JP2000102533A - X-ray ct instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray CT instrument dispensing with a puncture needle holding device, and capable of keeping the cleanliness and surely sticking the needle while observing a CT radioscopic image even through a target tissue moves. SOLUTION: A subject tomographic image 4 is displayed on a monitor by CT radioscopic of an X-ray CT instrument, and two points, that is, a target tissue point 3 from which the focus tissue of the subject tomographic image 4 is to be taken, and a puncture needle 5 sticking point 1 are designated, whereby two guide lines 2 separated by a predetermined distance are superposed and displayed on the subject tomographic image 4 on the monitor. An operator moves the stick needle 5 between the displayed two guide lines to surely take the tissue of the target tissue point 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an X-ray CT apparatus, and more particularly, to a puncture guide on a monitor by X-ray CT fluoroscopy.

[0002]

2. Description of the Related Art A small piece is collected by puncturing a focus tissue,
The histopathological diagnosis is performed on organs such as the kidney. In a biopsy in which a tissue is collected by piercing a puncture needle, a tomographic image of an ultrasonic diagnostic apparatus is used to know the direction of the puncture needle. The ultrasonic diagnostic apparatus is capable of real-time display, has high safety, is compact, is portable, and is relatively inexpensive. Therefore, it is convenient for imaging a tomographic image of a soft tissue of a living body.

FIG. 4 shows an ultrasonic probe 7 of an ultrasonic diagnostic apparatus and a puncture ultrasonic probe having a puncture needle 5 which can be punctured by changing its angle beside it. FIG. 5 shows a sector type ultrasonic tomographic image 8 by the ultrasonic probe 7. Ultrasonic waves are emitted from the distal end of the ultrasonic probe 7 into the body of the subject, and ultrasonic echoes of the respective tissues are sequentially detected to form a tomographic image. As shown in FIG. 5, a target tissue point 3 that is likely to be a lesion in the ultrasonic tomographic image 8 is detected, and a distance D between the insertion point 1 of the puncture needle 5 and the target tissue point 3 on the image and puncture is performed on the vertical axis. The insertion angle θ of the needle 5 is determined. Then, the insertion angle θ of the puncture needle 5 of the puncture ultrasonic probe is fixed, the puncture needle 5 is punctured from the insertion point 1 by the stroke D, and the target tissue point 3
Of the tissue and taken out.

[0004] However, if there is a tissue which is difficult to depict with an ultrasonic diagnostic apparatus, for example, a bone or an air layer, the ultrasonic wave is reflected by the layer, and the information behind it cannot be observed because of the shadow. In order to solve this problem, C
Puncturing using T fluoroscopy has been performed. X-ray CT fluoroscopy is a function that enables the image reconstruction processing speed to be 10 times or more faster than that of the conventional system, so that images can be displayed in real time in parallel with scanning at a speed of several frames per second like a moving image. Yes, and can be observed continuously in real time like X-ray fluoroscopy. It is used to observe the state of insertion of a puncture needle during a biopsy to improve puncture accuracy.

A method of puncturing by X-ray CT fluoroscopy will be described with reference to FIG. First, a subject tomographic image 4 is taken by X-ray CT fluoroscopy. The target tissue point 3 which is likely to be a lesion in the tomographic image 4 of the subject is detected. A plan is determined from which direction the target tissue point 3 is inserted and a tissue piece is collected. Then, determine the insertion point 1,
The angle θ of the puncture needle 5 determined by the distance D to the target tissue point 3 and the insertion direction 9 is measured on the tomographic image. Next, the puncture needle 5 is punctured at the puncture point 1 on the body surface of the subject, and punctured while observing a tomographic image on a monitor while performing CT fluoroscopy at a stroke D at an angle θ and puncturing the target tissue point 3. The tip of the needle 5 is confirmed, and a tissue strip at the target tissue point 3 is collected there and taken out.

[0006]

Although the puncture by the conventional X-ray CT apparatus is performed as described above, it is difficult for a person operating at the time of puncture to keep the puncture needle 5 at the planned puncture angle θ. Have difficulty. A puncture needle holding device that holds this angle has also been proposed, but the device becomes large-scale,
Further handling is difficult because it is necessary to maintain cleanliness. Furthermore, when performing puncture of the chest and abdomen, the target tissue moves due to respiration and the like, so that there is a problem that accurate puncture cannot be performed in the direction and depth as planned.

[0007] The present invention has been made in view of such circumstances, and does not require a separate puncture needle holding device, can maintain cleanliness, and can operate even if the target tissue moves. It is an object of the present invention to provide an X-ray CT apparatus capable of performing accurate puncture while observing an X-ray CT fluoroscopic image.

[0008]

In order to achieve the above object, an X-ray CT apparatus according to the present invention has a high image reconstruction processing speed, and simultaneously real-time X-ray tomographic images during scanning. An X-ray CT apparatus capable of displaying is provided with means for pointing out a puncture needle insertion point and a target tissue point on a tomographic image on a display unit and displaying two guide parallel lines with a predetermined width on a straight line connecting the two points. Things.

