Imaging method and device for interventional operation, storage medium and equipment

Abstract

The invention discloses an imaging method and device for an interventional operation, a storage medium and equipment. Comprising the following steps: acquiring an initial perspective image of a target area generated by medical imaging equipment according to current ray parameters; for each target object, determining the proportion of the image corresponding to the target object in the initial perspective image, and taking the proportion as the image proportion corresponding to the target object; wherein the target objects comprise different components of the interventional surgical instrument and different types of vascular structures; according to the image proportion corresponding to each target object and the overlapping condition between the images corresponding to each target object, determining a current intervention operation state; and determining a target ray parameter matched with the interventional operation state, and updating the current ray parameter through the target ray parameter, so that the medical imaging equipment performs imaging on the target area based on the target ray parameter.

Description

Technical Field

[0001] This application relates to the field of medical imaging technology, and in particular to an imaging method, device, storage medium and equipment for interventional surgery. Background Technology

[0002] In modern medical diagnosis and treatment systems, medical imaging equipment, as a core tool for acquiring information on the internal anatomical structure, physiological function, and lesions of the human body, has become an indispensable and crucial component of clinical diagnosis and treatment processes. Among them, digital subtraction angiography (DSA) technology, as one of the core technologies in the field of vascular imaging, is widely used in clinical diagnosis and treatment scenarios due to its advantage of clearly displaying the course of blood vessels, changes in vessel diameter, and the location of lesions, providing important evidence for the diagnosis and interventional treatment of vascular diseases.

[0003] During DSA imaging, X-rays are typically emitted through the X-ray tube of the DSA device. After penetrating the human body, the rays are received by the detector, thus obtaining the fluoroscopic images required during the surgery.

[0004] However, existing DSA imaging methods mostly use fixed radiation parameters, that is, the radiation tube emits radiation with uniform parameters throughout the entire interventional procedure. This results in the radiation dose being unable to adapt to the entire interventional procedure and making it difficult to meet the clinical diagnostic needs of interventional surgery. Summary of the Invention

[0005] This application provides an imaging method for interventional surgery, comprising: Acquire an initial fluoroscopic image of the target area generated by a medical imaging device based on current X-ray parameters; For each target object, the proportion of the image corresponding to that target object in the initial fluoroscopic image is determined as the image proportion corresponding to that target object; wherein, the target object includes: different types of vascular structures and different components of interventional surgical instruments; The current intervention operation status is determined based on the image proportion of each target object and the overlap of the images of each target object in the initial perspective image. A target ray parameter matching the interventional procedure state is determined, and the current ray parameter is updated using the target ray parameter so that the medical imaging device can image the target area based on the target ray parameter.

[0006] Optionally, for each target object, the proportion of the image corresponding to that target object in the initial perspective image is determined, specifically including: Each target object is segmented by masking in the initial perspective image to obtain a mask image corresponding to each target object; For each target object, the image proportion corresponding to that target object is determined based on the pixel area ratio between the mask image corresponding to the target object and the initial perspective image.

[0007] Optionally, the different components of the interventional surgical instrument include: a guidewire and a catheter; The current intervention status is determined based on the image proportion of each target object and the overlap between the images of each target object, specifically including: If the proportion of the image corresponding to the guidewire is greater than the proportion of the first image, and does not overlap with the image corresponding to the catheter or at least some of the images corresponding to the vascular structures, then the current interventional operation state is determined to be the guidewire advancement state. If the proportion of the image corresponding to the catheter is greater than the proportion of the second image, and the image overlap rate between the catheter and the image corresponding to the guidewire is greater than the preset overlap rate, then the current interventional operation state is determined to be the catheter follow-up state.

[0008] Optionally, the different types of vascular structures include at least one of: vascular wall structure, vascular bifurcation structure, and vascular stenosis structure; The current intervention status is determined based on the image proportion of each target object and the overlap between the images of each target object, specifically including: If the initial fluoroscopic image contains an image corresponding to the blood vessel wall structure, the proportion of the image corresponding to the blood vessel wall structure is greater than the proportion of the third image, and the initial fluoroscopic image does not contain an image corresponding to the component of the interventional surgical instrument, then the interventional operation state is determined to be the blood vessel wall observation state. If the initial fluoroscopic image contains an image corresponding to a blood vessel bifurcation structure, the proportion of the image corresponding to the blood vessel bifurcation structure is greater than the fourth proportion, and the distance between the components of the interventional surgical instrument and the bifurcation structure is less than a preset distance, then the interventional operation state is determined to be a bifurcation structure operation state. If the initial fluoroscopic image contains an image corresponding to a vascular stenosis structure, the proportion of the image corresponding to the vascular stenosis structure is greater than the fifth proportion, and the image corresponding to the component of the interventional surgical instrument covers the image corresponding to the vascular stenosis structure, then the interventional operation state is determined to be a stenosis structure operation state.

