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Influence of Different Stages of Post-Traumatic Elbow Joint Capsule Healing on Pronation Movement 肘关节创伤后关节囊愈合的不同阶段对伸展运动的影响
IF 2 4区 医学 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2024-09-18 DOI: 10.1007/s40846-024-00899-z
Fang Wang, Xin-Jie Chang, Ming-Xin Li, Ming-Ze Zhou, Bo-Tian Tian, Jian-Guo Zhang, Yu-Bo Fan

Purpose

In this study, animal experiments and finite element simulation was used to study pronation-supination and the mechanical environment of the elbow at different stages of joint capsule healing after injury to reveal the mechanism of mechanical factors affecting the development of the elbow contracture.

Methods

The injured limbs were immobilized for 2 weeks, 4 weeks, 6 weeks and 8 weeks in animal experiments. The total ROM and joint stiffness of the limbs were tested at each time point to define the differences between different groups. The internal soft tissue stress during joint capsule healing was obtained by finite element simulation.

Results

In the animal experiments, compared with the no injury group, the total ROM of the injury group was decreased and the joint stiffness of the injury group was increased. The joint capsule thickness and shear modulus increased gradually in different stages of joint capsule healing. In the simulation, the internal soft tissue stress increased at different stages of joint capsule healing. The peak stress of the capsule was 8.32 MPa, 10.5 MPa, 11.4 MPa, 11.1 MPa and 12.2 MPa, respectively. The peak stress of humerus cartilage at different stages of joint capsule healing was greater than that of ulna cartilage and 1.2 times that of ulna cartilage.

Conclusion

This study revealed the evolution of stress distribution in the surrounding tissue in the process of joint capsule healing and provided a theoretical basis for the rehabilitation of the elbow contracture and the design of rehabilitation aids.

目的 通过动物实验和有限元模拟研究损伤后关节囊愈合不同阶段肘关节的代偿-上举和力学环境,揭示力学因素影响肘关节挛缩发展的机制。在每个时间点测试肢体的总ROM和关节僵硬度,以确定不同组间的差异。结果 在动物实验中,与未受伤组相比,受伤组的总活动度降低,关节僵硬度增加。在关节囊愈合的不同阶段,关节囊厚度和剪切模量逐渐增加。模拟结果显示,在关节囊愈合的不同阶段,内部软组织应力增加。关节囊的峰值应力分别为 8.32 兆帕、10.5 兆帕、11.4 兆帕、11.1 兆帕和 12.2 兆帕。在关节囊愈合的不同阶段,肱骨软骨的峰值应力均大于尺骨软骨,是尺骨软骨的1.2倍。 结论 该研究揭示了关节囊愈合过程中周围组织应力分布的演变,为肘关节挛缩的康复和康复辅助工具的设计提供了理论依据。
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引用次数: 0
Attribute and Malignancy Analysis of Lung Nodule on Chest CT with Cause-and-Effect Logic 利用因果逻辑分析胸部 CT 上肺结节的属性和恶性程度
IF 2 4区 医学 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2024-09-13 DOI: 10.1007/s40846-024-00895-3
Hui Liu, Qingshan She, Jingchao Lin, Qiang Chen, Feng Fang, Yingchun Zhang

Purpose

Lung cancer is the leading cause of cancer-related death. Early detection and treatment are crucial to improve survival rates. Radiologists determine whether the nodules are benign or malignant by observing their morphological attributes. However, this can be a challenging task for well-trained doctors.

Methods

We propose a more efficient automatic lung nodule analysis method, which establishes a clear cause-and-effect logic relationship between attribute features and malignancy features by incorporating multiple instance learning (MIL). The designed MIL classifier aggregates the learned instance weights and corresponding attribute features to form malignancy features. Compared to existing methods, it starts by mirroring the way radiologists observe nodules, then proceeds to extract the multi-scale morphological attribute characteristics of the nodules. The instance weight also serves as the attribute score of the attribute, providing a reference for consultation.

