the embodiment.

FIG. 9 is a schematic diagram showing a conventional insertion method of a biopsy puncture needle.

FIG. 10 is a schematic view showing another conventional insertion method of a biopsy puncture needle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 ... X-ray tube 3 ... Multi-channel type X-ray detector 7 ... Irradiation control unit 8 ... Imaging system rotation drive unit 10 ... Operation console 15 ... Image reconstruction unit 17 ... Display monitor 18 ... Emitter 19 ... Angle calculation unit 20 ... Angle setting unit 23… Distance calculation unit A… Tissue sampling point of biopsy target B… Start insertion point of biopsy puncture needle a… Stop rotation angle b… Swing angle DT… Biopsy puncture needle FB… Fan beam ( Fan-shaped X-ray beam) M ... subject Z ... imaging center

Claims (2)

[Claims] 1. An X-ray tube for irradiating an X-ray beam and a multi-channel X-ray detector for detecting transmitted X-rays, which are arranged opposite to each other with a subject interposed therebetween, and (B) an X-ray tube and An imaging system rotation driving means for rotating the multi-channel type X-ray detector around the subject while being opposed to each other; and (c) as the X-ray tube emits an X-ray beam while rotating around the subject. Image reconstruction means for performing image reconstruction processing for CT tomographic images based on X-ray detection data output from a multi-channel X-ray detector, and (d) CT tomography obtained based on the results of the image reconstruction processing Display means for displaying an image; (e)
Attached to the imaging system rotation driving means so as to be able to swing and change the direction of the emitted light beam within the insertion cross section of the biopsy puncture needle, and to be attached together with the rotation of the X-ray tube and the multi-channel X-ray detector. (F) a tissue sampling point and a body surface of a biopsy target in the body of the subject on a CT tomographic image showing a cross section of the biopsy needle inserted in the subject; (G) a screen input means for designating the insertion start point of the puncture needle for examination, and (g) the direction of the emitted light of the light emitting means is set to the insertion direction of the puncture needle based on the tissue sampling point and the insertion start point designated by the screen input means. (H) an angle setting means for setting the stop rotation angle and the swing angle of the light projecting means according to the calculated angle of the angle calculating means. Preparative biopsy needle bayonet guide device, characterized in that it comprises. 2. The insertion guide device for a puncture needle for a biopsy according to claim 1, wherein (i) a distance for calculating an insertion distance of the puncture needle based on a tissue sampling point and an insertion start point designated by the screen input means. An insertion guide device for a biopsy puncture needle, comprising a calculation means, and configured to display the calculated insertion distance on the display means.