[0009] Optionally, the target radiation parameters include: the target tube current and the target tube voltage of the radiation tube of the medical imaging device.

[0010] Determining the target ray parameters that match the intervention operation state specifically includes: Determine the reference tube current and reference tube voltage corresponding to the medical imaging device; The current ratio and voltage ratio are determined based on the preset mapping relationship between different intervention operation states and the proportion of different X-ray parameters; The target transistor current is determined based on the reference transistor current and the current ratio, and the target transistor voltage is determined based on the reference transistor voltage and the voltage ratio.

[0011] Optionally, determining the target ray parameters that match the intervention operation state specifically includes: Determine the target radiation dose level that matches the interventional procedure status; Based on the target radiation dose level and the mapping relationship between each radiation dose level and different radiation parameters, the target radiation parameters are determined so as to adjust the radiation dose rate of the radiation emitted by the medical imaging device during the imaging process.

[0012] Optionally, determining the target radiation dose level that matches the interventional procedure status specifically includes: If the interventional operation status is the blood vessel wall observation status, then the target radiation dose level is determined to be the first dose level; If the interventional operation status is the guidewire recommended status or the catheter follow-up status, then the target radiation dose level is determined to be the second dose level; If the intervention operation state is the bifurcation structure operation state or the narrow structure operation state, then the target radiation dose level is determined to be the third dose level; Wherein, the radiation dose rate corresponding to the first dose level is lower than that of the second dose level, and the radiation dose rate corresponding to the third dose level is higher than that of the second dose level.

[0013] This specification provides an imaging device for interventional surgery, comprising: The acquisition module is used to acquire the initial fluoroscopic image of the target area generated by the medical imaging equipment based on the current X-ray parameters; The segmentation module is used to determine the proportion of the image corresponding to each target object in the initial fluoroscopic image, which is taken as the image proportion corresponding to the target object; wherein, the target objects include: different components of interventional surgical instruments and different types of vascular structures; The determination module is used to determine the current intervention operation status based on the image proportion of each target object and the overlap of the images of each target object in the initial perspective image; An imaging module is used to determine target X-ray parameters that match the interventional operation state, and to update the current X-ray parameters using the target X-ray parameters, so that the medical imaging device can image the target area based on the target X-ray parameters.

[0014] This specification provides a computer-readable storage medium having computer instructions stored thereon that, when executed by a processor, implement the steps of the method described above.

[0015] This specification provides an imaging device including a processor and a memory for storing executable instructions of the processor, the processor being configured to perform the steps of the method described above.

[0016] The technical solutions provided by the embodiments of this application may include the following beneficial effects: The process involves acquiring an initial fluoroscopic image of the target region generated by a medical imaging device based on current X-ray parameters; determining the proportion of the image corresponding to each target object within the initial fluoroscopic image, which is used as the image proportion corresponding to that target object; where target objects include different components of interventional surgical instruments and different types of vascular structures; determining the current interventional operation status based on the image proportions corresponding to each target object and the overlap between the images corresponding to each target object; determining target X-ray parameters that match the interventional operation status, and updating the current X-ray parameters using the target X-ray parameters, so that the medical imaging device can image the target region based on the target X-ray parameters.

[0017] In this method, an initial fluoroscopic image is first generated using the current X-ray parameters. Then, the current interventional procedure status is determined by the proportion of the target object in the initial fluoroscopic image and the overlap between target objects. This allows for the determination of target X-ray parameters consistent with the current surgical stage, controlling the medical imaging equipment to perform imaging based on this interventional procedure status. Compared to current methods that use fixed X-ray parameters, this method allows for further updating of X-ray parameters by determining the current interventional procedure status, achieving a dynamic balance between radiation safety and image quality, and fully meeting the clinical diagnostic needs of interventional surgery. Attached Figure Description

[0018] Figure 1 This is a schematic flowchart of an imaging method for interventional surgery provided in an embodiment of this application; Figure 2 This is a schematic diagram of the radiation dose adjustment process of a medical imaging device provided in an embodiment of this application; Figure 3 This is a schematic diagram of an imaging device for interventional surgery provided in an embodiment of this application; Figure 4This application provides a corresponding embodiment. Figure 1 A schematic diagram of the structure of an electronic device. Detailed Implementation

[0019] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The modes described in the following exemplary embodiments do not represent all modes consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0020] During interventional surgery, images of blood vessels, guidewires, and instruments need to be displayed in real time through exposure to determine the specific location of the guidewire and the surrounding conditions, providing crucial guidance for procedures such as balloon dilation and stent implantation.

