Feature reduction

特征约简
  • 文章类型: Journal Article
    种子储存不当可能会损害农业生产力,导致作物产量下降。因此,播种前评估种子活力至关重要。尽管存在许多评估种子条件的技术,这项研究利用高光谱成像(HSI)技术作为一项创新,快速,干净,和精确的无损检测方法。该研究旨在确定最有效的西瓜种子分类模型。最初,将购买的西瓜种子分为两组:一组在脱水机中在40°C下灭菌36小时,而另一批在有利的条件下储存。使用HSI和400至1000nm的电荷耦合器件相机捕获西瓜子的光谱图像,并测量所有样品的分割区域。应用预处理技术和波长选择方法来管理光谱数据工作量,其次是支持向量机(SVM)模型的实现。初始的混合SVM模型实现了100%的预测准确率,测试集精度为92.33%。随后,引入人工蜂群(ABC)优化模型以提高模型精度。结果表明,使用内核参数(c,g)分别设置为13.17和0.01,运行时间为4.19328s,数据集的训练和评估达到了100%的准确率。因此,利用HSI技术结合PCA-ABC-SVM模型检测不同的西瓜种子是实用的。因此,这些发现引入了一种准确预测种子活力的新技术,用于农业工业多光谱成像。实际应用:确定种子状况的传统方法主要强调美学,依靠主观评估,是耗时的,并且需要大量的劳动力。另一方面,采用HSI技术作为绿色技术来缓解上述问题。这项工作通过增强辨别各种类型的种子和农作物产品的能力,为工业多光谱成像领域做出了重大贡献。
    The improper storage of seeds can potentially compromise agricultural productivity, leading to reduced crop yields. Therefore, assessing seed viability before sowing is of paramount importance. Although numerous techniques exist for evaluating seed conditions, this research leveraged hyperspectral imaging (HSI) technology as an innovative, rapid, clean, and precise nondestructive testing method. The study aimed to determine the most effective classification model for watermelon seeds. Initially, purchased watermelon seeds were segregated into two groups: One underwent sterilization in a dehydrator machine at 40°C for 36 h, whereas the other batch was stored under favorable conditions. Watermelon seeds\' spectral images were captured using an HSI with a charge-coupled device camera ranging from 400 to 1000 nm, and the segmented regions of all samples were measured. Preprocessing techniques and wavelength selection methods were applied to manage spectral data workload, followed by the implementation of a support vector machine (SVM) model. The initial hybrid-SVM model achieved a predictive accuracy rate of 100%, with a test set accuracy of 92.33%. Subsequently, an artificial bee colony (ABC) optimization was introduced to enhance model precision. The results indicated that, with kernel parameters (c, g) set at 13.17 and 0.01, respectively, and a runtime of 4.19328 s, the training and evaluation of the dataset achieved an accuracy rate of 100%. Hence, it was practical to utilize HSI technology combined with the PCA-ABC-SVM model to detect different watermelon seeds. As a result, these findings introduce a novel technique for accurately forecasting seed viability, intended for use in agricultural industrial multispectral imaging. PRACTICAL APPLICATION: The traditional methods for determining the condition of seeds primarily emphasize aesthetics, rely on subjective assessment, are time-consuming, and require a lot of labor. On the other hand, HSI technology as green technology was employed to alleviate the aforementioned problems. This work significantly contributes to the field of industrial multispectral imaging by enhancing the capacity to discern various types of seeds and agricultural crop products.
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  • 文章类型: Journal Article
    背景:诊断与大脑认知和步态冻结阶段模式相关的疾病的重要性导致了最近对精神障碍步态研究的兴趣激增。一种更精确和有效的方法来表征和分类许多常见的步态问题,如脚和脑脉搏障碍,可以改善帕金森病患者的预后评估和治疗选择。尽管如此,目前评估步态异常的主要临床技术是视觉检查,这取决于观察者的主观性,可能是不准确的。
    目的:这项研究调查了是否可以使用机器学习驱动的监督学习技术和从大脑惯性测量单元传感器获得的数据来区分步态脑障碍和典型的步行模式。臀部和腿部康复。
    方法:所提出的方法利用了步态数据集的Daphnet冻结,由237个具有9个属性的实例组成。该方法在腿部和臀部步态识别中利用机器学习和特征减少方法。
    结果:从获得的结果来看,结论是,在所有分类器中,RF达到了最高的准确率,为98.9%,感知器达到了最低的准确率,即70.4%。在利用LDA作为特征缩减方法的同时,KNN,与SVM和LR分类器相比,RF和NB也实现了有希望的准确性和F1得分。
    结论:为了区分与脑组织冻结/非冻结和正常行走步态模式相关的不同步态障碍,这表明,不同的机器学习算法的集成提供了一个可行的和前瞻性的解决方案。这项研究意味着需要一种公正的方法来支持临床判断。
    BACKGROUND: The significance of diagnosing illnesses associated with brain cognitive and gait freezing phase patterns has led to a recent surge in interest in the study of gait for mental disorders. A more precise and effective way to characterize and classify many common gait problems, such as foot and brain pulse disorders, can improve prognosis evaluation and treatment options for Parkinson patients. Nonetheless, the primary clinical technique for assessing gait abnormalities at the moment is visual inspection, which depends on the subjectivity of the observer and can be inaccurate.
