CT (Computed Tomography)-guided thoracic and abdominal puncture guiding method for reducing influence of respiratory movement

Abstract

The invention relates to a CT-guided thoracic and abdominal puncture guiding method for reducing the influence of respiratory movement. The method comprises the following steps that S1, a respiratory movement curve of a target object in a free breathing state is obtained; s2, in the free breathing state of the target object, according to the breathing motion curve, controlling CT imaging equipment to scan the target tissue through breathing gating in the curve area of the target object, and obtaining a CT scanning image of the target object; s3, the CT image in the S2 is matched with the respiratory movement curve in the S1, and the marked curve serves as a reference curve of the puncture moment; s4, determining a body surface needle insertion position of the puncture target tissue according to the CT image obtained in S2; and S5, monitoring the respiratory movement of the target object during puncture, obtaining a respiratory movement curve, and when the respiratory movement curve is located at the target tissue image identification point in the reference movement curve in the S3, determining the puncture moment for the target tissue. According to the invention, the puncture accuracy can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical image processing, and in particular to a CT-guided chest and abdominal puncture guidance method for reducing the influence of respiratory motion, and in particular to a CT-guided chest and abdominal puncture guidance method for reducing the adverse influence of respiratory motion. Background Art

[0002] Under the guidance of CT, the target object's chest or abdominal lesions can be punctured through the skin for biopsy or treatment, which can achieve the purpose of obtaining diseased tissue or eliminating lesions. However, the breathing of the target object will cause the chest or abdominal lesions to move, resulting in different positions of the lesions at different times, which can easily lead to puncture deviation. Therefore, it is very important to determine the time of puncture according to the breathing of the target object and reduce the adverse effects of respiratory movement.

[0003] At present, some methods reduce respiratory movement by asking the target to hold their breath during CT scanning and puncture. However, the puncture process requires multiple CT scans, and it is difficult for the target to hold their breath for each CT scan. In addition, the puncture process takes a long time, and it is difficult for the target to hold their breath for too long.

[0004] Chinese Patent: 2024103028229 discloses a method for determining the puncture time based on respiratory monitoring and related products. It determines the movement law of the target tissue through ultrasound image sequences and three-dimensional CT image sequences, and determines the time corresponding to the target movement state as the target time. The ultrasound image of this system is obtained by ultrasound equipment, but because the lungs are basically filled with gas, ultrasound waves cannot be conducted in the gas, so the ultrasound equipment cannot obtain images of lung lesions. The system matches ultrasound images with CT images. In practice, ultrasound examinations are often not performed on the same plane as CT scans, so the matching of ultrasound images and three-dimensional CT images is difficult and error-prone, and the steps are cumbersome and time-consuming, which makes it easy for the target object to change its position involuntarily.

[0005] Therefore, achieving effective and convenient reduction of the adverse effects of respiratory movement during puncture under the guidance of chest and abdominal CT with high cooperation of the target subjects is a bottleneck problem that needs to be solved urgently in this field. Summary of the invention

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide a CT-guided chest and abdominal puncture guidance method that reduces the influence of respiratory motion.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] A CT-guided chest and abdominal puncture guidance method for reducing the influence of respiratory motion comprises the following steps:

[0009] S1. Obtaining a respiratory motion curve of a target subject in a free breathing state;

[0010] S2, when the target object is in a free breathing state, according to the respiratory motion curve, the target tissue is scanned by controlling the CT imaging device through respiratory gating in the curve area to obtain its CT scan image, and the area scanned in the respiratory motion curve is marked as time domain t1;

[0011] S3, matching the CT image in S2 with the respiratory motion curve in S1, marking the scanning time of each CT image on the respiratory motion curve in S1, and using the marked curve as a reference curve at the puncture time;

[0012] S4, determining the surface needle insertion position for puncturing the target tissue according to the CT image obtained in S2;

[0013] S5. During puncture, the respiratory movement of the target object is monitored and a respiratory movement curve is obtained. When the respiratory movement curve is located at the target tissue image identification point in the reference movement curve in S3, the puncture time for the target tissue is determined.

[0014] Preferably, in the CT-guided chest and abdominal puncture guidance method for reducing the influence of respiratory motion, in S5, during the puncture process, when the target tissue needs to be repeatedly CT scanned, the scan is started within the respiratory motion curve time domain t1 through respiratory gating control.

[0015] Preferably, in the CT-guided thoracic and abdominal puncture guidance method for reducing the influence of respiratory motion, S1 adopts one of contact monitoring or non-contact monitoring to monitor the respiratory signal and obtain the respiratory motion curve of the target object in a free breathing state.

[0016] Preferably, in the CT-guided chest and abdominal puncture guidance method for reducing the influence of respiratory motion, the CT scan image in S2 is scanned by a CT scanning device.

