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A log-linear analytics approach to cost model regularization for inpatient stays through diagnostic code merging 通过诊断代码合并的住院病人成本模型正则化的对数线性分析方法
Pub Date : 2025-11-06 DOI: 10.1016/j.health.2025.100431
Chi-Ken Lu, David Alonge, Nicole Richardson, Bruno Richard
Healthcare cost models that use a great number of detailed ICD-10 diagnostic codes produce unstable results, yet the underlying causes of this instability have not been well understood. This study provides a mathematical framework linking the variability of model coefficients to the uneven, power-law distribution of diagnostic codes and the structure of the regression model. We propose a transparent approach that improves coefficient stability by merging similar codes through hierarchical truncation. Using Medicare data, we demonstrate how this method clarifies the trade-off between code detail and model reliability, offering analysts and policymakers a practical and interpretable tool for diagnosis-based cost modeling.
使用大量详细的ICD-10诊断代码的医疗保健成本模型产生不稳定的结果,但这种不稳定的潜在原因尚未得到很好的理解。本研究提供了一个数学框架,将模型系数的可变性与诊断代码的不均匀幂律分布和回归模型的结构联系起来。我们提出了一种透明的方法,通过分层截断合并相似的代码来提高系数稳定性。使用医疗保险数据,我们展示了这种方法如何澄清代码细节和模型可靠性之间的权衡,为分析师和决策者提供了一种实用且可解释的工具,用于基于诊断的成本建模。
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引用次数: 0
An interpretable machine learning model for dengue detection with clinical hematological data 基于临床血液学数据的登革热检测的可解释机器学习模型
Pub Date : 2025-11-03 DOI: 10.1016/j.health.2025.100430
Izaz Ahmmed Tuhin , A.K.M.Fazlul Kobir Siam , Md Mahfuzur Rahman Shanto , Md Rajib Mia , Imran Mahmud , Apurba Ghosh
Dengue fever remains a major global health concern that demands rapid and accurate diagnosis to prevent severe complications and support timely patient care. Traditional approaches relying on environmental variables often lack patient-level precision, limiting their clinical applicability. This study focuses on hematological parameters as more reliable indicators for early dengue detection. A novel machine learning framework, DengueStackX-19, was developed using 1,523 clinically verified patient records from Jamalpur 250-Bedded General Hospital, Jamalpur, Bangladesh. The dataset underwent rigorous preprocessing, normalization, and imbalance handling using various resampling techniques. Comparative evaluation across five balancing methods demonstrated that DengueStackX-19 consistently achieved the highest accuracy and robustness, performing effectively both before and after outlier removal. The model achieved 93.65 % accuracy and 89.63 % F1 during 10-fold cross-validation under SMOTEENN, and further attained 96.38 % accuracy and 94.20 % F1 in dengue classification, demonstrating robust generalization and consistent high performance across evaluation phases. Sensitivity analysis further verified its stability under feature perturbations. To ensure interpretability, SHAP and LIME were applied to identify the hematological factors most influential to the model's predictions, and the resulting patterns aligned with established clinical understanding. The model was deployed as an accessible web-based diagnostic tool, allowing healthcare professionals to perform real-time dengue detection without specialized laboratory infrastructure. This study demonstrates that hematology-driven AI models can significantly enhance diagnostic accuracy, reduce decision-making time, and improve patient outcomes, particularly in resource-limited settings.