    OBJECTIVE: This study investigates whether it is possible to differentiate between gait brain disorder and the typical walking pattern using machine learning driven supervised learning techniques and data obtained from inertial measurement unit sensors for brain, hip and leg rehabilitation.
    METHODS: The proposed method makes use of the Daphnet freezing of Gait Data Set, consisted of 237 instances with 9 attributes. The method utilizes machine learning and feature reduction approaches in leg and hip gait recognition.
    RESULTS: From the obtained results, it is concluded that among all classifiers RF achieved highest accuracy as 98.9 % and Perceptron achieved lowest i.e. 70.4 % accuracy. While utilizing LDA as feature reduction approach, KNN, RF and NB also achieved promising accuracy and F1-score in comparison with SVM and LR classifiers.
    CONCLUSIONS: In order to distinguish between the different gait disorders associated with brain tissues freezing/non-freezing and normal walking gait patterns, it is shown that the integration of different machine learning algorithms offers a viable and prospective solution. This research implies the need for an impartial approach to support clinical judgment.
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  • 文章类型: Journal Article
    脑机接口(BCI)是获取大脑电活动并提供外部设备控制的系统。由于脑电图(EEG)是捕获大脑电活动的最简单的非侵入性方法,基于EEG的BCI是非常流行的设计。除了对四肢运动进行分类之外,最近的BCI研究集中在通过采用机器学习技术对同一只手上的手指运动进行分类的准确编码。最先进的研究有兴趣通过忽略大脑的空闲情况来编码五个手指运动(即,大脑不执行任何心理任务的状态)。这可能容易导致更多的误报,并大大降低分类性能,因此,BCI的表现。这项研究旨在提出一种更现实的系统,以从EEG信号中解码五个手指的运动和无心理任务(NoMT)情况。
    在这项研究中,利用了一种新颖的特征提取方法。使用通过固有时间尺度分解(ITD)计算的正确旋转分量(PRCs),最近已成功应用于不同的生物医学信号,提取用于分类的特征。随后,这些特征被应用于众所周知的分类器的输入及其不同的实现,以区分这六个类别。报告了在独立于受试者和依赖受试者的情况下获得的最高分类器性能。此外,检查了基于ANOVA的特征选择,以确定统计上显著的特征是否对分类器性能有影响.
    因此,集成学习分类器在测试分类器中达到了55.0%的最高准确率,和基于ANOVA的特征选择提高了分类器在基于EEG的BCI系统中对五指运动确定的性能。
    与类似研究相比,提出的实践在分类性能上实现了适度但显著的改进,尽管类的数量增加了一个(即,NoMT)。
    UNASSIGNED: Brain-computer interfaces (BCIs) are systems that acquire the brain\'s electrical activity and provide control of external devices. Since electroencephalography (EEG) is the simplest non-invasive method to capture the brain\'s electrical activity, EEG-based BCIs are very popular designs. Aside from classifying the extremity movements, recent BCI studies have focused on the accurate coding of the finger movements on the same hand through their classification by employing machine learning techniques. State-of-the-art studies were interested in coding five finger movements by neglecting the brain\'s idle case (i.e., the state that brain is not performing any mental tasks). This may easily cause more false positives and degrade the classification performances dramatically, thus, the performance of BCIs. This study aims to propose a more realistic system to decode the movements of five fingers and the no mental task (NoMT) case from EEG signals.