[0021] However, there is an inherent contradiction between DSA imaging quality and radiation dose: while high radiation dose can improve image clarity, it increases the risk of radiation exposure for medical staff and patients; low radiation dose may result in unclear images due to image noise, making it difficult to provide accurate surgical reference.

[0022] Most mainstream DSA devices are equipped with Automatic Exposure Control (AEC), which automatically adjusts tube voltage and current parameters by detecting the overall brightness of the image or the attenuation value of a specific area. However, AEC lacks the ability to sense the progress and critical stages of the surgical procedure, relying solely on global grayscale feedback to adjust the dose. It cannot identify critical operational scenarios such as guidewire passing through vascular bifurcation or catheter positioning of stenotic segments. Therefore, it cannot proactively increase the exposure dose to ensure the signal-to-noise ratio of critical structures, and the blurring of image details can increase the risk of instrument misoperation.

[0023] Based on this, this specification provides an imaging method for interventional surgery. First, an initial fluoroscopic image is generated using the current X-ray parameters. Then, the current interventional operation state is determined by the proportion of the target object in the initial fluoroscopic image and the overlap between the target objects. Subsequently, target X-ray parameters matching the current interventional operation state are determined to control the medical imaging equipment to perform imaging, thereby achieving a dynamic balance between radiation safety and imaging quality, and further meeting the clinical diagnostic needs of interventional surgery.

[0024] The embodiments of this application will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0025] Figure 1This is a schematic flowchart of an imaging method for interventional surgery provided in an embodiment of this application, including the following steps: S101: Acquire an initial fluoroscopic image of the target area generated by the medical imaging equipment based on the current X-ray parameters.

[0026] In this specification, the executing entity for performing the imaging method for interventional surgery can be the control unit, control terminal, or the medical imaging device itself of the medical imaging equipment. Of course, it can also be a server or host computer with data processing and control functions. For ease of description, the following will use the control unit as the executing entity to explain the imaging method for interventional surgery provided in this specification.

[0027] The control unit can acquire the initial fluoroscopic image of the target area generated by the medical imaging equipment based on the current X-ray parameters.

[0028] The target area can be the blood vessels and surrounding tissues in the patient's body during interventional surgery. The radiation parameters include the tube current (mA) and tube voltage (kV) of the X-ray tube of the medical imaging equipment. These radiation parameters are used to determine the radiation dose rate of the medical imaging equipment (i.e., the radiation dose emitted per unit time). The higher the tube current and tube voltage, the higher the radiation dose rate, and vice versa.

[0029] Medical imaging equipment can emit rays through a ray generator based on the current ray parameters. After the rays penetrate the target area of ​​the patient, they are received by the detector. After signal conversion and image processing, an initial fluoroscopic image is obtained.

[0030] In practical applications, the ray parameters when the medical imaging device acquires the first frame of the initial fluoroscopic image can be the preset initial ray parameters. The ray parameters when acquiring the Nth (N≥2)th frame of the initial fluoroscopic image are the target ray parameters determined based on the N-1th frame of the initial fluoroscopic image. The method for determining the target ray parameters is detailed below and will not be elaborated on here.

[0031] The aforementioned medical imaging equipment can be a DSA device, which emits X-rays. Of course, the aforementioned medical imaging equipment can also be a computed tomography (CT) device, a digital radiography (DR) device, a mammography machine, or other devices. This manual does not make any specific limitations on this.

[0032] In addition, the initial fluoroscopic image mentioned above can be a vascular fluoroscopic image after subtraction processing. This image removes soft tissue interference such as bone, muscle, and fat, and retains only the target structures such as blood vessels, guide wires, and catheters, making it suitable for image observation throughout the entire surgical cycle.

[0033] S102: For each target object, determine the proportion of the image corresponding to the target object in the initial fluoroscopic image, as the image proportion corresponding to the target object; wherein, the target object includes: different types of vascular structures and different components of interventional surgical instruments.

[0034] For each target object to be observed during interventional surgery, the control unit can perform masking segmentation on the initial fluoroscopic image to obtain a mask image corresponding to that target object. This mask image refers to masking the background area in the initial fluoroscopic image excluding the target object, retaining only the image of the target object that needs to be observed in the interventional surgery.

[0035] The target objects may include different types of vascular structures and different components of interventional surgical instruments. The different types of vascular structures include one or more of the following: vascular wall structures, vascular bifurcation structures, and vascular stenosis structures. The different components of interventional surgical instruments include: guidewires for establishing and guiding vascular access, and catheters for contrast agent delivery and instrument introduction.

[0036] The mask image corresponding to the guidewire can include the main body and end region of the guidewire; the mask image corresponding to the catheter includes the outer wall and lumen region of the catheter; the mask image corresponding to the vascular wall structure includes the inner and outer walls of the target vascular vessel and clearly defines the vascular orientation; the mask image corresponding to the vascular bifurcation structure includes the vascular bifurcation region and bifurcation location information; and the vascular stenosis structure includes the location of the stenotic segment of the vascular lumen.