Results

Our method was validated using the LIDC-IDRI dataset and achieved an accuracy of 93.05% on benign-malignant classification task with the added capability of accurately scoring the attributes.

Conclusion

The proposed method based on attribute score regression and multi-instance learning establishes the causal relationship between attribute scores and malignancy. This method improves accuracy in nodule classification and addresses the issue of poor model interpretability.

目的肺癌是导致癌症相关死亡的主要原因。早期发现和治疗对提高生存率至关重要。放射科医生通过观察结节的形态特征来判断结节是良性还是恶性。我们提出了一种更有效的肺结节自动分析方法,通过结合多实例学习(MIL),在属性特征和恶性特征之间建立了明确的因果逻辑关系。所设计的 MIL 分类器将学习到的实例权重和相应的属性特征聚合在一起,形成恶性肿瘤特征。与现有方法相比,它首先反映放射科医生观察结节的方式,然后提取结节的多尺度形态属性特征。我们的方法使用 LIDC-IDRI 数据集进行了验证,在良恶性分类任务中的准确率达到了 93.05%,并增加了对属性进行准确评分的功能。结论所提出的基于属性评分回归和多实例学习的方法建立了属性评分和恶性程度之间的因果关系。这种方法提高了结节分类的准确性,并解决了模型可解释性差的问题。
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引用次数: 0
Biomechanical Performance of Different Implant Spacings and Placement Angles in Partial Fixed Denture Prosthesis Restorations: A Finite Element Analysis 局部固定义齿修复体中不同种植体间距和植入角度的生物力学性能:有限元分析
IF 2 4区 医学 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2024-09-13 DOI: 10.1007/s40846-024-00896-2
Jianguo Zhang, Hu Hou, Peng Chen, Liang Song, Fengling Hu, Youcheng Yu

Purpose

The purpose of this study was to investigate the effects of implant spacing and placement angle on peri-implant bone stress using the finite element method.

Methods

A model of the maxilla of an edentulous patient was obtained by computed tomography, and a splint prosthesis consisting of short or tilted implants was applied to the maxillary posterior region. Three spacings (15, 17, and 19 mm) were used for each restoration, and three placement angles (− 5, 0, and 5 degrees) were available at each spacing. Finite element analysis was used to evaluate the stress distributions and resonant frequencies of all the models by applying both vertical and oblique forces to the splint prostheses simultaneously.

Results

The patters of stress distribution were better in the short implant group (19 mm with a − 5 degree placement angle) and the tilted implant group (19 mm with a 5 degree placement angle). In the short implant group, the difference in cortical bone stress (i.e., the difference between the maximum and minimum principal stresses) decreased from 248 MPa (15 mm, 5 degrees) to 116 MPa (19 mm, − 5 degrees), and the corresponding maximum von Mises stress in the implants was reduced by 35%. The resonance frequency of the short implant group (5300–5500 Hz) was slightly lower than that of the tilted implant group (5400–5700 Hz).

Conclusion

Implant spacing and the placement angle significantly affect the peri-implant bone stress distribution, proper implant placement is essential to minimize this risk.

方法通过计算机断层扫描获得一名无牙颌患者的上颌骨模型,并在上颌骨后部应用由短种植体或倾斜种植体组成的夹板修复体。每个修复体有三个间距(15、17 和 19 毫米),每个间距有三个植入角度(- 5、0 和 5 度)。结果短种植体组(19 毫米,- 5 度种植角)和倾斜种植体组(19 毫米,5 度种植角)的应力分布模式更好。在短种植体组中,皮质骨应力差(即最大和最小主应力之差)从 248 兆帕(15 毫米,5 度)降至 116 兆帕(19 毫米,- 5 度),种植体中相应的最大冯米塞斯应力降低了 35%。短种植体组的共振频率(5300-5500 Hz)略低于倾斜种植体组(5400-5700 Hz)。
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引用次数: 0
Enhancing Myocardial Infarction Diagnosis: LSTM-based Deep Learning Approach Integrating Echocardiographic Wall Motion Analysis 增强心肌梗死诊断:基于 LSTM 的深度学习方法与超声心动图室壁运动分析相结合
IF 2 4区 医学 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2024-09-12 DOI: 10.1007/s40846-024-00897-1
Hsu Thiri Soe, Hiroyasu Iwata

Purpose

Owing to the increased mortality of heart diseases worldwide, especially myocardial infarction (MI), early detection is essential for improved diagnosis and treatment. The main purpose of this study is to develop a myocardial infarction detection method that combines deep learning and image processing, focusing on abnormalities in left ventricular (LV) wall motion.