    UNASSIGNED: In this study, a novel praxis for feature extraction is utilized. Using Proper Rotational Components (PRCs) computed through Intrinsic Time Scale Decomposition (ITD), which has been successfully applied in different biomedical signals recently, features for classification are extracted. Subsequently, these features were applied to the inputs of well-known classifiers and their different implementations to discriminate between these six classes. The highest classifier performances obtained in both subject-independent and subject-dependent cases were reported. In addition, the ANOVA-based feature selection was examined to determine whether statistically significant features have an impact on the classifier performances or not.
    UNASSIGNED: As a result, the Ensemble Learning classifier achieved the highest accuracy of 55.0% among the tested classifiers, and ANOVA-based feature selection increases the performance of classifiers on five-finger movement determination in EEG-based BCI systems.
    UNASSIGNED: When compared with similar studies, proposed praxis achieved a modest yet significant improvement in classification performance although the number of classes was incremented by one (i.e., NoMT).
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  • 文章类型: Journal Article
    激酶融合基因是人类癌症融合基因中最活跃的融合基因群。帮助选择具有临床意义的激酶,以便具有融合基因的癌症患者可以更好地诊断,我们需要一个度量来推断泛癌融合基因中激酶的评估,而不是依赖于样本频率表达的融合基因。最重要的是,多项研究使用多种类型的基因组和临床信息评估人类激酶作为药物靶标,但是在他们的研究中没有人使用激酶融合基因。对无激酶融合基因事件的激酶的评估研究可能错过了增强激酶在癌症中的功能的机制之一的作用。为了填补这个空白,在这项研究中,我们提出了一种使用网络传播方法评估基因的新方法,以推断单个激酶影响由〜5K激酶融合基因对组成的激酶融合基因网络的可能性。为了选择更好的繁殖种子,我们通过降维来选择顶级基因,例如泛癌融合基因中单个基因的六个特征的主成分或潜在层信息。我们的方法可能提供一种新的方法来评估癌症中的人类激酶。
    Kinase fusion genes are the most active fusion gene group in human cancer fusion genes. To help choose the clinically significant kinase so that the cancer patients that have fusion genes can be better diagnosed, we need a metric to infer the assessment of kinases in pan-cancer fusion genes rather than relying on the sample frequency expressed fusion genes. Most of all, multiple studies assessed human kinases as the drug targets using multiple types of genomic and clinical information, but none used the kinase fusion genes in their study. The assessment studies of kinase without kinase fusion gene events can miss the effect of one of the mechanisms that enhance the kinase function in cancer. To fill this gap, in this study, we suggest a novel way of assessing genes using a network propagation approach to infer how likely individual kinases influence the kinase fusion gene network composed of ~5K kinase fusion gene pairs. To select a better seed of propagation, we chose the top genes via dimensionality reduction like a principal component or latent layer information of six features of individual genes in pan-cancer fusion genes. Our approach may provide a novel way to assess of human kinases in cancer.
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  • 文章类型: Journal Article
    虽然以前的研究表明,学生的心理变量与他们的高阶认知能力密切相关,像印度这样的第三世界国家基本上缺乏这样的研究,他们独特的社会经济文化挑战。我们的目的是调查心理变量(抑郁,焦虑和压力)和印度学生的认知功能,并根据这些变量预测认知表现。
    使用目的抽样系统地选择了四十三名大学生。广泛使用和验证的离线问卷用于评估他们的心理和认知状态。进行相关分析以检查这些变量之间的关联。应用人工神经网络(ANN)模型根据心理变量的得分来预测认知水平。
    相关分析显示情绪困扰和认知功能之间呈负相关。主成分分析(PCA)降低了输入数据的维数,用更少的特征有效地捕获方差。特征权重分析表明每个心理健康症状的均衡贡献,特别强调其中一个症状。人工神经网络模型表现出中等的预测性能,根据心理变量解释认知水平的一部分差异。
    该研究证实了大学生的情绪状态与认知能力之间的显着关联。具体来说,我们首次提供证据表明,在印度学生中,自我报告的压力水平较高,焦虑,抑郁症与认知测试中的较低表现有关。PCA和特征权重分析的应用为预测模型的结构提供了更深入的见解。值得注意的是,ANN模型的使用提供了作为情感属性的函数来预测这些认知领域的见解。我们的结果强调了解决心理健康问题和实施干预措施以增强大学生认知功能的重要性。
    UNASSIGNED: While previous studies have suggested close association of psychological variables of students withtheir higher-order cognitive abilities, such studies have largely been lacking for third world countries like India, with their unique socio-economic-cultural set of challenges. We aimed to investigate the relationship between psychological variables (depression, anxiety and stress) and cognitive functions among Indian students, and to predict cognitive performance as a function of these variables.