[0037] Taking the guidewire as an example, the vascular structure and other objects such as the catheter are masked in its corresponding mask image, and only the image corresponding to the guidewire is retained.

[0038] For each target object, the control unit can determine the image proportion corresponding to the target object based on the pixel area ratio between the mask image and the initial perspective image corresponding to the target object.

[0039] Taking a catheter as an example, if the total number of pixels in the initial fluoroscopic image is 1 million and the number of pixels in the mask image corresponding to the catheter is 200,000, then the proportion of the image corresponding to the catheter is 20%.

[0040] In practical applications, the control unit can first perform image recognition on each target object in the initial perspective image, and then perform image segmentation processing based on the recognition results.

[0041] At least some of the target objects use different image recognition methods.

[0042] Specifically, the identification of guidewires and catheters relies on the high brightness characteristics of their materials in DSA images. Therefore, the high-brightness candidate regions in the initial fluoroscopic image are first segmented using adaptive thresholding. Then, morphological opening operations are used to repair these candidate regions: erosion operations eliminate scattered noise points, and dilation operations reconstruct noisy or unevenly visualized guidewire / catheter images, restoring their continuous morphology. Finally, geometric information and grayscale features such as aspect ratio, average gray value, and edge continuity are used for screening. Long, thin structures with extremely high brightness are identified as guidewires, while thicker structures following the direction of the blood vessel are identified as catheters.

[0043] The identification of the blood vessel wall aims to delineate the inner and outer boundaries of the vessel. Therefore, an algorithm using the Canny edge detector can capture intensity abrupt changes in the initial perspective image through a dual-threshold strategy, thereby obtaining all potential edges, including the blood vessel wall. This process can leverage the continuity and smoothness of the blood vessel: first, Hough transform is used to detect straight lines and smooth curves in the image, filtering out edge segments that conform to the natural course of the blood vessel; then, polynomial curve fitting is performed on these candidate edge points to reconstruct a smooth and continuous contour of the inner and outer walls of the blood vessel.

[0044] The identification of vascular bifurcation structures is based on the analysis of vascular topology. First, the vascular region is identified. Then, the identified vascular region is extracted using skeletonization, resulting in a single-pixel-wide skeleton line reflecting the direction of the vascular center. Topologically, bifurcation is represented by connection points on the skeleton line, typically connecting three or more branches. The eight-neighbor connectivity of each pixel on the skeleton line is analyzed to determine if these bifurcation points are vascular bifurcation structures: a point connecting three or more directions is marked as a potential bifurcation point. Further calculation of the angles between branches is then performed, filtering out points with angles within a preset physiological vascular bifurcation range (e.g., 30°-150°). Points with angles too small (e.g., <15°) or too large (e.g., >165°) are removed, thus eliminating false bifurcations caused by skeletal edges or noise, and identifying genuine vascular bifurcation structures.

[0045] Identification of vascular stenosis structures can be achieved by measuring changes in vessel diameter. First, the vessel's centerline (skeleton) is identified. Then, along this centerline, measurements are taken at fixed intervals, calculating the vessel diameter perpendicular to the centerline at each point. By analyzing the overall vessel profile and selecting the normal vessel diameter as a baseline reference, the relative stenosis rate at the stenosis site can be calculated. When the local diameter is less than 70% of the baseline diameter (i.e., stenosis rate > 30%), the vessel segment is marked as a clinically significant vascular stenosis structure, and its location information is output for subsequent image segmentation processing.

[0046] Of course, the identification and image segmentation of target objects can also be achieved through a pre-trained instance segmentation model, that is, by inputting the initial perspective image into the instance segmentation model, and then using the instance segmentation model to determine the mask images corresponding to different target objects.

[0047] Furthermore, to ensure the rationality and robustness of the recognition results, the characteristics of continuous imaging of DSA images can be utilized to perform time-series filtering on the image recognition results of consecutive frames, filtering out jitter caused by noise and ensuring that the output results remain stable and reliable in the time dimension.

[0048] It should be noted that compared to the direct observation by doctors during interventional surgery, the image recognition and image segmentation processes require less detail and visual contrast. Therefore, even the initial fluoroscopic images generated by low-dose radiation can meet the algorithm requirements for vascular region recognition, skeleton extraction, and bifurcation point detection. This effectively reduces the radiation dose received by patients and medical staff and improves the safety of interventional surgery while ensuring that the imaging quality meets the needs of clinical diagnosis and surgical guidance.

[0049] In addition, to ensure accurate identification and segmentation of each target object, the minimum radiation dose rate of the medical imaging equipment shall not be less than the radiation dose rate corresponding to the target image clarity required for accurate segmentation of each target object in the fluoroscopic image.

