WO2020233254A1 - 一种融合结构化影像数据的医疗数据分析系统 - Google Patents
一种融合结构化影像数据的医疗数据分析系统 Download PDFInfo
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- G06N20/10—Machine learning using kernel methods, e.g. support vector machines [SVM]
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/11—Region-based segmentation
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H30/00—ICT specially adapted for the handling or processing of medical images
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- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H50/00—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
- G16H50/20—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for computer-aided diagnosis, e.g. based on medical expert systems
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- the invention belongs to the field of medical data analysis, and in particular relates to a medical data analysis system integrating structured image data.
- Biomedical data is widely involved in various fields related to human health. With the popularization of new biological/medical technology applications, the amount of medical electronic medical record data is growing rapidly, showing the characteristics of a wide variety, high-dimensional and multi-mode, complex and rich connotations, especially life High-dimensional unstructured medical data such as scientific omics data and medical imaging data require fast and specific analysis and processing capabilities.
- Existing technical solutions implement distributed storage and parallel summary calculations based on Hadoop open source software for big data platforms, improve access capabilities, and improve effective scheduling and processing efficiency of analysis tasks.
- Medical electronic medical record data includes demographic data, clinical diagnosis data, examination data, imaging data, etc., which have the characteristics of high dimensionality, complex and diverse types, and complex structures. Therefore, most of the existing processing methods are only for a single type of data (such as fundus retinal examination). Data, CT scan data of specific parts, etc.) for targeted disease scientific research may have shortcomings such as small data volume and slow analysis speed, and the data collection cycle is long, which is difficult to meet the requirements of accurate and rapid analysis.
- the purpose of the present invention is to provide a medical data analysis system integrating structured image data in view of the limitations of the existing biomedical data analysis mode.
- a medical data analysis system that integrates structured image data
- the system includes an image information structured module, a fusion and preprocessing module, and a machine learning algorithm module:
- Image information structuring module This module screens the corresponding medical image data from the hospital electronic medical record system according to the patient id, uses computer vision technology, and uses the U-Net convolutional neural network framework to achieve an end-to-end image segmentation model.
- the image is input as the model and the segmentation result map with the same size as the original image is obtained.
- the pixel value of the target segmentation area is 1, and the remaining pixel value is 0.
- the length and width of the original image are divided at equal distances to obtain a multiplicity of equal area.
- FIG determination result according to whether the target region segmentation, calculation of each area of the target region R i S i, center coordinates (x i, y i), a transverse longest distance W i and longitudinal longest distance H i, and obtains the azimuth of the number of the target region R i P i, the S i, (x i, y i), W i, H i, P i is a feature of the patient id associate to form an image Information structured data sheet.
- Fusion and preprocessing module This module filters out the structured data corresponding to these patient ids from the electronic medical record system according to the patient id existing in the image information structured data table, and splices the structured data to the image information in a manner corresponding to the id In the structured data table, the fusion of unstructured data and structured data of the same patient is realized; for each patient id in the structured data table of the image information after fusion, the missing rate of all features of the patient id is calculated. The patient id and its corresponding data whose missing rate exceeds the threshold are eliminated, and the missing features that do not exceed the threshold are completed.
- Machine learning algorithm module This module presets a number of machine learning algorithms, encapsulates the machine learning algorithm into a function form, and the user selects the machine learning algorithm and sets the algorithm parameters; this module receives the data table output by the fusion and preprocessing module, and The data table is converted into data in dataframe format, and the algorithm parameters set by the user are used as the input of the user selection function to complete the data analysis, and visually display the analysis results in the form of charts.
- the image information structuring module divides the original image into four sub-regions with the same area as the center of the original image, and assigns the orientation numbers 1, 2, 3, and 4, and maps the segmentation result map to the original image , the orientation of press center coordinates (x i, y i) where the target region R i subregion ID number as the orientation of the target area R i.
- each target area calculated by S i R i using the pixel coordinate information, (x i, y i) , W i, H i, is calculated as follows:
- N i is the number of pixels in the target region R i
- (x ij, y ij) is the coordinates of each R pixel i
- j is R the pixel number i
- H is the height and width of the original image
- N wi is the maximum number of horizontal pixels in the target region R i
- p is an image The scale of pixels to real length.
- a graphics analysis unit (GPU) is added to accelerate image analysis speed, and the combined use of Spark cluster and GPU is realized through the python high-performance computing library Numba.
- completing the missing features that do not exceed the threshold is specifically:
- x ⁇ [x min , x max ], x min , x max are the minimum and maximum values of the feature in the data table respectively;
- the OneHotEncoder function is used to map, and each element of the feature is converted into a numerical value that can be used for calculation, that is, OneHot type data. Make it suitable for general machine learning algorithms.
- machine learning algorithm in the machine learning algorithm module includes linear regression, logistic regression, support vector machine, random forest, etc.