登革热仍然是一个主要的全球卫生问题,需要迅速和准确的诊断,以防止严重并发症,并支持及时的病人护理。依赖环境变量的传统方法往往缺乏患者水平的精确性,限制了其临床适用性。本研究的重点是血液学参数作为早期登革热检测的更可靠指标。一种新的机器学习框架DengueStackX-19是利用来自孟加拉国Jamalpur 250床位综合医院的1,523例经临床验证的患者记录开发的。数据集经过严格的预处理、归一化和使用各种重采样技术的不平衡处理。五种平衡方法的对比评估表明,DengueStackX-19始终具有最高的准确性和鲁棒性,在异常值去除之前和之后都表现有效。在SMOTEENN下的10次交叉验证中,该模型的准确率为93.65%,F1为89.63%;在登革热分类中,该模型的准确率为96.38%,F1为94.20%,具有鲁棒的泛化性和跨评估阶段一致的高性能。灵敏度分析进一步验证了其在特征扰动下的稳定性。为了确保可解释性,应用SHAP和LIME来确定对模型预测影响最大的血液学因素,结果模式与已建立的临床理解一致。该模型作为一种可访问的基于网络的诊断工具部署,使卫生保健专业人员能够在没有专门实验室基础设施的情况下进行实时登革热检测。该研究表明,血液学驱动的人工智能模型可以显著提高诊断准确性,缩短决策时间,改善患者预后,特别是在资源有限的情况下。
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引用次数: 0
A bio-inspired approach to feature optimization for ischemic heart disease detection 缺血性心脏病检测特征优化的生物启发方法
Pub Date : 2025-10-30 DOI: 10.1016/j.health.2025.100427
D. Cenitta , N. Arul , T. Praveen Pai , R. Vijaya Arjunan , Tanuja Shailesh
Ischemic Heart Disease (IHD) stands as one of the primary contributors to worldwide deaths, therefore requiring precise and efficient predictive models. Standard machine learning techniques encounter hurdles, including excessive feature dimensions and unbalanced data distribution together with inappropriate feature group choice that negatively affect model effectiveness. The research introduces an optimized feature selection method by employing an Improved Squirrel Search Algorithm (ISSA) to raise the predictive capacity for IHD classification. The ISSA implements adaptive search features to automatically optimize feature selection, through which it maintains important attributes while eliminating redundant information. The selected features are evaluated using a Random Forest classifier, known for its robustness and interpretability in medical prediction tasks. Experimental results on the University of California Irvine (UCI) Heart Disease dataset show that the Improved Squirrel Search Algorithm–Random Forest (ISSA-RF) model achieves a classification accuracy of 98.12 %, outperforming existing feature selection techniques while reducing computational overhead. Bio-inspired optimization proves effective in medical diagnostics through recent research findings that lead to more efficient predictive healthcare models with interpretable properties.
缺血性心脏病(IHD)是全球死亡的主要原因之一,因此需要精确和有效的预测模型。标准的机器学习技术遇到了障碍,包括过多的特征维度和不平衡的数据分布,以及不适当的特征组选择,这些都会对模型的有效性产生负面影响。采用改进的松鼠搜索算法(ISSA)优化特征选择方法,提高IHD分类的预测能力。ISSA通过自适应搜索特征来自动优化特征选择,在保留重要属性的同时消除冗余信息。所选择的特征使用随机森林分类器进行评估,该分类器以其在医学预测任务中的鲁棒性和可解释性而闻名。在加州大学欧文分校(UCI)心脏病数据集上的实验结果表明,改进的松鼠搜索算法-随机森林(ISSA-RF)模型的分类准确率达到98.12%,优于现有的特征选择技术,同时减少了计算开销。通过最近的研究发现,以生物为灵感的优化在医学诊断中证明是有效的,这些发现导致了具有可解释属性的更有效的预测性医疗保健模型。
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引用次数: 0
An analytics framework for healthcare expenditure forecasting with machine learning 基于机器学习的医疗保健支出预测分析框架
Pub Date : 2025-10-28 DOI: 10.1016/j.health.2025.100428
John Wang , Shubin Xu , Yawei Wang , Houda EL Bouhissi
The United States healthcare system relies heavily on Medicaid, which serves nearly 80 million people and accounts for a substantial share of both state and federal budgets. This study employs a range of forecasting methods, including ARIMA, Holt's linear trend, polynomial regressions (degree 2 and 4), Prophet, and piecewise linear regression, as well as machine learning models such as random forest, gradient boosting, and support vector regression, to analyze the growth of Medicaid expenditures. Using data from 1966 to 2024, the analysis identifies historical patterns and evaluates model performance with Root Mean Squared Error (RMSE) and related metrics to project costs through 2035. The results show that the autoregressive model with integrated moving average and Prophet generate the most accurate baseline forecasts, suggesting that Medicaid expenditures are likely to exceed one trillion dollars within the next 15 years. Although the machine learning models produced somewhat lower estimates, they revealed complex relationships between policy variables and expenditure behavior, making them useful for building alternative forecasting scenarios. The discussion emphasizes the policy relevance of these findings, particularly in relation to budget sustainability and healthcare equity, and highlights the importance of employing multiple forecasting approaches. Overall, the study demonstrates the value of decision analytics in healthcare forecasting by highlighting the need for accurate predictions, flexible models, and interpretable outcomes. It provides evidence-based tools to anticipate Medicaid's financial challenges and support the development of sustainable healthcare strategies for the years ahead.