[0050] S103: Determine the current intervention operation status based on the image proportion of each target object and the overlap of the images of each target object in the initial perspective image.

[0051] The control unit can determine the current intervention operation status based on the image proportion of the target object and the overlap of the images of each target object in the initial perspective image.

[0052] In practical applications, interventional procedures can include: guidewire advancement (slowly pushing the guidewire along the vascular pathway to the target area, using real-time imaging to confirm whether the guidewire's course conforms to the blood vessel and avoids the lesion site), catheter follow-up (using the positioned guidewire as a guide to advance the catheter along the guidewire path, ensuring the catheter port accurately reaches the lesion segment or target branch vessel), vessel wall observation (adjusting imaging parameters to focus on the vessel wall area, observing whether there are structural changes such as thickening, calcification, plaque rupture, or abnormal protrusions), bifurcation structure operation (for vessel bifurcation, controlling the guidewire or catheter to accurately enter the target branch vessel from the main vessel, avoiding the device from entering other branches or damaging the bifurcation site), and stenosis structure operation (in stenosis segments, using imaging to determine the degree of stenosis, performing device operations such as balloon dilation and stent implantation, while monitoring the patency of the vessel after the operation).

[0053] Specifically, if the proportion of the image corresponding to the guidewire is greater than that of the first image, and it does not overlap with the image corresponding to the catheter or the image corresponding to at least some vascular structures (such as vascular bifurcation structures and vascular stenosis structures), then the current interventional operation state is determined to be the guidewire advancement state. If the proportion of the image corresponding to the catheter is greater than the proportion of the second image, and the image overlap rate between the catheter and the image corresponding to the guidewire is greater than the preset overlap rate, then the current interventional operation status is determined to be the catheter follow-up status. If the initial fluoroscopic image contains an image corresponding to the blood vessel wall structure, the proportion of the image corresponding to the blood vessel wall structure is greater than the proportion of the third image, and there is no image corresponding to the components of the interventional surgical instrument in the initial fluoroscopic image, then the interventional operation state is determined to be the blood vessel wall observation state. If the initial fluoroscopic image contains an image corresponding to a blood vessel bifurcation structure, the proportion of the image corresponding to the blood vessel bifurcation structure is greater than the fourth proportion, and the distance between the components of the interventional surgical instrument and the bifurcation structure is less than the preset distance, then the interventional operation state is determined to be the bifurcation structure operation state. If the initial fluoroscopic image contains an image corresponding to a vascular stenosis structure, the proportion of the image corresponding to the vascular stenosis structure is greater than the fifth proportion, and the image corresponding to the component of the interventional surgical instrument covers the image corresponding to the vascular stenosis structure, then the interventional operation state is determined to be the stenosis structure operation state.

[0054] The percentages of the first image, the second image, the third image, the fourth image, and the fifth image, in descending order, are as follows: percentage of the third image, percentage of the first image, percentage of the second image, percentage of the fourth image, and percentage of the fifth image.

[0055] In practical applications, the proportion of each image, the preset overlap rate, and the preset distance can be set according to the actual situation. Preferably, the proportion of the first image can be 30%, the proportion of the second image can be 20%, the proportion of the third image can be 50%, the proportion of the fourth image can be 15%, the proportion of the fifth image can be 10%, the preset overlap rate can be 60%, and the preset distance can be 30mm.

[0056] S104: Determine the target ray parameters that match the interventional operation state, and update the current ray parameters using the target ray parameters, so that the medical imaging device can image the target area based on the target ray parameters.

[0057] Once the current interventional operation status is determined, the control unit can further determine the target ray parameters that match the interventional operation status.

[0058] The aforementioned target radiation parameters include the target tube current and target tube voltage of the radiation tube of the medical imaging device. The control unit can first determine the reference tube current and reference tube voltage corresponding to the medical imaging device, and then determine the current ratio and voltage ratio according to the preset mapping relationship between different interventional operation states and different radiation parameter ratios. Then, based on the reference tube current and current ratio, the target tube current is determined, and based on the reference tube voltage and the voltage ratio, the target tube voltage is determined.

[0059] The aforementioned reference tube current and reference tube voltage can be standard values ​​of medical imaging equipment (e.g., kV=75, mA=15). These standard values ​​can be determined based on the patient's body thickness automatically measured by the medical imaging equipment and finely adjusted within a preset range.

[0060] In addition, the control unit can determine the target radiation dose level that matches the interventional operation status, and then determine the target radiation parameters based on the target radiation dose level and the mapping relationship between each radiation dose level and different radiation parameters, so as to adjust the radiation dose rate of the radiation emitted by the medical imaging equipment during the imaging process through the target radiation parameters.

