WO2021120934A1 - 一种基于卷积神经网络的DRGs自动分组方法 - Google Patents
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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
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Definitions
- the invention belongs to the field of computer medical technology, and in particular relates to a method for automatic grouping of DRGs based on a convolutional neural network.
- the post-payment system of medical insurance funds can easily stimulate excessive medical services, and the pre-payment system can easily cause defects such as shirking patients and reducing medical services, resulting in a continuous increase in total health costs and expenditures on medical insurance funds With a sharp rise, medical insurance funds in many regions are facing the risk of insufficient funds.
- DRGs Diagnosis Related Groups, disease diagnosis related groupings
- DRGs Diagnosis Related Groups, disease diagnosis related groupings
- case combination method which mainly group cases according to the principle of similar clinical process and similar cost and consumption. Pay according to different groups of diseases, and provide targeted treatment to avoid the waste of medical resources.
- the population structure, health status, and economic development level of different regions are different. It is necessary to establish a grouping system that adapts to local characteristics and adjust the grouping system according to the operating results.
- the proportion of cases in the hospital accounts for the proportion of all cases in the hospital, and the average cost of the DRGi group of cases represents the average cost of the i-th DRG group.
- the Chinese patent document with the publication number CN107463771A discloses a method and system for grouping cases, including: obtaining case information, dividing it into corresponding basic groups according to the main diagnostic codes and operation codes in the case information, and obtaining basic group codes and Basic group name; when the main diagnosis corresponding to the main diagnosis code does not belong to the length of stay-affected type, or the basic group does not belong to the specific basic group, the diagnosis complexity score corresponding to each diagnosis code is calculated according to the basic group code and each diagnosis code ;According to the diagnostic complexity score corresponding to each diagnostic code, the disease complexity index corresponding to the case information is calculated; according to the disease complexity index, the case information is divided into subdivision groups from the basic group to obtain the disease diagnosis-related group code and disease diagnosis-related grouping Name and relative weight of disease diagnosis related groups, complete case grouping.
- the present invention provides an automatic grouping method for DRGs based on a convolutional neural network, which can automatically classify disease types based on the actual information of the data.
- a method for automatic grouping of DRGs based on convolutional neural network including the following steps:
- step (3) Construct a convolutional neural network model and use the data obtained in step (2) for iterative training.
- use the k-means clustering method to cluster the feature vectors extracted by the convolutional neural network to obtain k category labels ,Combine category labels and classifier-supervised convolutional neural network for iterative training;
- the data to be divided is digitally encoded and then input into the trained model for grouping.
- the method of the present invention avoids the shortcomings of manual feature selection and newly added grouping categories for additional labeling of data, and automatic learning grouping can be performed for data that is fuzzy and difficult to group.
- step (2) when performing digital coding processing, the pathological data is digitized and uniformly converted into the range of 0 to 1.
- the conversion formula is as follows:
- V c is the current value to be calculated
- V min and V max are the minimum and maximum values in the serial number, respectively.
- step (3) a shallow convolutional neural network with a 3-layer convolutional layer is used to extract features from the data. .
- step (3) the training process of the convolutional neural network model is as follows:
- (3-1) use the convolutional neural network to extract the features of the encoded data.
- f(x,y) is the input data
- g(x,y) is the convolution kernel function
- m and n are the length and width of the convolution kernel respectively.
- the purpose of feature extraction is to synthesize different information of data and find the correlation between various information.
- step (3-2) Pass the feature vector extracted by the convolutional neural network in step (3-1) into the k-means clusterer for classification, and use the cosine distance to calculate the distance between the two types of vectors. Divide into a cluster, use the shortest distance between all members of a certain cluster and all the members of another cluster to measure the distance between clusters, and finally use the largest distance between clusters as the shortest distance. For better results, the corresponding k value is automatically selected according to the clustering effect.
- a and b are two different feature vectors.
- step (3-2) use the k categories obtained in step (3-2) as data labels, use the regression model and the loss measurement function to measure the learning effect of the network, and supervise the neural network learning until the network model converges.
- the regression model can be used for the softmax method of multi-classification problems.
- the calculation method is as follows:
- Z j is the output of the jth neuron
- N is the total number of categories
- P(z) j is the probability value of the jth category
- the model outputs a probability value for each category
- N categories are There are N probability values.
- y i is the label of the i-th category
- M is the number of samples.
- the present invention has the following beneficial effects:
- the method of the present invention combines the convolutional neural network with the k-means clustering method, uses the advantages of automatic feature extraction and automatic optimization of the convolutional neural network, extracts the connections between various features, and uses the labels generated by the clustering method Act in the classifier of the neural network, and then supervise the training and learning of the neural network, forming a method for automatically optimizing the grouping effect. For situations where it is difficult to group by using conventional grouping rules, this method can combine all the information of the actual data to group, and can add data to optimize the grouping effect without additional workload.