    UNASSIGNED: Four hundred and thirteen university students were systematically selected using purposive sampling. Widely used and validated offline questionnaires were used to assess their psychological and cognitive statuses. Correlational analyses were conducted to examine the associations between these variables. An Artificial Neural Network (ANN) model was applied to predict cognitive levels based on the scores of psychological variables.
    UNASSIGNED: Correlational analyses revealed negative correlations between emotional distress and cognitive functioning. Principal Component Analysis (PCA) reduced the dimensionality of the input data, effectively capturing the variance with fewer features. The feature weight analysis indicated a balanced contribution of each mental health symptom, with particular emphasis on one of the symptoms. The ANN model demonstrated moderate predictive performance, explaining a portion of the variance in cognitive levels based on the psychological variables.
    UNASSIGNED: The study confirms significant associations between emotional statuses of university students with their cognitive abilities. Specifically, we provide evidence for the first time that in Indian students, self-reported higher levels of stress, anxiety, and depression are linked to lower performance in cognitive tests. The application of PCA and feature weight analysis provided deeper insights into the structure of the predictive model. Notably, use of the ANN model provided insights into predicting these cognitive domains as a function of the emotional attributes. Our results emphasize the importance of addressing mental health concerns and implementing interventions for the enhancement of cognitive functions in university students.
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  • 文章类型: Journal Article
    在听力学领域,实现听觉障碍的准确辨别仍然是一个巨大的挑战。耳聋和耳鸣等情况对患者的整体生活质量产生重大影响,强调迫切需要精确有效的分类方法。这项研究引入了一种创新的方法,利用从三个不同队列获得的多视图脑网络数据:51名聋哑患者,54伴有耳鸣,和42个正常对照。精心收集脑电图(EEG)记录数据,聚焦于连接到具有10个感兴趣区域(ROI)的端到端密钥的70个电极。这些数据与机器学习算法协同集成。为了解决大脑连接数据固有的高维性质,主成分分析(PCA)用于特征约简,增强可解释性。所提出的方法使用集成学习技术进行评估,包括随机森林,额外的树木,梯度提升,和CatBoost。建议的模型的性能经过了一系列全面的指标审查,包括交叉验证准确性(CVA),精度,召回,F1分数,Kappa,和马修斯相关系数(MCC)。所提出的模型显示出统计意义,并有效地诊断听觉障碍,有助于早期发现和个性化治疗,从而提高患者的治疗效果和生活质量。值得注意的是,它们表现出可靠性和鲁棒性,具有高Kappa和MCC值。这项研究代表了听力学交叉的重大进展,神经影像学,和机器学习,对临床实践和护理具有变革性意义。
    In the field of audiology, achieving accurate discrimination of auditory impairments remains a formidable challenge. Conditions such as deafness and tinnitus exert a substantial impact on patients\' overall quality of life, emphasizing the urgent need for precise and efficient classification methods. This study introduces an innovative approach, utilizing Multi-View Brain Network data acquired from three distinct cohorts: 51 deaf patients, 54 with tinnitus, and 42 normal controls. Electroencephalogram (EEG) recording data were meticulously collected, focusing on 70 electrodes attached to an end-to-end key with 10 regions of interest (ROI). This data is synergistically integrated with machine learning algorithms. To tackle the inherently high-dimensional nature of brain connectivity data, principal component analysis (PCA) is employed for feature reduction, enhancing interpretability. The proposed approach undergoes evaluation using ensemble learning techniques, including Random Forest, Extra Trees, Gradient Boosting, and CatBoost. The performance of the proposed models is scrutinized across a comprehensive set of metrics, encompassing cross-validation accuracy (CVA), precision, recall, F1-score, Kappa, and Matthews correlation coefficient (MCC). The proposed models demonstrate statistical significance and effectively diagnose auditory disorders, contributing to early detection and personalized treatment, thereby enhancing patient outcomes and quality of life. Notably, they exhibit reliability and robustness, characterized by high Kappa and MCC values. This research represents a significant advancement in the intersection of audiology, neuroimaging, and machine learning, with transformative implications for clinical practice and care.
