A ct-guided thoraco-abdominal puncture guidance method with reduced respiratory motion influence

Abstract

The application relates to a CT-guided chest and abdomen puncture guiding method for reducing the influence of respiratory motion, which comprises the following steps: S1, acquiring a respiratory motion curve of a target object in a free breathing state; S2, in the free breathing state of the target object, according to the respiratory motion curve, a CT imaging device is controlled to scan the target tissue in a curve region of the respiratory motion curve through respiratory gating, and a CT scan image of the target tissue is obtained; S3, matching the CT image in S2 with the respiratory motion curve in S1, and taking the marked curve as a reference curve at a puncture moment; S4, determining a body surface needle insertion position of a puncture target tissue according to the CT image obtained in S2; and S5, monitoring the respiratory motion of the target object during puncture and obtaining a respiratory motion curve, and determining the puncture moment of the target tissue when the respiratory motion curve is located at a target tissue image mark point in the reference motion curve in S3. The application can improve the puncture accuracy.

Description

Technical Field

[0001] This invention relates to the field of medical image processing technology, and more particularly to a CT-guided method for guiding thoracotomy and abdominal puncture to reduce the influence of respiratory motion. Background Technology

[0002] CT-guided percutaneous puncture to access lesions in the chest or abdomen of a target patient for biopsy or treatment can achieve the purpose of obtaining diseased tissue or eliminating lesions. However, because the target patient's breathing causes the lesion in the chest or abdomen to move, the lesion's position may vary at different times, easily leading to puncture errors. Therefore, determining the timing of the puncture based on the target patient's breathing and minimizing the adverse effects of respiratory movement is of great importance.

[0003] Currently, some methods reduce respiratory movements by having the subject hold their breath during CT scans and punctures. However, the puncture process requires multiple CT scans, and it is difficult for the subject to cooperate and hold their breath at a consistent intensity for each scan. Furthermore, the puncture process is lengthy, making it difficult for the subject to cooperate with holding their breath for extended periods.

[0004] Chinese Patent No. 2024103028229 discloses a method and related products for determining the puncture time based on respiratory monitoring. It uses ultrasound image sequences and three-dimensional CT image sequences to determine the movement pattern of the target tissue and identify the time corresponding to the target's movement state as the target time. The ultrasound images in this system are obtained by ultrasound equipment, but because the lungs are primarily filled with gas, ultrasound waves cannot be transmitted within the gas, so the ultrasound equipment cannot obtain images of lung lesions. This system matches ultrasound images with CT images; however, in practice, ultrasound examinations and CT scans are often not on the same plane, making the matching of ultrasound images and three-dimensional CT images difficult, prone to errors, and the process cumbersome, time-consuming, and susceptible to the target subject involuntarily changing position.

[0005] Therefore, achieving effective, convenient, and highly cooperative CT-guided puncture to reduce the adverse effects of respiratory movement on the chest and abdomen is a bottleneck problem that urgently needs to be solved in this field. Summary of the Invention

[0006] To address the aforementioned technical problems, the purpose of this invention is to provide a CT-guided method for guiding thoracoabdominal punctures that reduces the impact of respiratory movements.

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

[0008] A CT-guided method for guiding thoracoabdominal puncture to reduce the impact of respiratory motion includes the following steps:

[0009] S1. Obtain the respiratory motion curve of the target object under free breathing state;

[0010] S2. Under the free breathing state of the target object, according to the respiratory motion curve, the CT imaging device is scanned in the curve area by respiratory gating to obtain its CT scan image, and the area scanned in the respiratory motion curve is marked as time domain t1.

[0011] S3. Match the CT images in S2 with the respiratory motion curve in S1, mark the scanning time of each CT image on the respiratory motion curve in S1, and use the marked curve as the reference curve for the puncture time.