[0061] In this specification, radiation dose levels may include a first dose level (low dose), a second dose level (medium dose), and a third dose level (high dose). The radiation dose rate corresponding to the first dose level is lower than that of the second dose level, and the radiation dose rate corresponding to the third dose level is higher than that of the second dose level. Of course, other radiation dose levels can be set in practical applications, and this specification does not specifically limit this.

[0062] If the control unit intervention operation status is the control unit blood vessel wall observation status, then the target radiation dose level of the control unit is determined to be the first dose level. If the control unit intervention operation status is the control unit guidewire recommendation status or the control unit catheter follow-up status, then the target radiation dose level of the control unit is determined to be the second dose level; If the control unit is in a bifurcated structure operation state or a narrow structure operation state, then the target radiation dose level of the control unit is determined to be the third dose level.

[0063] In practical applications, the control unit can determine the corresponding voltage ratio, current ratio, or radiation dose level based on a pre-trained neural network model. In this way, the intervention operation status can be input into the neural network model so that it outputs the corresponding voltage ratio, current ratio, or radiation dose level.

[0064] The correspondence between different interventional procedures, dose ratios, and dose levels is shown in Table 1. Table 1 After determining the target radiation parameters, the control unit can generate adjustment commands for tube voltage and tube current, and transmit them to the radiation generator of the medical imaging equipment via USB / CAN communication. After receiving the commands, the radiation generator adjusts the tube current and tube voltage within a processing cycle of ≤66ms (15fps frame rate) for each frame of image, thereby achieving dynamic optimization of the exposure dose.

[0065] In practical applications, each frame of fluoroscopic image can correspond to a processing cycle. The control unit can adjust the X-ray parameters of the X-ray generator within this processing cycle to ensure that the exposure parameter adjustment is synchronized with the surgical operation without significant delay.

[0066] For ease of understanding, this manual provides a schematic diagram of the radiation dose adjustment process for medical imaging equipment, such as... Figure 2 As shown.

[0067] The medical imaging equipment can acquire an initial fluoroscopic image based on the current X-ray parameters. After the control unit acquires the initial fluoroscopic image, it performs image segmentation processing on it. Based on the image segmentation processing results, it determines the proportion and overlap of the image corresponding to each target object in the initial fluoroscopic image, and then determines the current interventional operation status.

[0068] The control unit can determine the radiation dose ratio based on the interventional operation status, and adjust the current radiation parameters according to the radiation dose ratio to obtain the target dose parameter, so that the medical imaging equipment can image the target area according to the target dose parameter.

[0069] It should be noted that the image acquisition process of DSA equipment includes two stages: the mask image acquisition stage and the contrast image acquisition stage after the injection of contrast agent. Afterwards, the images acquired in the two stages are processed into silhouette images (i.e., the initial fluoroscopic image) that include images of vascular structures and surgical instruments.

[0070] In this case, the ray parameters of the two stages can be adjusted simultaneously. Alternatively, mask images can be acquired using preset ray parameters, and the ray parameters of the contrast image acquisition stage can be dynamically adjusted only.

[0071] The above describes one or more detection methods for diseased sites as described in this manual. Based on the same approach, this manual also provides corresponding imaging devices for interventional procedures, such as... Figure 3 As shown.

[0072] Figure 3 A schematic diagram of an imaging device for interventional surgery provided in this specification includes: The acquisition module 301 is used to acquire an initial fluoroscopic image of the target area generated by the medical imaging device based on the current X-ray parameters; The segmentation module 302 is used to determine the proportion of the image corresponding to each target object in the initial fluoroscopic image, as the image proportion corresponding to the target object; wherein, the target objects include: different components of interventional surgical instruments and different types of vascular structures; The determining module 303 is used to determine the current intervention operation status based on the image proportion of each target object and the overlap of the images of each target object in the initial perspective image. The imaging module 304 is used to determine the target ray parameters that match the interventional operation state, and update the current ray parameters using the target ray parameters, so that the medical imaging device can image the target area based on the target ray parameters.

[0073] Optionally, the segmentation module 302 is specifically used to perform mask segmentation processing on each target object in the initial perspective image to obtain a mask image corresponding to each target object; and for each target object, determine the image proportion corresponding to the target object based on the pixel area ratio between the mask image corresponding to the target object and the initial perspective image.

[0074] Optionally, the different components of the interventional surgical instrument include: a guidewire and a catheter; The determining module 303 is specifically used to determine the current interventional operation state as guidewire advancement state if the image proportion corresponding to the guidewire is greater than the first image proportion and does not overlap with the image corresponding to the catheter and at least some of the images corresponding to the vascular structures; and to determine the current interventional operation state as catheter follow-up state if the image proportion corresponding to the catheter is greater than the second image proportion and the image overlap rate between the guidewire and the image is greater than the preset overlap rate.