美国医疗保健系统严重依赖医疗补助计划,该计划为近8000万人提供服务,占州和联邦预算的很大一部分。本研究采用ARIMA、Holt线性趋势、多项式回归(2度和4度)、Prophet和分段线性回归等预测方法,以及随机森林、梯度增强和支持向量回归等机器学习模型,对医疗补助支出的增长进行了分析。使用1966年至2024年的数据,分析确定了历史模式,并使用均方根误差(RMSE)和2035年项目成本的相关指标评估了模型的性能。结果表明,综合移动平均线和Prophet的自回归模型产生了最准确的基线预测,表明医疗补助支出可能在未来15年内超过1万亿美元。尽管机器学习模型产生的估计值略低,但它们揭示了政策变量和支出行为之间的复杂关系,这使得它们对构建替代预测场景很有用。讨论强调了这些发现的政策相关性,特别是在预算可持续性和医疗公平方面,并强调了采用多种预测方法的重要性。总体而言,该研究通过强调对准确预测、灵活模型和可解释结果的需求,展示了决策分析在医疗保健预测中的价值。它提供了基于证据的工具来预测医疗补助计划的财务挑战,并支持未来几年可持续医疗保健战略的发展。
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引用次数: 0
An in-depth review and analysis of deep learning methods and applications in spinal cord imaging 深入回顾和分析深度学习方法及其在脊髓成像中的应用
Pub Date : 2025-10-28 DOI: 10.1016/j.health.2025.100429
Md Sabbir Hossain , Mostafijur Rahman , Mumtahina Ahmed , Ashifur Rahman , Md Mohsin Kabir , M.F. Mridha , Jungpil Shin
This systematic review explores the advances, technologies, and applications of deep learning in spinal cord magnetic resonance imaging (MRI). The current state of deep-learning techniques used for injury detection, disease diagnosis, and treatment planning in spinal cord imaging is thoroughly examined. This review includes a systematic analysis of over 100 studies from 2018 to 2025, selected based on clinical relevance, model performance, and innovation. Through a comprehensive analysis of recent literature, this review highlights the evolution and effectiveness of various deep-learning models in enhancing the accuracy and reliability of spinal cord MRI interpretations. Significant contributions of this review include identifying the most effective and innovative deep-learning approaches, such as Convolutional Neural Networks (CNNs) for precise lesion segmentation and Generative Adversarial Networks (GANs) for data augmentation. Additionally, it synthesizes current applications, such as improved injury detection and multiple sclerosis diagnosis, and explores deep-learning’s role in treatment planning. The review also addresses the challenges and limitations faced in this domain, including data scarcity, model interpretability, and computational demands, and proposes potential solutions and directions for future research. By offering these insights, this review provides a unique perspective on integrating deep-learning models into clinical workflows and their impact on clinical outcomes and patient care.