- Fig. 1 is a schematic flowchart of a method for automatic grouping of DRGs based on a convolutional neural network according to the present invention.
- a DRGs automatic grouping method based on convolutional neural network includes the following steps:
- S1 Collect case data and divide the cases into their corresponding groups according to the main diagnosis categories and core disease diagnosis-related grouping methods.
- the training data is performed in an optional group of the core disease diagnosis related group.
- S2 encode the data.
- the actual data is structured data described in text.
- the data needs to be coded into digital form and input into the convolutional network for learning, and the data is digitized and uniformly limited to the range of 0 to 1.
- V c is the current value to be calculated
- V min and V max are the minimum and maximum values in the serial number, respectively.
- the blood type column generally has 6 types: A, B, O, AB, unknown, and unchecked.
- the serial numbers can be assigned as 1, 2, 3, 4, 5, and 0 respectively.
- the serial number corresponding to A is 0, B
- the corresponding serial number is 1, and the converted values are 0.2 and 0.4 respectively.
- S3 construct a convolutional neural network to perform iterative training on the data obtained in S2, perform k-means clustering on the feature information output by the network to obtain k category labels, and then combine the network's classifier and category label to supervise neural network training.
- the network structure of the first three residual blocks of ResNet is selected, and the convolution uses 1 dimension.
- the network composed of convolution kernels extracts the features of the data.
- the convolution method can combine the information of various types of data and has good semantic information.
- the calculation formula is as follows:
- f(x,y) is the input data
- g(x,y) is the convolution kernel function
- m and n are the length and width of the convolution kernel respectively.
- the purpose of feature extraction is to synthesize different information of data and find the correlation between various information.
- S3-2 input the various feature information vectors output by S3-1 into the k-means clustering method, use the cosine similarity method to measure the distance between the various vectors, optimize the clustering algorithm, and divide the feature vector into k category.
- the initial value of k of k-means is determined according to the grouping rules of core disease diagnosis related groups. For example, according to the grouping rules, the preliminary grouping of diseases and related operations is divided into 9 groups. If this grouped data is trained, the initial value of k Tentatively set to 9. In the calculation of the clustering method, the value of k is adjusted according to the clustering effect.
- the principle of distance between feature vectors is used to determine whether they belong to the same cluster. If the distance between two feature vectors is small, they are the same cluster, otherwise they are different clusters. Use the shortest distance between all members of a certain type of cluster and all the members of another type to measure the distance between clusters. Finally, the maximum distance between clusters is the best effect, and the cosine distance is used in the calculation. To measure the distance between feature vectors, the calculation formula is as follows:
- a and b are two different feature vectors.
- step S3-3 using the k categories obtained in step S3-2 as data labels, and using a regression model and a loss measurement function to measure the learning effect of the network.
- the present invention selects the softmax method that can be used for multi-classification problems, and its calculation formula is as follows:
- Z j is the output of the jth neuron
- N is the total number of categories
- P(z) j is the probability value of the jth category.
- the model outputs a probability value for each category, and N categories have N probability values.
- y i is the label of the i-th category
- M is the number of samples.
- the data to be divided is encoded and input into the classification model, which automatically divides the corresponding groups.
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Abstract
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Claims (8)
- 一种基于卷积神经网络的DRGs自动分组方法,其特征在于,包括:(1)收集病例数据并将病例按照主要诊断大类和核心疾病诊断相关分组的方式进行划分,将病例数据划分至各自对应的组别中,作为训练数据集;(2)对训练数据集中的病例数据进行数字编码处理,将文字描述数据转换为对应的数字形式;(3)构建卷积神经网络模型并采用步骤(2)得到的数据进行迭代训练,训练过程中,使用k-means聚类方法对卷积神经网络提取的特征向量进行聚类得到k个类别标签,结合类别标签和分类器监督卷积神经网络进行迭代训练;(4)模型训练完毕后,将待划分的数据进行数字编码后输入到训练完毕的模型中进行分组。
- 根据权利要求1所述的基于卷积神经网络的DRGs自动分组方法,其特征在于,步骤(3)中,采用3层卷积层的浅层卷积神经网络对数据进行特征提取。
- 根据权利要求1所述的基于卷积神经网络的DRGs自动分组方法, 其特征在于,步骤(3)中,卷积神经网络模型的训练过程如下:(3-1),使用卷积神经网络对编码后的数据进行特征提取;(3-2),将步骤(3-1)卷积神经网络提取特征后的特征向量传入到k-means聚类器中进行分类,使用余弦距离计算两类向量之间的距离,距离较近的划分至一个类簇,用某一类簇所有成员到另一类所有成员之间的最短两点之间的距离度量类簇之间的距离,最终以类簇之间的距离最大为最佳效果,根据聚类效果自动选择对应的k值;(3-3),将步骤(3-2)得到的k个类别作为数据的标签,使用回归模型和损失度量函数对网络的学习效果进行度量,监督神经网络学习,直至网络模型收敛。
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