Methods

The proposed method primarily uses the LV wall motion movement as a feature to train an LSTM network for MI detection. LV wall motion annotated by expert cardiologists was used as the ground truth. Accuracy, sensitivity, specificity, and area under the curve (AUC) were used to evaluate model performance. The proposed method primarily uses LV wall motion as a feature, combined with LV size and image pixels, to improve diagnostic accuracy over existing computer-aided design (CAD) systems.

Results

The LSTM model achieved the highest diagnostic performance when trained on a combination of LV wall motion, LV size, and image pixel features with an accuracy of 95%, sensitivity of 96%, specificity of 94%, and an AUC value of 0.98. The LSTM model significantly outperformed models trained on individual feature sets or conventional machine learning algorithms. The inclusion of LV wall motion analysis improved accuracy by 10% compared to using only LV size and pixel data.

Conclusion

Our MI diagnosis system uses echocardiographic image analysis and LSTM-based deep learning to accurately detect LV wall motion issues related to MI. Compared with current CAD systems, the inclusion of LV wall motion analysis significantly improves diagnosis accuracy. The proposed system can help physicians detect MI early, thereby accelerating treatment and improving patient outcomes.

目的随着全球心脏病死亡率的上升,尤其是心肌梗塞(MI),早期检测对于改善诊断和治疗至关重要。本研究的主要目的是开发一种结合深度学习和图像处理的心肌梗塞检测方法,重点关注左心室壁运动异常。由心脏病专家标注的左心室壁运动作为基本事实。准确度、灵敏度、特异性和曲线下面积(AUC)用于评估模型性能。与现有的计算机辅助设计(CAD)系统相比,所提出的方法主要以左心室壁运动为特征,并结合左心室大小和图像像素,以提高诊断准确率。LSTM 模型的表现明显优于根据单个特征集或传统机器学习算法训练的模型。结论我们的 MI 诊断系统使用超声心动图图像分析和基于 LSTM 的深度学习来准确检测与 MI 相关的左心室壁运动问题。与当前的 CAD 系统相比,加入左心室壁运动分析可显著提高诊断准确性。该系统可以帮助医生及早发现心肌梗死,从而加快治疗速度并改善患者预后。
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引用次数: 0
Investigation of Image Quality for Cuboid and Tapered Array microPET Systems 立方体和锥形阵列 microPET 系统图像质量调查
IF 2 4区 医学 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2024-08-17 DOI: 10.1007/s40846-024-00890-8
Alireza Sadremomtaz, Payvand Taherparvar, Mohaddeseh Saber

Purpose

Small animals are integral to medical research as they provide insights into human diseases. Mice, particularly suitable as human models, share gene functions, making them vital for biomedical research. Positron emission tomography (PET) has emerged as a key tool for non-invasive imaging of mouse models, providing molecular-level insights with remarkable sensitivity. Achieving optimal spatial resolution is crucial for capturing detailed images of small animal organs, and enhancing sensitivity is imperative for microPET scanner efficiency.

Methods

This study investigates the performance of microPET scanners using cuboidal and tapered arrays, simulated by the GATE Monte Carlo package. To this end, it focuses on detector materials, crystal geometry, and reconstruction methods. Finally, critical parameters such as sensitivity, NECR, and FWHM of Gaussian fit of image intensity profiles are assessed.