[0012] S4. Determine the needle insertion point on the body surface of the target tissue based on the CT images obtained in S2;

[0013] S5. Monitor the respiratory movement of the target subject during puncture and obtain the respiratory movement curve. When the respiratory movement curve is located at the target tissue image marker point in the S3 reference movement curve, determine the puncture time for the target tissue.

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

[0015] Preferably, in the CT-guided thoracoabdominal puncture guidance method for reducing the influence of respiratory motion, step S1 uses either contact monitoring or non-contact monitoring to monitor respiratory signals and obtain the respiratory motion curve of the target subject under free breathing conditions.

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

[0017] Preferably, the CT-guided thoracoabdominal puncture guidance method for reducing the influence of respiratory movements includes a CT scanning device comprising a CT imaging unit and a central software control unit.

[0018] The CT imaging equipment includes opposing X-ray tubes, a flat panel detector, and a bed frame located between the X-ray tubes and the flat panel detector.

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

[0020] During CT image acquisition, keep the medical bed frame fixed, and rotate the X-ray tube and flat panel detector around the medical bed to adjust the acquisition angle.

[0021] The central software control unit 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, the CT-guided thoracoabdominal puncture guidance method for reducing the influence of respiratory motion involves the following steps for matching CT images with respiratory motion curves:

[0023] The CT scanner is used to scan the target object by using respiratory gating. The position of the original projection data on the respiratory motion curve is obtained by using the time when the X-ray tube emits the radiation and the movement data of the bed frame. Then, the original projection data is 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, the CT-guided thoracoabdominal puncture guidance method for reducing the influence of respiratory movements determines the puncture time for the target tissue as follows:

[0025] Real-time monitoring of the target subject's breathing and obtaining dynamic respiratory motion curves are performed. The respiratory motion curve of the S3-identified CT image is used as a reference image. The real-time dynamic respiratory motion curve is fitted to the reference respiratory motion curve image. When the real-time dynamic respiratory motion curve is located within the target tissue within the area identified by the reference respiratory motion curve image, the area range is ±2.5% of the target tissue image identification point, which is determined as the puncture time for the target tissue.

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

[0027] This invention effectively and conveniently reduces the adverse effects of respiratory motion during CT-guided punctures in the chest and abdomen, while also minimizing artifacts caused by respiratory motion, thereby improving puncture accuracy.

[0028] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a flowchart of the present invention;

[0031] Figure 2 These are CT scan images of the present invention;

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

[0033] Figure 4 This is a diagram showing the relationship between the CT scan image and the respiratory motion curve of this invention;

[0034] Figure 5 This is a diagram showing that the puncture time can be confirmed in step S5 of the present invention;

[0035] Figure 6 This is a diagram showing that the puncture time cannot be confirmed in S5 of the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0038] Example

[0039] like Figures 1 to 6 As shown, a CT-guided method for guiding thoracoabdominal puncture to reduce the influence of respiratory motion includes the following steps:

[0040] S1. Obtain the respiratory motion curve of the target object under free breathing state;

[0041] S2. Under the free breathing state of the target object, according to the respiratory motion curve, the CT imaging device is scanned in the curve area by respiratory gating to obtain its CT scan image, and the area scanned in the respiratory motion curve is marked as time domain t1.

[0042] S3. Match the CT images in S2 with the respiratory motion curve in S1, mark the scanning time of each CT image on the respiratory motion curve in S1, and use the marked curve as the reference curve for the puncture time.

[0043] S4. Determine the needle insertion point on the body surface of the target tissue based on the CT images obtained in S2;

[0044] S5. Monitor the respiratory movement of the target subject during puncture and obtain the respiratory movement curve. When the respiratory movement curve is located at the target tissue image marker point in the S3 reference movement curve, determine the puncture time for the target tissue.

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

[0046] In the present invention, S1 uses either contact monitoring or non-contact monitoring to monitor respiratory signals and obtain the respiratory motion curve of the target object under free breathing state.

[0047] In this invention, the CT scan image in S2 is scanned and imaged using a CT scanning device.