[0075] Optionally, the different types of vascular structures include at least one of: vascular wall structure, vascular bifurcation structure, and vascular stenosis structure; The determining module 303 is specifically used to: determine the interventional operation state as a blood vessel wall observation state if the initial fluoroscopic image contains an image corresponding to a blood vessel wall structure, the proportion of the image corresponding to the blood vessel wall structure is greater than the proportion of the third image, and the initial fluoroscopic image does not contain an image corresponding to a component of the interventional surgical instrument; determine the interventional operation state as a bifurcation structure operation state if the initial fluoroscopic image contains an image corresponding to a blood vessel bifurcation structure, the proportion of the image corresponding to the blood vessel bifurcation structure is greater than the proportion of the fourth image, and the distance between the component of the interventional surgical instrument and the blood vessel bifurcation structure is less than a preset distance; determine the interventional operation state as a bifurcation structure operation state if the initial fluoroscopic image contains an image corresponding to a blood vessel stenosis structure, the proportion of the image corresponding to the blood vessel stenosis structure is greater than the proportion of the fifth image, and the image corresponding to a component of the interventional surgical instrument covers the image corresponding to the blood vessel stenosis structure.

[0076] Optionally, the target radiation parameters include: the target tube current and the target tube voltage of the radiation tube of the medical imaging device; The imaging module 304 is specifically used to: determine the reference tube current and reference tube voltage corresponding to the medical imaging device; determine the current ratio and voltage ratio according to a preset mapping relationship between different interventional operation states and different X-ray parameter ratios; determine the target tube current according to the reference tube current and the current ratio; and determine the target tube voltage according to the reference tube voltage and the voltage ratio.

[0077] Optionally, the imaging module 304 is specifically used to determine a target radiation dose level that matches the interventional operation state; and to determine the target radiation parameters based on the target radiation dose level and the mapping relationship between each radiation dose level and different radiation parameters, so as to adjust the radiation dose rate of the radiation emitted by the medical imaging device during the imaging process through the target radiation parameters.

[0078] Optionally, the imaging module 304 is specifically configured to: determine the target radiation dose level as a first dose level if the interventional operation state is the vessel wall observation state; determine the target radiation dose level as a second dose level if the interventional operation state is the guidewire recommendation state or the catheter follow-up state; and determine the target radiation dose level as a third dose level if the interventional operation state is the bifurcation structure operation state or the stenosis structure operation state; wherein the radiation dose rate corresponding to the first dose level is lower than that of the second dose level, and the radiation dose rate corresponding to the third dose level is higher than that of the second dose level.

[0079] This specification also provides a computer-readable storage medium storing a computer program that can be used to execute the above-described... Figure 1 An imaging method for interventional surgery is provided.

[0080] This instruction manual also provides Figure 4 The one shown corresponds to Figure 1 A schematic diagram of the imaging device. (See attached diagram.) Figure 4 At the hardware level, the electronic device includes a processor, internal bus, network interface, memory, and non-volatile memory, and may also include other hardware required for the business operations. The processor reads the corresponding computer program from the non-volatile memory into memory and then runs it to achieve the above-mentioned functions. Figure 1 The imaging method described herein is for interventional surgery. Of course, besides software implementation, this specification does not exclude other implementation methods, such as logic devices or a combination of hardware and software, etc. In other words, the execution entity of the following processing flow is not limited to individual logic units, but can also be hardware or logic devices.

[0081] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0082] For ease of description, the above devices are described in terms of function, divided into various units. Of course, in implementing this specification, the functions of each unit can be implemented in one or more software and / or hardware components.

[0083] Those skilled in the art will understand that embodiments of this specification can be provided as methods, systems, or computer program products. Therefore, this specification may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this specification may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0084] This specification is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this specification. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0085] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0086] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0087] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0088] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0089] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0090] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0091] Those skilled in the art will understand that the embodiments of this specification can be provided as methods, systems, or computer program products. Therefore, this specification may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this specification may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0092] This specification can be described in the general context of computer-executable instructions that are executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. This specification can also be practiced in distributed computing environments, where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0093] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0094] The above description is merely an embodiment of this specification and is not intended to limit this specification. Various modifications and variations can be made to this specification by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of the claims of this specification.

Claims

1. An imaging method for an interventional procedure, characterized in that, The method comprises: obtaining an initial perspective image of a target region generated by a medical imaging device according to current ray parameters; for each target object, determining the proportion of the image corresponding to the target object in the initial perspective image as the image proportion corresponding to the target object, wherein the target object includes different types of blood vessel structures and different components of an interventional surgical instrument; determining the current interventional operation state according to the image proportion corresponding to each target object and the overlap of the images corresponding to each target object in the initial perspective image; determining a target ray parameter matched with the interventional operation state, and updating the current ray parameter through the target ray parameter, so that the medical imaging device images the target region based on the target ray parameter.