Results

Simulation outputs reveal that tapered arrays outperform their cuboid counterparts by 44% in sensitivity and NECR, along with a 22% improvement in spatial resolution. The relative FWHM difference for crystals compared to LSO remains below 5%. Crystal material significantly affects sensitivity and NECR, with BGO demonstrating 25% greater values than LSO. Meanwhile, GSO and LYSO showed 32% and 60% lower values, respectively. BGO crystal demonstrated a higher profile amplitude, indicating higher counts. This difference could be attributed more to heightened noise than an increase in signal, as BGO crystals exhibit a higher scatter fraction than other crystals. Furthermore, COSEM and ACOSEM algorithms achieve the minimum FWHM of 0.7 mm, suggesting 10% better spatial resolution than the OSEM algorithm. In contrast, RAMLA and MRAMLA algorithms showed 14% and 4% worse spatial resolution than the OSEM algorithm, respectively.

Conclusion

Tapered arrays, especially when paired with BGO crystals, demonstrate superior sensitivity, NECR, and lower FWHM suggesting better spatial resolution than cuboid arrays. Crystal material choice minimally affects FWHM for a low-activity point source but significantly influences sensitivity and NECR, with BGO outperforming other crystals. COSEM and ACOSEM reconstruction algorithms yielded better image quality with lower FWHM and noise, demonstrating their effectiveness in microPET applications.

目的小动物是医学研究中不可或缺的一部分,因为它们能帮助人们深入了解人类疾病。小鼠尤其适合作为人类模型,它们共享基因功能,因此对生物医学研究至关重要。正电子发射断层扫描(PET)已成为对小鼠模型进行无创成像的关键工具,能以极高的灵敏度提供分子水平的见解。要捕捉小动物器官的详细图像,获得最佳空间分辨率至关重要,而提高灵敏度则是提高微型正电子发射计算机断层扫描仪效率的当务之急。为此,研究重点放在探测器材料、晶体几何形状和重建方法上。结果模拟结果显示,锥形阵列的灵敏度和 NECR 比立方体阵列高出 44%,空间分辨率也提高了 22%。晶体与 LSO 相比,相对 FWHM 差异仍低于 5%。晶体材料对灵敏度和 NECR 有很大影响,BGO 的数值比 LSO 高 25%。同时,GSO 和 LYSO 的数值分别低 32% 和 60%。BGO 晶体显示出更高的轮廓振幅,表明计数更高。这种差异更多的是由于噪声增大而非信号增加,因为 BGO 晶体的散射率高于其他晶体。此外,COSEM 和 ACOSEM 算法的最小 FWHM 为 0.7 毫米,表明其空间分辨率比 OSEM 算法高 10%。相比之下,RAMLA 和 MRAMLA 算法的空间分辨率分别比 OSEM 算法低 14% 和 4%。结论锥形阵列,尤其是与 BGO 晶体配对时,显示出卓越的灵敏度、NECR 和较低的 FWHM,表明其空间分辨率优于立方体阵列。晶体材料的选择对低活性点源的 FWHM 影响很小,但对灵敏度和 NECR 的影响很大,BGO 晶体的表现优于其他晶体。COSEM 和 ACOSEM 重建算法的图像质量更好,FWHM 和噪声更低,证明了它们在 microPET 应用中的有效性。
{"title":"Investigation of Image Quality for Cuboid and Tapered Array microPET Systems","authors":"Alireza Sadremomtaz, Payvand Taherparvar, Mohaddeseh Saber","doi":"10.1007/s40846-024-00890-8","DOIUrl":"https://doi.org/10.1007/s40846-024-00890-8","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Purpose</h3><p>Small animals are integral to medical research as they provide insights into human diseases. Mice, particularly suitable as human models, share gene functions, making them vital for biomedical research. Positron emission tomography (PET) has emerged as a key tool for non-invasive imaging of mouse models, providing molecular-level insights with remarkable sensitivity. Achieving optimal spatial resolution is crucial for capturing detailed images of small animal organs, and enhancing sensitivity is imperative for microPET scanner efficiency.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>This study investigates the performance of microPET scanners using cuboidal and tapered arrays, simulated by the GATE Monte Carlo package. To this end, it focuses on detector materials, crystal geometry, and reconstruction methods. Finally, critical parameters such as sensitivity, NECR, and FWHM of Gaussian fit of image intensity profiles are assessed.</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>Simulation outputs reveal that tapered arrays outperform their cuboid counterparts by 44% in sensitivity and NECR, along with a 22% improvement in spatial resolution. The relative FWHM difference for crystals compared to LSO remains below 5%. Crystal material significantly affects sensitivity and NECR, with BGO demonstrating 25% greater values than LSO. Meanwhile, GSO and LYSO showed 32% and 60% lower values, respectively. BGO crystal demonstrated a higher profile amplitude, indicating higher counts. This difference could be attributed more to heightened noise than an increase in signal, as BGO crystals exhibit a higher scatter fraction than other crystals. Furthermore, COSEM and ACOSEM algorithms achieve the minimum FWHM of 0.7 mm, suggesting 10% better spatial resolution than the OSEM algorithm. In contrast, RAMLA and MRAMLA algorithms showed 14% and 4% worse spatial resolution than the OSEM algorithm, respectively.</p><h3 data-test=\"abstract-sub-heading\">Conclusion</h3><p>Tapered arrays, especially when paired with BGO crystals, demonstrate superior sensitivity, NECR, and lower FWHM suggesting better spatial resolution than cuboid arrays. Crystal material choice minimally affects FWHM for a low-activity point source but significantly influences sensitivity and NECR, with BGO outperforming other crystals. COSEM and ACOSEM reconstruction algorithms yielded better image quality with lower FWHM and noise, demonstrating their effectiveness in microPET applications.</p>","PeriodicalId":50133,"journal":{"name":"Journal of Medical and Biological Engineering","volume":"108 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exosomes Derived from Irradiated-Prostate Cancer Cells Promote Cancer Progression 从经辐照的前列腺癌细胞中提取的外泌体促进癌症进展
IF 2 4区 医学 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2024-08-14 DOI: 10.1007/s40846-024-00888-2
Chien‑Chih Ke, Chikondi Jassi, Chih-Hung Chuang, Chiung-Yuan Ko, Shu-Pin Huang, Shih-Hsun Kuo, Chia-Yang Li, Ya‑Ju Hsieh

