CN110120051A - A kind of right ventricle automatic division method based on deep learning - Google Patents
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Abstract
The present invention provides a kind of right ventricle automatic division method based on deep learning, which comprises the following steps: all cardiac magnetic resonance film short axis images of acquisition are pre-processed；Extract region of interest ROI；EDS extended data set；U-shaped network model is constructed in the library keras of deep learning, and is trained；Prediction of result is carried out using trained U-shaped network model.The present invention provides a kind of right ventricle full-automatic partition method based on deep learning, influence of the surrounding tissue to segmentation result is reduced by automatic identification ventricular area first, original U-shaped network is improved, to realize the accurate full-automatic dividing to right ventricle, provide the foundation for the further functional analysis and medical diagnosis on disease of heart.
Description
Technical field
The present invention relates to field of medical image processing, specially a kind of right ventricle based on deep learning side of segmentation automatically
Method.
Background technique
With being constantly progressive for Medical Image Processing, the segmentation of medical image segmentation, especially vitals is meter
The basis of calculation machine auxiliary diagnosis and treatment.Magnetic resonance imaging (Magnetic Resonance Imaging) is a kind of extensive use
In the standard technique of medical diagnosis.In cardiac magnetic resonance film image, the accurate segmentation of right ventricle can help people effective
Calculating ventricle end-systole and the parameters such as end-diastolic volume, stroke output and ejection fraction, to be carried out to heart
Further functional analysis and medical diagnosis on disease.
Left ventricular shape rule is surrounded by thicker cardiac muscle, and segmentation task is relatively easy, is studied also relatively deeply.Than
Left ventricle is played, right ventricle shape is in irregular semilune and myocardial wall is thin, adjoins with fat, makes accurate point of right ventricle
It is cut into for a difficult point.Common right ventricle dividing method has active contour model, level set, figure to cut, cluster and multichannel chromatogram
Segmentation etc., these methods show good effect on limited data set, but the often data except training data
It performs poor in library, needs manual intervention, cause sliced time to increase and the subjective impact being subject to is big.
Summary of the invention
The purpose of the present invention is: the segmentation precision of right ventricle is improved, the cost manually participated in is reduced.
In order to achieve the above object, the technical solution of the present invention is to provide a kind of right ventricle based on deep learning is automatic
Dividing method, which comprises the following steps:
Step 1, the pretreatment that all cardiac magnetic resonance film short axis images of acquisition are carried out with gray scale normalization, by pixel
Primary system one arrives [0,255] section；
Step 2 extracts region of interest ROI: seeking pretreated cardiac magnetic resonance film short axis images every two in step 1
The sum of the absolute difference image of a continuous phase, determines left ventricle center using hough-circle transform on error image,
The part for containing Ventricular is intercepted simultaneously as region of interest ROI image according to the positional relationship of Ventricular；
The data set of the image data of all region of interest ROI images obtained in step 3, expansion step 2, will own
Image data is adjusted to onesize and the data set after expansion is divided into training set, verifying collection and test set three parts；
Step 4 constructs U-shaped network model in the library keras of deep learning；
Step 5, the input by training set obtained in step 3 and verifying collection as U-shaped network model, to the U built
Type network model is trained and parameter adjustment, obtains trained U-shaped network model；
Step 6 predicts test set using U-shaped network model trained in step 5, carries out to the result of prediction
Post-processing, i.e., carry out binary conversion treatment to the probability graph that U-shaped neural network forecast obtains, and the binary map divided is tied by segmentation
Fruit calculates the different physical signs of right ventricle, and carries out analysis and assessment to result, wherein carrying out analysis and assessment to result includes essence
Exactness, correlation, consistency analysis, the evaluation index of accuracy be Dice coefficient (Dice Metric, DM) and Hao Siduofu away from
From (HausdorffDistance, HD), Dice coefficient is used to measure the similarity of automatic segmentation result and goldstandard, using public affairs
Formula:
In formula, DM (A, B) indicates that the Dice coefficient of A and B, A are the resulting size of automatic segmentation result, and B is expert
The size of the goldstandard marked manually；
Hausdorff distance is used to measure the asymmetric difference of maximum of two images, using formula:
HD (A, B)=max (maxa∈A(minb∈BD (a, b)), maxb∈B(mina∈AD (a, b)))
In formula, HD (A, B) indicates that the Hausdorff distance of A and B, A indicate that the profile divided automatically, B indicate that expert is manual
The profile of the goldstandard of mark, a are the point in profile A, and b is the point in profile B, d (a, b) be a point and b point Euclid away from
From.
Preferably, in step 3, region of interest ROI image obtained in step 2 is translated, rotated, overturn, is drawn
It stretches and achievees the purpose that EDS extended data set.
Preferably, in step 4, the U-shaped network model includes: the convolutional layer that convolution kernel is 3 × 3, batch normalized
Layer, the maximum pond layer that LeakyRelu activation primitive layer, core size are 2 × 2, extension convolutional layer, up-sampling layer, warp lamination
And softmax activation primitive layer.