2. The method of claim 1, wherein, For each target object, the proportion of the image corresponding to the target object in the initial perspective image is determined, specifically comprising: respectively performing mask segmentation processing on each target object in the initial perspective image to obtain a mask image corresponding to each target object; for each target object, determining the proportion of the image corresponding to the target object according to the pixel area proportion of the mask image corresponding to the target object and the initial perspective image.

3. The method of claim 1, wherein, The different components of the interventional surgical instrument include a guide wire and a catheter; determining the current interventional operation state according to the image proportion corresponding to each target object and the overlap between the images corresponding to each target object, specifically comprising: if the image proportion corresponding to the guide wire is greater than a first image proportion and does not overlap with the images corresponding to the catheter and at least part of the blood vessel structure, it is determined that the current interventional operation state is a guide wire advancing state; if the image proportion corresponding to the catheter is greater than a second image proportion, and the image overlap rate between the images corresponding to the guide wire is greater than a preset overlap rate, it is determined that the current interventional operation state is a catheter following state.

4. The method of claim 3, wherein, The different types of blood vessel structures include at least one of a blood vessel wall structure, a blood vessel bifurcation structure, and a blood vessel stenosis structure; determining the current interventional operation state according to the image proportion corresponding to each target object and the overlap between the images corresponding to each target object, specifically comprising: if the initial perspective image contains the image corresponding to the blood vessel wall structure, the image proportion corresponding to the blood vessel wall structure is greater than a third image proportion, and there is no image corresponding to the component of the interventional surgical instrument in the initial perspective image, it is determined that the interventional operation state is a blood vessel wall observation state; if the initial perspective image contains the image corresponding to the blood vessel bifurcation structure, the image proportion corresponding to the blood vessel bifurcation structure is greater than a fourth proportion, and the distance between the component of the interventional surgical instrument and the blood vessel bifurcation structure is less than a preset distance, it is determined that the interventional operation state is a bifurcation structure operation state; if the initial perspective image contains the image corresponding to the blood vessel stenosis structure, the image proportion corresponding to the blood vessel stenosis structure is greater than a fifth proportion, and the image corresponding to the component of the interventional surgical instrument covers the image corresponding to the blood vessel stenosis structure, it is determined that the interventional operation state is a stenosis structure operation state.

5. The method of claim 4, wherein, The target ray parameter includes a target tube current and a target tube voltage of a ray tube of the medical imaging device; The target ray parameter matched with the interventional operation state is determined, specifically including: A reference tube current and a reference tube voltage corresponding to the medical imaging device are determined; According to a preset mapping relationship between different interventional operation states and different ray parameter proportions, a current proportion and a voltage proportion are determined; The target tube current is determined according to the reference tube current and the current proportion, and the target tube voltage is determined according to the reference tube voltage and the voltage proportion.

6. The method of claim 4, wherein, The target ray parameter matched with the interventional operation state is determined, specifically including: A target ray dose level matched with the interventional operation state is determined; According to the target ray dose level and a mapping relationship between each ray dose level and different ray parameters, the target ray parameter is determined to adjust a ray dose rate of the ray emitted by the medical imaging device in the imaging process through the target ray parameter.

7. The method of claim 6, wherein, The target ray dose level matched with the interventional operation state is determined, specifically including: If the interventional operation state is the blood vessel wall observation state, the target ray dose level is determined as a first dose level; If the interventional operation state is the guide wire recommendation state or the catheter following state, the target ray dose level is determined as a second dose level; If the interventional operation state is the bifurcation structure operation state or the stenosis structure operation state, the target ray dose level is determined as a third dose level; The first dose level corresponds to a lower ray dose rate than the second dose level, and the third dose level corresponds to a higher ray dose rate than the second dose level.

8. An imaging apparatus for an interventional procedure, characterized by The method comprises: An acquisition module is configured to acquire an initial fluoroscopy image of a target region generated by a medical imaging device according to a current ray parameter; A segmentation module is configured to determine, for each target object, an image proportion of the target object in the initial fluoroscopy image as an image proportion of the target object, wherein the target object includes different components of an interventional surgical instrument and different types of blood vessel structures; A determination module is configured to determine a current interventional operation state according to the image proportion of each target object and an overlap of the image of each target object in the initial fluoroscopy image; An imaging module is configured to determine a target ray parameter matched with the interventional operation state, and update the current ray parameter through the target ray parameter, so that the medical imaging device images the target region based on the target ray parameter.

9. A computer readable storage medium having stored thereon computer instructions, wherein, The instructions are executed by the processor to implement the steps of the method of any one of claims 1-7.

10. An image forming apparatus characterized by comprising: The processor is configured to execute the steps of the method of any one of claims 1-7.

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