本系统综述探讨了脊髓磁共振成像(MRI)中深度学习的进展、技术和应用。深度学习技术用于损伤检测,疾病诊断和脊髓成像治疗计划的现状进行了彻底的检查。本综述包括对2018年至2025年的100多项研究的系统分析,这些研究是根据临床相关性、模型性能和创新来选择的。通过对近期文献的综合分析,本综述强调了各种深度学习模型在提高脊髓MRI解释的准确性和可靠性方面的发展和有效性。本综述的重要贡献包括确定最有效和创新的深度学习方法,例如用于精确病灶分割的卷积神经网络(cnn)和用于数据增强的生成对抗网络(gan)。此外,它还综合了当前的应用,如改进的损伤检测和多发性硬化症诊断,并探索了深度学习在治疗计划中的作用。本文还讨论了该领域面临的挑战和限制,包括数据稀缺性、模型可解释性和计算需求,并提出了未来研究的潜在解决方案和方向。通过提供这些见解,本综述为将深度学习模型集成到临床工作流程及其对临床结果和患者护理的影响提供了独特的视角。
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引用次数: 0
An analytical study of external factors influencing emergency occurrences in healthcare 影响医疗卫生突发事件发生的外部因素分析研究
Pub Date : 2025-10-19 DOI: 10.1016/j.health.2025.100426
Félicien Hêche , Philipp Schiller , Oussama Barakat , Thibaut Desmettre , Stephan Robert-Nicoud
This study investigates the impact of 19 external factors, related to weather, road traffic conditions, air quality, and time, on the hourly occurrence of emergencies. The analysis relies on six years of dispatch records (2015–2021) from the Centre Hospitalier Universitaire Vaudois (CHUV), which oversees 18 ambulance stations across the French-speaking region of Switzerland. First, classical statistical methods, including Chi-squared test, Student’s t-test, and information value, are employed to identify dependencies between the occurrence of emergencies and the considered parameters. Additionally, SHapley Additive exPlanations (SHAP) values and permutation importance are computed using eXtreme Gradient Boosting (XGBoost) and Multilayer Perceptron (MLP) models. Training and hyperparameter optimization were performed on data from 2015–2020, while the 2021 data were held out for evaluation and for computing model interpretation metrics. Results indicate that temporal features – particularly the hour of the day – are the dominant drivers of emergency occurrences, whereas other external factors contribute minimally once temporal effects are accounted for. Subsequently, performance comparisons with a simplified model that considers only the hour of the day suggest that more complex machine learning approaches offer limited added value in this context. Operationally, this result supports the use of simple time-dependent demand curves for EMS planning. Such models can effectively guide staffing schedules and relocations without the overhead of integrating external data or maintaining complex pipelines. By highlighting the limited utility of external predictors, this study provides practical guidance for EMS organizations seeking efficient, data-driven resource allocation methods.
本研究考察了天气、道路交通状况、空气质量和时间等19个外部因素对每小时突发事件发生的影响。该分析基于瑞士沃杜瓦大学医院中心(CHUV) 6年(2015-2021年)的调度记录,该中心负责监管瑞士法语区18个救护站。首先,采用经典的统计方法,包括卡方检验、学生t检验和信息值,来确定突发事件的发生与所考虑的参数之间的依赖关系。此外,SHapley加性解释(SHAP)值和排列重要性使用极端梯度增强(XGBoost)和多层感知器(MLP)模型计算。对2015-2020年的数据进行训练和超参数优化,同时保留2021年的数据进行评估和计算模型解释指标。结果表明,时间特征——特别是一天中的时间——是紧急情况发生的主要驱动因素,而一旦考虑到时间影响,其他外部因素的作用就微乎其微。随后,与只考虑一天中的一个小时的简化模型的性能比较表明,在这种情况下,更复杂的机器学习方法提供的附加价值有限。从操作上讲,该结果支持使用简单的随时间变化的需求曲线进行EMS规划。这样的模型可以有效地指导人员安排和重新部署,而不需要集成外部数据或维护复杂的管道。通过强调外部预测因素的有限效用,本研究为EMS组织寻求有效的、数据驱动的资源分配方法提供了实用的指导。
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引用次数: 0
A machine learning framework for identifying phenotypes in chronic kidney disease 用于识别慢性肾脏疾病表型的机器学习框架
Pub Date : 2025-10-17 DOI: 10.1016/j.health.2025.100425
Marzieh Amiri Shahbazi , Mohammad Abdullah Al-Mamun , Todd Brothers , Imtiaz Ahmed
Identifying meaningful patient phenotypes is a cornerstone of data-driven healthcare, enabling risk stratification, resource allocation, and the design of personalized care strategies. Achieving this requires robust analytical methods that can uncover hidden structure in high-dimensional clinical data while ensuring stability and interpretability of results. In this study, we present a machine learning framework for phenotypic clustering that combines partition-based (k-means) and probabilistic (latent class analysis, LCA) approaches. By comparing subgroup assignments across these complementary methods, the framework provides