[0017] Preferably, in the CT-guided chest and abdominal puncture guidance method for reducing the influence of respiratory motion, the CT scanning device includes a CT imaging device and a central software control device.

[0018] The CT imaging device includes an opposing X-ray tube, a flat panel detector, and a loading bed frame located between the X-ray tube and the flat panel detector;

[0019] The loading bed is used to fix the imaging target, and its operation process is as follows:

[0020] When acquiring CT images, the loading bed is kept fixed, and the X-ray tube and flat panel detector are rotated around the load to adjust the acquisition angle;

[0021] The central software control device is used to receive the respiratory signal of the imaging target and control the CT imaging device to scan and image the target tissue through respiratory gating according to the set time domain parameters.

[0022] Preferably, in the CT-guided chest and abdominal puncture guidance method for reducing the influence of respiratory motion, the matching operation of the CT image and the respiratory motion curve is as follows:

[0023] The target object is scanned using respiratory gating-controlled CT equipment. The position of the original projection data on the respiratory motion curve is obtained using the time when the X-ray tube emits rays and the movement data of the loading bed. The original projection data is then reconstructed into a CT image, and the reconstructed CT image is marked on the respiratory motion curve according to the position of the original projection data on the curve.

[0024] Preferably, in the CT-guided chest and abdominal puncture guidance method for reducing the influence of respiratory motion, the operation of determining the puncture time for the target tissue is as follows:

[0025] The breathing of the target object is monitored in real time and a dynamic respiratory motion curve is obtained. The respiratory motion curve of the identified CT image of S3 is used as a reference image, and the real-time dynamic respiratory motion curve is fitted with the reference respiratory motion curve image. When the real-time dynamic respiratory motion curve is located in the target tissue within the identified area of ​​the reference respiratory motion curve image, wherein the area range is ±2.5% of the target tissue image identified point, the puncture time for the target tissue is determined.

[0026] By means of the above scheme, the present invention has at least the following advantages:

[0027] The present invention can effectively and conveniently reduce the adverse effects of respiratory motion on puncture under the guidance of chest and abdomen CT with high target object cooperation, and can also reduce the artifact problem caused by respiratory motion, thereby improving the accuracy of puncture.

[0028] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a flow chart of the present invention;

[0031] Figure 2 is a CT scan image of the present invention;

[0032] Figure 3 It is a graph of the respiratory motion curve time domain t1 and the CT scan image of the present invention;

[0033] Figure 4 It is a diagram showing the CT scan image and the respiratory motion curve of the present invention;

[0034] Figure 5 It is a diagram that S5 of the present invention can confirm the puncture time;

[0035] Figure 6 This is a diagram showing that the puncture time cannot be confirmed by S5 of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0038] Example

[0039] like Figures 1 to 6 As shown, a CT-guided chest and abdominal puncture guidance method for reducing the influence of respiratory motion comprises the following steps:

[0040] S1. Obtaining a respiratory motion curve of a target subject in a free breathing state;

[0041] S2, when the target object is in a free breathing state, according to the respiratory motion curve, the target tissue is scanned by controlling the CT imaging device through respiratory gating in the curve area to obtain its CT scan image, and the area scanned in the respiratory motion curve is marked as time domain t1;

[0042] S3, matching the CT image in S2 with the respiratory motion curve in S1, marking the scanning time of each CT image on the respiratory motion curve in S1, and using the marked curve as a reference curve at the puncture time;

[0043] S4, determining the surface needle insertion position for puncturing the target tissue according to the CT image obtained in S2;

[0044] S5. During puncture, the respiratory movement of the target object is monitored and a respiratory movement curve is obtained. When the respiratory movement curve is located at the target tissue image identification point in the reference movement curve in S3, the puncture time for the target tissue is determined.

[0045] In S5 of the present invention, during the puncture process, when the target tissue needs to be repeatedly CT scanned, the scan is started within the time domain t1 of the respiratory motion curve through respiratory gating control.

[0046] In S1 of the present invention, a contact monitoring method or a non-contact monitoring method is used to monitor the respiratory signal, and a respiratory motion curve of the target object in a free breathing state is obtained.

[0047] The CT scan image in S2 of the present invention is scanned by a CT scanning device.

[0048] The CT scanning device of the present invention includes a CT imaging device and a central software control device.

[0049] The CT imaging device includes an opposing X-ray tube, a flat panel detector, and a loading bed frame located between the X-ray tube and the flat panel detector;

[0050] The loading bed is used to fix the imaging target, and its operation process is as follows:

[0051] When acquiring CT images, the loading bed is kept fixed, and the X-ray tube and flat panel detector are rotated around the load to adjust the acquisition angle;

[0052] The central software control device is used to receive the respiratory signal of the imaging target and control the CT imaging device to scan and image the target tissue through respiratory gating according to the set time domain parameters.