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  • 文章类型: Journal Article
    特征选择是机器学习和数据挖掘的关键组成部分,它解决了诸如不相关之类的挑战,噪音,大规模数据的冗余等。,这往往会导致维度的诅咒。本研究采用K最近邻包装器,使用六种自然启发算法实现特征选择,源自人类行为和哺乳动物启发的技术。在六个现实世界的数据集上评估,这项研究旨在比较这些算法在准确性方面的性能,特征计数,健身,收敛性和计算成本。这些发现强调了人类学习优化的有效性,跨多个性能指标的差而丰富的优化和灰狼优化器算法。例如,为了卑鄙的健身,人类学习优化优于其他人,其次是可怜和丰富的优化和和谐搜索。这项研究表明了人类启发算法的潜力,特别是差的和丰富的优化,在不影响分类精度的情况下进行鲁棒特征选择。
    Feature selection is a critical component of machine learning and data mining which addresses challenges like irrelevance, noise, redundancy in large-scale data etc., which often result in the curse of dimensionality. This study employs a K-nearest neighbour wrapper to implement feature selection using six nature-inspired algorithms, derived from human behaviour and mammal-inspired techniques. Evaluated on six real-world datasets, the study aims to compare the performance of these algorithms in terms of accuracy, feature count, fitness, convergence and computational cost. The findings underscore the efficacy of the Human Learning Optimization, Poor and Rich Optimization and Grey Wolf Optimizer algorithms across multiple performance metrics. For instance, for mean fitness, Human Learning Optimization outperforms the others, followed by Poor and Rich Optimization and Harmony Search. The study suggests the potential of human-inspired algorithms, particularly Poor and Rich Optimization, in robust feature selection without compromising classification accuracy.
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  • 文章类型: Journal Article
    乳腺癌是全球女性中第二常见的癌症,病理学家的诊断是一个耗时且主观的过程。计算机辅助诊断框架通过自动分类数据来减轻病理学家的工作量,其中深度卷积神经网络(CNN)是有效的解决方案。从预先训练的CNN的激活层提取的特征称为深度卷积激活特征(DeCAF)。在本文中,我们已经分析了所有的DeCAF特征在分类任务中不一定会导致更高的准确性,降维起着重要的作用。为此,我们提出了减少的DeCAF(R-DeCAF),并应用不同的降维方法,通过捕捉DeCAF特征的本质,实现特征的有效组合。这个框架使用预先训练的CNN,如AlexNet,VGG-16和VGG-19作为迁移学习模式下的特征提取器。DeCAF特征是从上述CNN的第一个全连接层中提取的,并采用支持向量机进行分类。在线性和非线性降维算法中,诸如主成分分析(PCA)的线性方法代表了深层特征之间的更好组合,并且在考虑特征的特定量的累积解释方差(CEV)的使用少量特征的分类任务中导致更高的准确度。使用实验BreakHis和ICIAR数据集验证了所提出的方法。综合结果表明,在特征向量大小(FVS)为23和CEV等于0.15的情况下,分类精度提高了4.3%。
    Breast cancer is the second most common cancer among women worldwide, and the diagnosis by pathologists is a time-consuming procedure and subjective. Computer-aided diagnosis frameworks are utilized to relieve pathologist workload by classifying the data automatically, in which deep convolutional neural networks (CNNs) are effective solutions. The features extracted from the activation layer of pre-trained CNNs are called deep convolutional activation features (DeCAF). In this paper, we have analyzed that all DeCAF features are not necessarily led to higher accuracy in the classification task and dimension reduction plays an important role. We have proposed reduced DeCAF (R-DeCAF) for this purpose, and different dimension reduction methods are applied to achieve an effective combination of features by capturing the essence of DeCAF features. This framework uses pre-trained CNNs such as AlexNet, VGG-16, and VGG-19 as feature extractors in transfer learning mode. The DeCAF features are extracted from the first fully connected layer of the mentioned CNNs, and a support vector machine is used for classification. Among linear and nonlinear dimensionality reduction algorithms, linear approaches such as principal component analysis (PCA) represent a better combination among deep features and lead to higher accuracy in the classification task using a small number of features considering a specific amount of cumulative explained variance (CEV) of features. The proposed method is validated using experimental BreakHis and ICIAR datasets. Comprehensive results show improvement in the classification accuracy up to 4.3% with a feature vector size (FVS) of 23 and CEV equal to 0.15.