an internal validation of clustering assignments. Rather than relying on a single method, the framework validates subgroup assignments through cross-method agreement, strengthening confidence in the robustness of the identified phenotypes and their utility for decision support. We apply the proposed framework to patients with chronic kidney disease (CKD) stratified by prior history of acute kidney injury (AKI), illustrating its value in uncovering population-level heterogeneity. While the mechanisms linking AKI to CKD phenotypic patterns remain poorly understood historically, this study investigates CKD trajectories in patients with and without prior AKI and identifies key phenotypic patterns. The analysis revealed consistent phenotypic structures, with over 80% agreement between the two clustering approaches. Distinct phenotypic patterns emerged between the AKI and non-AKI cohorts, with cardiovascular conditions consistently dominating in both groups. These findings demonstrate how stratified clustering can uncover risk signatures that traditional CKD staging systems may overlook. By combining complementary clustering algorithms, the framework strengthens the analytic foundation of phenotyping studies. Moreover, it enables the design of phenotype specific care pathways such as cluster aware monitoring panels and tailored coordination strategies, thus underscoring the broader potential of data-driven analytics to advance personalized medicine and healthcare decision support.
识别有意义的患者表型是数据驱动医疗保健的基石,可以实现风险分层、资源分配和个性化护理策略的设计。实现这一目标需要强大的分析方法,可以揭示高维临床数据中的隐藏结构,同时确保结果的稳定性和可解释性。在本研究中,我们提出了一种用于表型聚类的机器学习框架,该框架结合了基于分区(k-means)和概率(潜类分析,LCA)方法。通过比较这些互补方法中的子组分配,该框架提供了聚类分配的内部验证。该框架不是依赖于单一方法,而是通过跨方法协议验证子组分配,增强了对已识别表型的稳健性及其决策支持效用的信心。我们将提出的框架应用于按急性肾损伤(AKI)病史分层的慢性肾脏疾病(CKD)患者,说明其在揭示人群水平异质性方面的价值。虽然AKI与CKD表型模式之间的联系机制在历史上仍然知之甚少,但本研究调查了有和没有AKI的患者的CKD轨迹,并确定了关键的表型模式。分析揭示了一致的表型结构,两种聚类方法之间的一致性超过80%。在AKI和非AKI组之间出现了不同的表型模式,心血管疾病在两组中始终占主导地位。这些发现证明了分层聚类如何揭示传统CKD分期系统可能忽略的风险特征。通过结合互补聚类算法,该框架加强了表型研究的分析基础。此外,它能够设计特定表型的护理途径,如集群感知监测面板和量身定制的协调策略,从而强调数据驱动分析在推进个性化医疗和医疗保健决策支持方面的更广泛潜力。
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引用次数: 0
An explainable analytics framework for predicting diabetes in women using Convolutional Neural Networks 使用卷积神经网络预测女性糖尿病的可解释分析框架
Pub Date : 2025-10-10 DOI: 10.1016/j.health.2025.100422
Gazi Mohammad Imdadul Alam , Tapu Biswas , Sharia Arfin Tanim , M.F. Mridha
Diabetes is a chronic metabolic disorder that heightens the risk of complications for women and presents diagnostic challenges owing to imbalanced datasets and the need for interpretable predictive models. In this study, we propose a 1D Convolutional Neural Network (1D CNN) model that achieves an accuracy of 98.61% on German Patient Dataset, comprising 2,000 samples, and 99.35% on the Bangladeshi Patient Dataset, which includes 465 samples. Our model effectively addresses class imbalance by integrating the Synthetic Minority Over-sampling Technique and Edited Nearest Neighbor (SMOTE-ENN), which significantly enhances performance. Additionally, we conducted a statistical comparison with Multi-Layer Perceptron (MLP), Long Short-Term Memory (LSTM), and Bidirectional LSTM (BiLSTM) models, demonstrating our CNN’s superior accuracy while maintaining reduced complexity and enhanced transparency through the integration of SHapley Additive exPlanations (SHAP). Our SHAP analysis revealed significant variations in feature importance between the two populations, offering culturally relevant insights into the risk factors for diabetes. The SHAP analysis not only facilitates interpretability by allowing healthcare professionals to understand the influence of individual features but also emphasizes the cultural context of diabetes risk. Overall, our findings surpass existing methodologies in terms of accuracy and complexity while underscoring the critical need for demographic diversity in predictive healthcare models, paving the way for more effective diabetes prediction strategies.