Preferably, in step 6, the physical signs include end-diastolic volume (End Diastolic Volume,
EDV), end-systolic volume (End Systolic Volume, ESV), stroke output (StrokeVolume, SV), penetrate blood system
Number (EjectionFraction, EF).
Compared with prior art, the beneficial effects of the present invention are:
The present invention provides a kind of right ventricle full-automatic partition method based on deep learning passes through the automatic identification heart first
Chamber region reduces influence of the surrounding tissue to segmentation result, improves to original U-shaped network, to realize to right ventricle
Accurate full-automatic dividing provides the foundation for the further functional analysis and medical diagnosis on disease of heart.
Detailed description of the invention
Fig. 1 is the flow diagram of the method for the present invention；
Fig. 2 is the schematic network structure of the method for the present invention；
Fig. 3 is cardiac short axis image diastasis bottom segmentation result；
Fig. 4 is segmentation result in the middle part of cardiac short axis image diastasis；
Fig. 5 is segmentation result at the top of cardiac short axis image diastasis；
Fig. 6 is cardiac short axis image end-systole bottom segmentation result；
Fig. 7 is segmentation result in the middle part of cardiac short axis image end-systole；
Fig. 8 is to divide at the top of cardiac short axis image end-systole as a result, Fig. 3 into Fig. 8, is followed successively by interested from left to right
Region, segmentation result of the present invention and expert divide goldstandard.
Specific embodiment
With reference to the accompanying drawing, the present invention is further explained.It should be understood that these embodiments are merely to illustrate the present invention and do not have to
In limiting the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art can be with
The present invention is made various changes or modifications, such equivalent forms equally fall within model defined by the application the appended claims
It encloses.
A kind of right ventricle automatic division method based on deep learning disclosed in the present embodiment including the following steps:
(1) data prediction
The present invention carries out retrospective analysis (1.5T GE magnetic resonance imaging system) to heart film magnetic resonance image, this reality
Apply in example 844 width MRI image datas altogether including 61 patients, wherein male 22, women 39, the age covers 23~
93 years old, specific imaging parameters are as follows: image size 256 × 256, thickness 6-8mm, interlamellar spacing 2-4mm, every number of cases evidence include 6-10
Layer, every layer of 20-28 phase.Every number of cases is felt according to according to the absolute difference image of end-systole and the image of diastasis
The extraction in interest region, area-of-interest includes left and right ventricles, and area-of-interest is uniformly carried out gray scale normalization and is located in advance
Reason, makes image grayscale size value in [0,255] section, handles for follow-up data.41 number of cases are schemed according to 569 width MRI are amounted to
Parameters as being used to train and adjust network, wherein 80% image is as training set, 20% image is as verifying collection；
20 number of cases are split according to 275 width MRI images are amounted to as test set.For lack of training samples problem, the present invention is using flat
It moves, rotation, overturning, the method exptended sample amount stretched.
(2) network establishment and training
The network architecture of the present embodiment uses python language and keras deep learning library, uses
NVIDIAGeForceGTX 1050Ti is accelerated.
Improved U-shaped network model is built under the library keras of deep learning, will be adjusted to same 120 × 120 size
Training set and verifying collection input network are trained and adjust with parameter, and the output of network is that each pixel belongs to the general of right ventricle
Rate.
Network architecture includes: the convolutional layer that convolution kernel is 3 × 3, and batch normalized layer, LeakyRelu activate letter
Several layers, the maximum pond layer that core size is 2 × 2, extension convolutional layer, up-sampling layer, warp lamination and softmax activation primitive
Layer, network structure is as shown in Fig. 2, its parameter setting is as shown in table 1.Down-sampling is reduced on the basis of original U-shaped network
Number expands receptive field using convolution is extended, and batch normalized is added, changes activation primitive and loss function raising precision.
Table 1
The parameter of convolutional layer (Convolutional layer) is optimized by back-propagation algorithm.Convolution
The purpose of operation is to extract the different characteristic of input, first layer convolutional layer may can only extract some rudimentary feature such as edges,
Lines, the network of more layers can from low-level features the more complicated feature of iterative extraction.The output size of each layer of convolutional layer with
The relationship of input is indicated using following formula:
In formula, heightinput、heightoutput、heightkernelIt respectively inputs, the length of output and convolution kernel；
widthinput、widthoutput、widthkernelIt respectively inputs, the width of output and convolution kernel；Padding is 0 filling size,
Stride is step-length, and in the present embodiment, padding=1, stride=1 guarantee that each layer of output size is identical as input.
Normalized layer is criticized for handling the problem of data distribution of middle layer in training process changes.This implementation
Example passes through preprocessing process for the data normalization of input layer, but each layer of input data distribution of network is to become always
Change, the update of front layer training parameter will lead to the variation of back layer input data distribution, therefore will necessarily cause every below
The change of one layer of input data distribution, reducing data distribution difference bring using batch normalized influences.
Pond layer is used to reduce the output parameter of network, selects validity feature output, uses convolution kernel for 2 in the present embodiment
× 2 maximum pond layer takes the maximum value in four values for including in window as output, residual value is ignored.Activation primitive
Using LeakyRelu, a non-zero slope is assigned to all negative values on the basis of correcting linear unit R elu, in the present embodiment
Slope is set as 10.