- the system also includes a distributed data analysis platform: the platform is composed of three servers, and distributed access of data between a master server (Master) and two slave servers (Slave) is realized by deploying Hadoop and Spark clusters And task scheduling and parallel computing.
- Master master server
- Slave slave servers
- the beneficial effects of the present invention are: in the actual application process, the present invention has high calculation efficiency, large data utilization rate, simple operation, and is generally applicable to the research of medical data analysis subjects, and can reach a practical level. details as follows:
- the present invention aims at the integration of structured data such as disease examination and diagnosis, demographics, and unstructured data such as medical imaging data in the hospital electronic medical record system. Improve the utilization of biomedical data.
- Aiming at the difficulty of fusion analysis of medical image data and structured data in medical electronic medical records computer vision technology is used to structurally transform the key information of medical images, and other data with the same id in the electronic medical record system is integrated through data preprocessing.
- the module uses machine learning algorithms to comprehensively analyze data to form a high-efficiency and high-utilization medical data analysis system, which can meet the research needs of researchers in different topics.
- GPU graphics processing units
- Figure 1 Flow chart of medical data analysis system
- FIG. 1 Schematic diagram of image information structured module
- Figure 3 Schematic diagram of original image orientation encoding
- FIG. 4 Schematic diagram of fusion and preprocessing module
- FIG. 5 Schematic diagram of machine learning algorithm modules.
- a medical data analysis system integrating structured image data includes:
- the module screens the corresponding medical image data (unstructured data) from the hospital electronic medical record system according to the patient id, uses computer vision technology, and uses the U-Net convolutional neural network framework based on Olaf Ronneberger to achieve An end-to-end image segmentation model.
- a single image is input as the model and a segmentation result image with the same size as the original image is obtained.
- the pixel value of the target segmentation area is 1 and the remaining pixel values are 0.
- the original image is divided at equal distances The length and width of, get multiple sub-regions of equal area, and assign an orientation number to each sub-region; the following is an example of an orientation number:
- the original image is divided into four sub-regions with the same area as the center of the original image, and the orientation numbers 1, 2, 3, 4 are given, and the segmentation result map is mapped to the original image, according to the target area
- the azimuth number of the subregion where the center point coordinates (x i , y i ) of R i are located is used as the azimuth number of the target region R i .
- the segmentation results of FIG determines whether target region calculated for each region R i of the target area S i, center coordinates (x i, y i), the longest distance transverse and longitudinal longest distance W i H i, and acquires the target area
- the position number P i of R i associates S i , (x i , y i ), W i , H i , and P i as features with the patient id to form a structured data table of image information.
- N i is the number of pixels in the target region R i
- (x ij, y ij) is the coordinates of each pixel of the R i (j is R i number of pixels)
- H is the height and width of the original image
- N wi is the maximum number of horizontal pixels in the target region R i
- p is an image The ratio of mid-pixel to true length.
- the module is added to the graphics analysis unit (GPU) Speed up image analysis, and realize the joint use of Spark cluster and GPU through the python high-performance computing library Numba.
- GPU graphics analysis unit
- the module filters out the structured data corresponding to these patient ids from the electronic medical record system according to the patient ids in the image information structured data table (structured data can include multiple features, such as sub-type features , Numerical features), the structured data is spliced into the image information structured data table in the way of id correspondence to realize the fusion of unstructured data and structured data of the same patient; for the fused image information structured data For each patient id in the table, calculate the missing rate of all the features of the patient id, eliminate the patient id and its corresponding data whose missing rate exceeds the threshold (the threshold can be set to 60%), and supplement the missing features that do not exceed the threshold all.
- the threshold can be set to 60%
- x ⁇ [x min , x max ], x min , x max are the minimum and maximum values of the feature in the data table respectively;
- OneHotEncoder function mapping can be used to convert each element of the feature (that is, the data corresponding to the feature for each patient id) into a value that can be used for calculation, that is, OneHot data , Making it suitable for general machine learning algorithms.
- this module presets a number of machine learning algorithms, including linear regression, logistic regression, support vector machines, random forests, etc.; the machine learning algorithm is encapsulated into a function form, and the user chooses the machine learning algorithm and Set algorithm parameters; this module receives the data table output by the fusion and preprocessing module, converts the data table into dataframe format data, and uses the user set algorithm parameters as the input of the user selection function, and completes data analysis on the distributed data analysis platform , And visualize the analysis results in the form of charts.
- machine learning algorithms including linear regression, logistic regression, support vector machines, random forests, etc.
- the system can also include a distributed data analysis platform.
- the platform consists of three servers.
- Hadoop and Spark clusters distributed data access and tasks between one master server and two slave servers (Slave) are realized Scheduling and parallel computing.
- Image information structuring module The size of this type of chest CT image is 512*512. Each image has been trained on the U-Net convolutional neural network model, and the corresponding segmentation result image is output. According to the pixel count, S The number of 1 pixels N 1 is 1144, the number of S 2 pixels N 2 is 8876, and p is 21.4 mm.