糖尿病是一种慢性代谢紊乱,增加了女性并发症的风险,由于数据集不平衡和需要可解释的预测模型,糖尿病给诊断带来了挑战。在这项研究中,我们提出了一个一维卷积神经网络(1D CNN)模型,该模型在德国患者数据集(包括2000个样本)上实现了98.61%的准确率,在孟加拉国患者数据集(包括465个样本)上实现了99.35%的准确率。我们的模型通过集成合成少数过采样技术和编辑最近邻(SMOTE-ENN)有效地解决了类不平衡问题,显著提高了性能。此外,我们与多层感知器(MLP)、长短期记忆(LSTM)和双向LSTM (BiLSTM)模型进行了统计比较,证明了我们的CNN在通过集成SHapley加性解释(SHAP)保持降低复杂性和增强透明度的同时具有卓越的准确性。我们的SHAP分析揭示了两种人群在特征重要性上的显著差异,为糖尿病的危险因素提供了与文化相关的见解。SHAP分析不仅有助于医疗保健专业人员理解个体特征的影响,而且还强调了糖尿病风险的文化背景。总的来说,我们的研究结果在准确性和复杂性方面超越了现有的方法,同时强调了预测医疗模型中人口多样性的关键需求,为更有效的糖尿病预测策略铺平了道路。
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引用次数: 0
A focal loss and sequential analytics approach for liver disease classification and detection 肝脏疾病分类和检测的局灶丢失和顺序分析方法
Pub Date : 2025-10-04 DOI: 10.1016/j.health.2025.100424
Musa Mustapha , Oluwadamilare Harazeem Abdulganiyu , Isah Ndakara Abubakar , Kaloma Usman Majikumna , Garba Suleiman , Mehdi Ech-chariy , Mekila Mbayam Olivier
Liver disease poses a significant global health challenge requiring accurate and timely diagnosis. This research develops a novel deep learning model, named AFLID-Liver, to improve the classification of liver diseases from medical data. The AFLID-Liver model integrates three key techniques: an Attention Mechanism to focus on the most relevant data features, Long Short-Term Memory (LSTM) networks to process potential sequential information, and Focal Loss to effectively handle imbalances between different disease classes in the dataset. This combination enhances the model's ability to learn complex patterns and make robust predictions. We evaluated AFLID-Liver using a dataset of various patient records, including biomarkers and demographics. Our proposed model achieved superior performance, with 99.9 % accuracy, 99.9 % precision, and a 99.9 % F-score, significantly outperforming a baseline Gated Recurrent Unit (GRU) model (99.7 % accuracy, 97.9 % F-score) and existing state-of-the-art approaches. These results demonstrate AFLID-Liver's potential for highly accurate liver disease detection. To validate the generalizability of the proposed model, we performed cross validation using an external dataset which also yielded a good performance depicting the potential of the proposed model. The novelty lies in the synergistic integration of these techniques, offering a robust approach for clinical decision support and improved patient outcomes. Future research will aim to enhance the computational efficiency, paving the way for its adoption in real-time clinical applications.