Since data set picture size is smaller, therefore the down-sampling process of U-shaped network is reduced to 3 times, can effectively be extracted
Characteristics of image.According to can only there is the fact that a heart in piece image, influence of the surrounding tissue to feature extraction, benefit are reduced
Convolutional layer is replaced with extension convolutional layer, neural network can be reduced to similar features with the receptive field for increasing each layer of index times
Error extraction.Picture can be restored to size identical with input picture with deconvolution using up-sampling.
The loss function L (w) of the present embodiment uses Dice coefficient, is defined as:
In formula, ynIndicate n-th of sample training label, for right ventricle bianry image, i.e., 0 represents background, and 1 represents the right side
Ventricle；Indicate the prediction result of network, the process that training process, that is, undated parameter of network minimizes L (w).
(3) test data is split
The diastasis of each of test set patient and the image of end-systole are carried out using trained network
Prediction, the output result of neural network forecast are the probability that each pixel belongs to right ventricle, probability think greater than 0.5 be
Right ventricle carries out binary conversion treatment to probabilistic image by setting threshold value and obtains segmentation result to the end.Obtained by the present embodiment most
Whole segmentation result is shown in Fig. 5.
Claims (4)
1. a kind of right ventricle automatic division method based on deep learning, which comprises the following steps:
Step 1, the pretreatment that all cardiac magnetic resonance film short axis images of acquisition are carried out with gray scale normalization, by pixel primary system
One arrives [0,255] section；
Step 2 extracts region of interest ROI: pretreated cardiac magnetic resonance film short axis images every two in step 1 being asked to connect
The sum of the absolute difference image of continuous phase, determines left ventricle center using hough-circle transform on error image, according to
The positional relationship of Ventricular intercepts the part for containing Ventricular as region of interest ROI image simultaneously；
The data set of the image data of all region of interest ROI images obtained in step 3, expansion step 2, by all images
Data point reuse is onesize and the data set after expansion is divided into training set, verifying collection and test set three parts；
Step 4 constructs U-shaped network model in the library keras of deep learning；
Step 5, the input by training set obtained in step 3 and verifying collection as U-shaped network model, to the U-shaped net built
Network model is trained and parameter adjustment, obtains trained U-shaped network model；
Step 6 predicts test set using U-shaped network model trained in step 5, after carrying out to the result of prediction
Reason carries out binary conversion treatment to the probability graph that U-shaped neural network forecast obtains, the binary map divided passes through segmentation result meter
The different physical signs of right ventricle are calculated, and analysis and assessment are carried out to result, wherein it includes accurate for carrying out analysis and assessment to result
Degree, correlation, consistency analysis, the evaluation index of accuracy are Dice coefficient and Hausdorff distance, and Dice coefficient is for spending
The similarity for measuring automatic segmentation result and goldstandard, using formula:
In formula, DM (A, B) indicates that the Dice coefficient of A and B, A are the resulting size of automatic segmentation result, and B is that expert is manual
The size of the goldstandard of mark；
Hausdorff distance is used to measure the asymmetric difference of maximum of two images, using formula:
HD (A, B)=max (maxa∈A(minb∈BD (a, b)), maxb∈B(mina∈AD (a, b)))
In formula, HD (A, B) indicates that the Hausdorff distance of A and B, A indicate that the profile divided automatically, B indicate that expert marks manually
Goldstandard profile, a be profile A in point, b be profile B in point, d (a, b) be a point and b point Euclidean distance.
2. a kind of right ventricle automatic division method based on deep learning as described in claim 1, which is characterized in that step 3
In, region of interest ROI image obtained in step 2 is translated, is rotated, is overturn, stretches the mesh for reaching EDS extended data set
's.
3. a kind of right ventricle automatic division method based on deep learning as described in claim 1, which is characterized in that step 4
In, the U-shaped network model includes: the convolutional layer that convolution kernel is 3 × 3, batch normalized layer, LeakyRelu activation primitive
Layer, the maximum pond layer that core size is 2 × 2, extension convolutional layer, up-sampling layer, warp lamination and softmax activation primitive
Layer.
4. a kind of right ventricle automatic division method based on deep learning as described in claim 1, which is characterized in that step 6
In, the physical signs includes end-diastolic volume, end-systolic volume, stroke output, ejection fraction.
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| CN111784732B (en) * | 2020-06-28 | 2023-07-28 | 深圳大学 | Method and system for training heart motion field estimation model and heart motion field estimation |
| CN111784696B (en) * | 2020-06-28 | 2023-08-01 | 深圳大学 | Right ventricle segmentation model training method and system |
| WO2022161192A1 (en) * | 2021-02-01 | 2022-08-04 | 之江实验室 | Method for automatically segmenting left ventricle of spect three-dimensional reconstruction image |
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| WO2023193290A1 (en) * | 2022-04-08 | 2023-10-12 | 胡冠彤 | Medical imaging system and method for in-vitro heart simulator |
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Application publication date: 20190813 |