- the structured text data corresponding to the same patient id is read in dataframe format, and the data content includes patientId (patient id), medication, gender, age, smoking, drinking, etc., according to patient id
- PatientId patient id
- Match the fusion image structured information data and structured text data calculate the data missing rate corresponding to each patient id, remove data with a missing rate of more than 60%, and perform median interpolation for missing data with a missing rate of less than 60%.
- Character data such as whether to use medicine is mapped to the OneHotEncoder function according to the rules of "Yes"-"[1,0]", "No"-"[0,1]” to form uniform numerical computable data.
- Machine learning algorithm module Aiming at the accuracy of predicting the cure of tuberculosis after one year of medication, select the logistic regression algorithm, set the maximum number of iterations to 1000 and other parameters, and read the preprocessed data in dataframe format. And pass the data, algorithm model, algorithm parameters, etc. into the analysis function through the interface call. After the calculation is completed, the analysis results are obtained, such as gender statistics pie chart, age distribution statistics histogram, prediction accuracy rate of 0.94, and visualization images The PR curve and POC curve have completed the system analysis process.
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Abstract
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Claims (8)
- 一种融合结构化影像数据的医疗数据分析系统,其特征在于,该系统包括:(1)影像信息结构化模块:该模块根据病人id从医院电子病历系统中筛选相对应的医疗影像数据,采用计算机视觉技术,利用U-Net卷积神经网络框架实现端到端的图像分割模型,以单张图像作为模型输入并得到与原图像大小相同的分割结果图,其中目标分割区域的像素点值为1,其余像素点值为0,以等距离划分原图像的长和宽,得到等面积的多个子区域,并对每个子区域赋予方位编号;根据分割结果图判断是否有目标区域,计算各个目标区域R i的面积S i、中心点坐标(x i,y i)、横向最长距离W i和纵向最长距离H i,并获取目标区域R i的方位编号P i,将S i、(x i,y i)、W i、H i、P i作为特征与病人id进行关联,形成影像信息结构化数据表。(2)融合与预处理模块:该模块根据影像信息结构化数据表中存在的病人id,从电子病历系统中筛选出这些病人id对应的结构化数据,以id对应的方式将结构化数据拼接到影像信息结构化数据表中,实现同一个病人的非结构化数据和结构化数据的融合;对于融合后的影像信息结构化数据表中的每个病人id,计算该病人id所有特征的缺失率,对缺失率超过阈值的病人id及其对应数据进行剔除,对未超过阈值的缺失特征进行补全。(3)机器学习算法模块:该模块预设若干机器学习算法,将机器学习算法封装成函数形式,由用户自行选择机器学习算法并设定算法参数;该模块接收融合与预处理模块输出的数据表,将数据表转换为dataframe格式数据,和用户设定算法参数共同作为用户选择函数的输入,完成数据分析,并以图表形式对分析结果进行可视化展示。
- 根据权利要求1所述一种融合结构化影像数据的医疗数据分析系统,其特征在于:所述影像信息结构化模块,以原图像中心点为中心,将原图像等面积分割成四个子区域,并给定方位编号1、2、3、4,分割结果图映射到原图像上,按目标区域R i的中心点坐标(x i,y i)所在子区域的方位编号作为该目标区域R i的方位编号。
- 根据权利要求1所述一种融合结构化影像数据的医疗数据分析系统,其特征在于:所述影像信息结构化模块中,加入图形分析单元(GPU)加速图像分析速度,并通过python高性能计算库Numba实现Spark集群和GPU的联合使用。
- 根据权利要求1所述一种融合结构化影像数据的医疗数据分析系统,其特征在于:所述融合与预处理模块中,对未超过阈值的缺失特征进行补全具体为:对于数值型特征,生成随机数x实现数据插值补全,x∈[x min,x max],x min,x max分别为该特征在数据表中的最小值和最大值;对于分类型特征,随机取该特征在数据表中出现的类别进行数据插值补全。
- 根据权利要求1所述一种融合结构化影像数据的医疗数据分析系统,其特征在于:所述融合与预处理模块中,对于分类型特征,在特征补全后,采用OneHotEncoder函数映射,将该特征的每个元素转化为一个可以用来计算的数值,即OneHot型数据,使之适用于通用机器学习算法。
- 根据权利要求1所述一种融合结构化影像数据的医疗数据分析系统,其特征在于:所述机器学习算法模块中的机器学习算法包括线性回归、逻辑回归、支持向量机、随机森林等。
- 根据权利要求1所述一种融合结构化影像数据的医疗数据分析系统,其特征在于:该系统还包括分布式数据分析平台:该平台由三台服务器构成,通过部署Hadoop和Spark集群实现一台主服务器(Master)和两台从服务器(Slave)间数据的分布式存取和任务调度及并行化计算。
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| CN116627680B (zh) * | 2023-07-20 | 2023-10-03 | 河北神玥软件科技股份有限公司 | 一种基于多源数据融合的云管理平台及方法 |
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