肝病是一项重大的全球健康挑战,需要准确和及时的诊断。本研究开发了一种新的深度学习模型,名为AFLID-Liver,以改进从医疗数据中对肝脏疾病的分类。AFLID-Liver模型集成了三种关键技术:专注于最相关数据特征的注意机制,处理潜在顺序信息的长短期记忆(LSTM)网络,以及有效处理数据集中不同疾病类别之间不平衡的焦点丢失。这种组合增强了模型学习复杂模式和做出可靠预测的能力。我们使用各种患者记录的数据集来评估AFLID-Liver,包括生物标志物和人口统计学。我们提出的模型取得了优异的性能,具有99.9%的准确度,99.9%的精度和99.9%的F-score,显著优于基线门控循环单元(GRU)模型(99.7%的准确度,97.9%的F-score)和现有的最先进的方法。这些结果证明了AFLID-Liver在高度精确的肝脏疾病检测方面的潜力。为了验证所提出模型的可泛化性,我们使用外部数据集进行交叉验证,该数据集也产生了良好的性能,描绘了所提出模型的潜力。新颖之处在于这些技术的协同整合,为临床决策支持和改善患者预后提供了强有力的方法。未来的研究将致力于提高计算效率,为其在实时临床应用中采用铺平道路。
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引用次数: 0
A constrained optimization approach for ultrasound shear wave speed estimation with time-lateral plane cleaning in medical imaging 医学成像中带时间横向平面清洗的超声剪切波速估计约束优化方法
Pub Date : 2025-09-27 DOI: 10.1016/j.health.2025.100423
MD Jahin Alam, Md. Kamrul Hasan
Ultrasound shear wave elastography (SWE) is a noninvasive tissue stiffness measurement technique for medical diagnosis. In SWE, an acoustic radiation force creates shear waves (SW) throughout a medium where the shear wave speed (SWS) is related to the medium stiffness. Traditional SWS estimation techniques are not noise-resilient in handling jitter and reflection artifacts. This paper proposes new techniques to estimate SWS in both time and frequency domains. These new methods utilize loss functions which are: (1) optimized by lateral signal shift between known locations, and (2) constrained by neighborhood displacement group shift determined from the time-lateral plane-denoised SW propagation. The proposed constrained optimization is formed by coupling neighboring particles’ losses with a Gaussian kernel, giving an optimum arrival time for the center particle to enforce local stiffness homogeneity and enable noise resilience. The explicit denoising scheme involves isolating SW profiles from time-lateral planes, creating parameterized masks. Additionally, lateral interpolation is performed to enhance reconstruction resolution and thereby improve the reliability of optimization. The proposed scheme is evaluated on a simulation (US-SWS-Digital-Phantoms) and three experimental phantom datasets: (i) Mayo Clinic CIRS049 model, (ii) RSNA-QIBA-US-SWS, (iii) Private data. The constrained optimization performance is compared with three time-of-flight (ToF) and two frequency-domain methods. The evaluations produced visually and quantitatively superior and noise-robust reconstructions compared to classical methods. Due to the quality and minimal error of SWS map formation, the proposed technique can find its application in tissue health inspection and cancer diagnosis.
超声剪切波弹性成像(SWE)是一种用于医学诊断的无创组织刚度测量技术。在SWE中,声辐射力在介质中产生横波(SW),其中横波速度(SWS)与介质刚度有关。传统的SWS估计技术在处理抖动和反射伪影时不具有抗噪声能力。本文提出了在时域和频域估计SWS的新技术。这些新方法利用的损失函数:(1)通过已知位置之间的横向信号位移来优化,(2)通过时间横向平面去噪的SW传播确定的邻域位移群位移来约束。所提出的约束优化是通过将相邻粒子的损失与高斯核耦合形成的,为中心粒子提供最佳到达时间,以增强局部刚度均匀性并使噪声恢复。显式去噪方案包括从时间横向平面中隔离SW剖面,创建参数化掩模。此外,通过横向插值提高重构分辨率,从而提高优化的可靠性。该方案在模拟(US-SWS-Digital-Phantoms)和三个实验幻影数据集上进行了评估:(i)梅奥诊所CIRS049模型,(ii) RSNA-QIBA-US-SWS, (iii)私人数据。对比了三种飞行时间法和两种频域法的约束优化性能。与经典方法相比,评估产生了视觉和数量上的优势和噪声鲁棒性重建。该方法具有质量好、误差小的特点,可用于组织健康检查和肿瘤诊断。
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Healthcare analytics (New York, N.Y.)
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