[0053] The matching operation of the CT image and the respiratory motion curve in the present invention is as follows:

[0054] The target object is scanned using respiratory gating-controlled CT equipment. The position of the original projection data on the respiratory motion curve is obtained using the time when the X-ray tube emits rays and the movement data of the loading bed. The original projection data is then reconstructed into a CT image, and the reconstructed CT image is marked on the respiratory motion curve according to the position of the original projection data on the curve.

[0055] The operation of determining the puncture time for the target tissue in the present invention is as follows:

[0056] The breathing of the target object is monitored in real time and a dynamic respiratory motion curve is obtained. The respiratory motion curve of the identified CT image of S3 is used as a reference image, and the real-time dynamic respiratory motion curve is fitted with the reference respiratory motion curve image. When the real-time dynamic respiratory motion curve is located in the target tissue within the identified area of ​​the reference respiratory motion curve image, where the area range is ±2.5% of the target tissue image identification point, the puncture time for the target tissue is determined.

[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0058] In the description of this application, it should be noted that the terms "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0059] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or vertical, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0060] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A CT-guided chest and abdominal puncture guidance method for reducing the influence of respiratory motion, characterized in that: The following steps are involved: S1. Obtaining a respiratory motion curve of a target subject in a free breathing state; S2, when the target object is in a free breathing state, according to the respiratory motion curve, the target tissue is scanned by controlling the CT imaging device through respiratory gating in the curve area to obtain its CT scan image, and the area scanned in the respiratory motion curve is marked as time domain t1; S3, matching the CT image in S2 with the respiratory motion curve in S1, marking the scanning time of each CT image on the respiratory motion curve in S1, and using the marked curve as a reference curve at the puncture time; S4, determining the surface needle insertion position for puncturing the target tissue according to the CT image obtained in S2; S5. During puncture, the respiratory movement of the target object is monitored and a respiratory movement curve is obtained. When the respiratory movement curve is located at the target tissue image identification point in the reference movement curve in S3, the puncture time for the target tissue is determined.

2. A CT-guided chest and abdominal puncture guidance method for reducing the influence of respiratory motion according to claim 1, characterized in that: In the above S5, during the puncture process, when the target tissue needs to be repeatedly CT scanned, the scan is started in the respiratory motion curve time domain t1 through respiratory gating control.

3. The method for guiding thoracic and abdominal puncture under CT guidance to reduce the influence of respiratory motion according to claim 1, characterized in that: In S1, a contact monitoring method or a non-contact monitoring method is used to monitor the respiratory signal, and a respiratory motion curve of the target object in a free breathing state is obtained.

4. The method for guiding thoracic and abdominal puncture under CT guidance to reduce the influence of respiratory motion according to claim 1, characterized in that: The CT scan image in S2 is scanned by a CT scanning device.

5. The method for guiding thoracic and abdominal puncture under CT guidance to reduce the influence of respiratory motion according to claim 4, characterized in that: CT scanning equipment includes CT imaging device and central software control device. The CT imaging device includes an opposing X-ray tube, a flat panel detector, and a loading bed frame located between the X-ray tube and the flat panel detector; The loading bed is used to fix the imaging target, and its operation process is as follows: When acquiring CT images, the loading bed is kept fixed, and the X-ray tube and flat panel detector are rotated around the load to adjust the acquisition angle; The central software control device is used to receive the respiratory signal of the imaging target and control the CT imaging device to scan and image the target tissue through respiratory gating according to the set time domain parameters.

6. The method for guiding thoracic and abdominal puncture under CT guidance to reduce the influence of respiratory motion according to claim 1, characterized in that: The matching operation between CT image and respiratory motion curve is as follows: The target object is scanned using respiratory gating-controlled CT equipment. The position of the original projection data on the respiratory motion curve is obtained using the time when the X-ray tube emits rays and the movement data of the loading bed. The original projection data is then reconstructed into a CT image, and the reconstructed CT image is marked on the respiratory motion curve according to the position of the original projection data on the curve.

7. The method for guiding thoracic and abdominal puncture under CT guidance to reduce the influence of respiratory motion according to claim 1, characterized in that: The operation to determine the puncture time for the target tissue is as follows: The breathing of the target object is monitored in real time and a dynamic respiratory motion curve is obtained. The respiratory motion curve of the identified CT image of S3 is used as a reference image, and the real-time dynamic respiratory motion curve is fitted with the reference respiratory motion curve image. When the real-time dynamic respiratory motion curve is located in the target tissue within the identified area of ​​the reference respiratory motion curve image, where the area range is ±2.5% of the target tissue image identification point, the puncture time for the target tissue is determined.

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