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  • 文章类型: Journal Article
    自从我们使用磁共振成像(MRI)来检测脑部疾病以来已经有很长一段时间了,并且已经开发了许多有用的技术来完成这项任务。然而,为了确定结果,仍有可能进一步改进脑部疾病的分类。在我们提出的这项研究中,第一次,一种从MRI子图像中提取非线性特征的方法,该方法是从三维双树复小波变换(2DDT-CWT)的三个层次中获得的,以便对多种脑部疾病进行分类。从子图像中提取非线性特征后,我们使用谱回归判别分析(SRDA)算法来减少分类特征。而不是使用计算昂贵的深度神经网络,我们提出了混合RBF网络,该网络在其结构中同时使用k均值和递归最小二乘(RLS)算法进行分类。为了评估具有混合学习算法的RBF网络的性能,我们使用这些网络根据MRI处理对九种脑部疾病进行分类,并将结果与先前提出的分类器进行比较,包括,支持向量机(SVM)和K最近邻(KNN)。通过提取各种类型和数量的特征,与最近提出的案例进行综合比较。我们在本文中的目的是使用混合RBF分类器降低复杂性并改善分类结果,并且结果显示在两类和8和10类脑疾病的多重分类中均具有100%的分类精度。在本文中,我们提供了一种低计算和精确的脑MRI疾病分类方法。结果表明,该方法不仅准确,而且计算合理。
    It has been a long time since we use magnetic resonance imaging (MRI) to detect brain diseases and many useful techniques have been developed for this task. However, there is still a potential for further improvement of classification of brain diseases in order to be sure of the results. In this research we presented, for the first time, a non-linear feature extraction method from the MRI sub-images that are obtained from the three levels of the two-dimensional Dual tree complex wavelet transform (2D DT-CWT) in order to classify multiple brain disease. After extracting the non-linear features from the sub-images, we used the spectral regression discriminant analysis (SRDA) algorithm to reduce the classifying features. Instead of using the deep neural networks that are computationally expensive, we proposed the Hybrid RBF network that uses the k-means and recursive least squares (RLS) algorithm simultaneously in its structure for classification. To evaluate the performance of RBF networks with hybrid learning algorithms, we classify nine brain diseases based on MRI processing using these networks, and compare the results with the previously presented classifiers including, supporting vector machines (SVM) and K-nearest neighbour (KNN). Comprehensive comparisons are made with the recently proposed cases by extracting various types and numbers of features. Our aim in this paper is to reduce the complexity and improve the classifying results with the hybrid RBF classifier and the results showed 100 percent classification accuracy in both the two class and the multiple classification of brain diseases in 8 and 10 classes. In this paper, we provided a low computational and precise method for brain MRI disease classification. the results show that the proposed method is not only accurate but also computationally reasonable.
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  • 文章类型: Journal Article
    肝脏肿瘤的准确分割是肝癌早期诊断的前提。分割网络以相同的尺度连续提取特征,不能适应计算机断层扫描(CT)中肝脏肿瘤体积的变化。因此,本文提出了一种用于肝脏肿瘤分割的多尺度特征注意网络(MS-FANet)。在MS-FANet的编码器中引入了新颖的残余注意力(RA)块和多尺度下采样(MAD),以充分学习可变的肿瘤特征并同时提取不同尺度的肿瘤特征。在特征缩减过程中引入了双路特征(DF)滤波器和密集上采样(DU),以减少有效特征,实现肝肿瘤的精确分割。在公共LiTS数据集和3DIRCADb数据集上,MS-FANet达到平均骰子的74.2%和78.0%,分别,优于大多数最先进的网络,这有力地证明了优秀的肝肿瘤分割性能和学习不同尺度特征的能力。
    Accurate segmentation of liver tumors is a prerequisite for early diagnosis of liver cancer. Segmentation networks extract features continuously at the same scale, which cannot adapt to the variation of liver tumor volume in computed tomography (CT). Hence, a multi-scale feature attention network (MS-FANet) for liver tumor segmentation is proposed in this paper. The novel residual attention (RA) block and multi-scale atrous downsampling (MAD) are introduced in the encoder of MS-FANet to sufficiently learn variable tumor features and extract tumor features at different scales simultaneously. The dual-path feature (DF) filter and dense upsampling (DU) are introduced in the feature reduction process to reduce effective features for the accurate segmentation of liver tumors. On the public LiTS dataset and 3DIRCADb dataset, MS-FANet achieved 74.2% and 78.0% of average Dice, respectively, outperforming most state-of-the-art networks, this strongly proves the excellent liver tumor segmentation performance and the ability to learn features at different scales.
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