[0048] The CT scanning equipment in this invention includes a CT imaging device and a central software control device.

[0049] The CT imaging equipment includes opposing X-ray tubes, a flat panel detector, and a bed frame located between the X-ray tubes and the flat panel detector.

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

[0051] During CT image acquisition, keep the medical bed frame fixed, and rotate the X-ray tube and flat panel detector around the medical bed to adjust the acquisition angle.

[0052] The central software control unit 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 between CT images and respiratory motion curves in this invention is as follows:

[0054] The CT scanner is used to scan the target object by using respiratory gating. The position of the original projection data on the respiratory motion curve is obtained by using the time when the X-ray tube emits the radiation and the movement data of the bed frame. Then, the original projection data is 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 procedure for determining the puncture time for the target tissue in this invention is as follows:

[0056] Real-time monitoring of the target subject's breathing and obtaining dynamic respiratory motion curves are performed. The respiratory motion curve of the S3-identified CT image is used as a reference image. The real-time dynamic respiratory motion curve is fitted to the reference respiratory motion curve image. When the real-time dynamic respiratory motion curve is located within the target tissue within the area marked by the reference respiratory motion curve image, where the area range is ±2.5% of the target tissue image mark point, the puncture time for the target tissue is determined.

[0057] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0058] In the description of this application, it should be noted that the terms "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0059] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or vertical, but rather that they can be slightly tilted. For example, "horizontal" simply 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 expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A CT-guided method for guiding thoracoabdominal puncture to reduce the influence of respiratory motion, characterized in that, Includes the following steps: S1. Obtain the respiratory motion curve of the target object under free breathing state; S2. Under the free breathing state of the target object, according to the respiratory motion curve, the CT scanning device is controlled by respiratory gating in the curve area to scan the target tissue and obtain its CT scan image. At the same time, the area scanned in the respiratory motion curve is marked as time domain t1. S3. Match the CT images in S2 with the respiratory motion curve in S1, mark the scanning time of each CT image on the respiratory motion curve in S1, and use the marked curve as the reference curve for the puncture time. S4. Determine the needle insertion point on the body surface of the target tissue based on the CT images obtained in S2; S5. Monitor the respiratory movement of the target subject during puncture and obtain the respiratory movement curve. When the respiratory movement curve is located at the target tissue image marker point in the S3 reference movement curve, determine the puncture time for the target tissue. CT scanning equipment includes a CT imaging unit and a central software control unit. The CT imaging device includes opposing X-ray tubes, a flat panel detector, and a bed frame located between the X-ray tubes and the flat panel detector. The transport bed frame is used to fix the imaging target, and its operation process is as follows: During CT image acquisition, the medical bed frame is kept fixed, and the X-ray tube and flat panel detector are rotated around the medical bed frame to adjust the acquisition angle. The central software control unit 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; The procedure for matching CT images with respiratory motion curves is as follows: The CT scanning equipment is controlled by respiratory gating to scan the target object. The position of the original projection data on the respiratory motion curve is obtained by using the time when the X-ray tube emits the radiation and the movement data of the bed frame. Then, the original projection data is 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. The procedure for determining the puncture time for the target tissue is as follows: Real-time monitoring of the target's respiration and obtaining dynamic respiratory motion curves. Using the respiratory motion curve of the S3-identified CT image as a reference image, the real-time dynamic respiratory motion curve is fitted to the reference respiratory motion curve image. When the real-time dynamic respiratory motion curve is located within the target tissue within the area identified by 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. In S5, when the target tissue needs to be scanned repeatedly during the puncture process, the scan is initiated within the time domain t1 of the respiratory motion curve through respiratory gating control.

2. The CT-guided method for thoracoabdominal puncture guidance to reduce the influence of respiratory motion as described in claim 1, characterized in that: In S1, either contact monitoring or non-contact monitoring is used to monitor respiratory signals and obtain the respiratory motion curve of the target object under free breathing conditions.

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