The X-ray CT apparatus of the present invention is configured as described above, and the guide parallel line is superimposed and displayed in the planned puncture direction on the X-ray CT fluoroscopic image. When the puncture is advanced, the tip of the puncture needle passes between the guide parallel lines so that the puncture can be performed in the direction as planned. Further, even when the target tissue moves due to body movement, the degree of movement can be easily recognized by the guide parallel line, and the puncture direction can be easily corrected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the X-ray CT apparatus according to the present invention will be described with reference to FIGS. X-ray C of the present invention
The T device includes a CT fluoroscopic mechanism 20 and a mouse pointer mechanism 2
1 and a display mechanism 2 for calculating a guideline 2 for puncturing on the image display unit 14 by calculating based on information pointed by the mouse
2 is comprised. As shown in FIG. 2, the CT fluoroscopic mechanism 20 fetches the signal from the detector 15 into the main data memory 16 by the scan control unit 18, and the reconstructing unit 17 capable of performing high-speed image reconstruction processing has 10 times or more the conventional structure. The image display unit 14 performs image processing at a speed, and converts an image in real time during scanning into a moving image at a speed of several frames per second.
Can be displayed. Mouse pointer mechanism 21
On the subject tomographic image 4 displayed on the image display unit 14,
By setting a mouse pointer at a target tissue point 3 at which a tissue is collected by puncturing the puncture needle 5 and an insertion point 1 on the surface of the tomographic image 4 of the subject into which the puncture needle 5 is inserted, information on the point is displayed and controlled. Take it into the unit 13. The display control unit 13 reads the coordinate positions of the target tissue point 3 and the insertion point 1, calculates two parallel lines parallel to a straight line connecting the two points and separated by a predetermined distance, and calculates the image display unit 14. The two guidelines 2 are superimposed on the subject tomographic image 4 and displayed as shown in FIG. These operations are performed by the CPU 10 via the bus line 19.

Next, an operation procedure of the X-ray CT apparatus according to the present invention will be described. The subject is X-ray CT-transparent and the image display unit 14 displays the tomographic image 4 of the subject. The target tissue point 3 which is likely to be a lesion in the tomographic image 4 of the subject is detected. Image display unit 1 with mouse 11
Point the mouse on the target tissue point 3 of 4. Next, the insertion point 1 for puncturing the puncture needle 5 on the body surface of the subject tomographic image 4 is determined. Then, the insertion point 1 is pointed with the mouse 11. By pointing the mouse to the target tissue point 3 and the insertion point 1, two guide lines 2 as shown in FIG. 1 are displayed on the tomographic image 4 of the subject on the image display unit 14.

Next, the surgeon holds the puncture needle 5 and enters the puncture position near the subject. The operator performs X-ray CT fluoroscopy, looks at the tomographic image 4 of the subject on the image display unit 14 (a nearby monitor), and inserts the puncture needle 5 into the insertion point 1 between the two guide lines 2.
The puncture is advanced so that the tip of the puncture needle 5 passes between the two guide lines 2 of the tomographic image 4 of the subject on the image display unit 14. Also, even when the target tissue point 3 moves due to body movement, the degree of movement can be easily determined by the two guidelines 2,
The puncture direction can also be easily corrected.

When the tip of the puncture needle 5 reaches the target tissue point 3, the lesion tissue is punctured to collect a small piece thereof. Then, the puncture needle 5 is slowly pulled out. At the same time, X-ray CT fluoroscopy is stopped. When puncturing is performed with the puncture guide of the X-ray CT apparatus of the present invention, a more accurate biopsy can be performed without requiring a large-scale apparatus.

In the above embodiment, the two guide lines 2 separated by a predetermined distance are automatically drawn on the tomographic image 4 of the subject on the image display unit 14. In some cases, it is easier to perform puncturing if guideline 2 is located closer to the planned puncturing direction. In this case, the guide line 2 may be drawn at the position of the mouse point 6 with the mouse 11 as shown in FIG.

[0015]

The X-ray CT apparatus according to the present invention is configured as described above, and a target tissue point for puncturing a lesion tissue and collecting a strip thereof on a tomographic image of a subject on an image display unit; If the insertion point at which the puncture needle is punctured on the body surface of the specimen is pointed out with a pointer, two guidelines are automatically displayed on the tomographic image of the subject, so that a large-scale device is not required and another device is required. Since it is not used, cleanliness can be maintained, and accurate puncturing can be performed even when the subject moves.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of an X-ray CT apparatus of the present invention.

FIG. 2 is a view for explaining display of a puncture guide mark of the present invention on a monitor.

FIG. 3 is a diagram showing another embodiment of the X-ray CT apparatus of the present invention.

FIG. 4 is a view showing a conventional ultrasonic probe with a puncture needle.

FIG. 5 is a diagram for explaining a puncturing method using an ultrasonic tomographic image.

FIG. 6 is a view for explaining a conventional puncturing method using X-ray CT fluoroscopy.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Insertion point 2 ... Guideline 3 ... Target tissue point 4 ... Subject tomographic image 5 ... Puncture needle 6 ... Mouse point 7 ... Ultrasonic probe 8 ... Ultrasonic tomographic image 9 ... Insertion direction 10 ... CPU 11 ... Mouse DESCRIPTION OF SYMBOLS 12 ... Keyboard 13 ... Display control part 14 ... Image display part 15 ... Detector 16 ... Main data memory 17 ... Reconstruction part 18 ... Scan control part 19 ... Bus line 20 ... CT fluoroscopy mechanism 21 ... Mouse pointer mechanism 22 ... Display mechanism

Claims (1)

[Claims] 1. An X-ray CT apparatus having a high-speed image reconstruction processing speed and capable of displaying an X-ray tomographic image in real time in parallel with a scan. An X-ray CT apparatus comprising means for pointing out a tissue point and displaying two guide parallel lines with a predetermined width on a straight line connecting the two points.