Purpose

Radiotherapy (RT) is a commonly employed therapeutic strategy for the treatment of localized cancers, including prostate cancer (PCa). Despite significant advancements in radiotherapy technology over recent years, high recurrence and metastasis of PCa after RT remain critical challenges. Various mechanisms have been implicated in how cancer evades radiotherapy, and exosomes, a type of extracellular vesicles (EVs) has recently been identified as one of the contributing factors. This study aimed to investigate whether exosomes derived from irradiated PCa cells are involved in the cancer progression and to identify possible key factor in this process.

Methods

Exosomes were isolated from irradiated or non-irradiated PCa cell lines (designated as Rad-Exo or Exo) and characterized by specific marker expression, morphology and size. PCa cells treated with Rad-Exo or Exo were analyzed for the effects of proliferation, specific gene expression, migration and cancer stem cell property. Differential protein expression in Rad-Exo and Exo were carried out by mass spectrometry.

Results

Results showed that, compared to Exo, Rad-Exo treatment inhibited cell proliferation but significantly promoted migration and elevated the expression of genes related to epithelial to mesenchymal transition. Additionally, cells treated with Rad-Exo showed increased expression of genes related to cancer stem cells. Mass spectrometry identified POTEE as more abundant within Rad-Exo then in Exo, and its expression was confirmed to be elevated in PCa cells following irradiation. Furthermore, POTEE expression increased in cells after Rad-Exo treatment.

Conclusion

This study suggests that exosomes derived from irradiated PCa cells may function as a driver of cancer progression, including recurrent or metastatic cancer. Also, exosomal POTEE may serve as a potential target for future therapeutic or diagnostic investigations in prostate cancer.

目的 放射治疗(RT)是治疗包括前列腺癌(PCa)在内的局部癌症的常用治疗策略。尽管近年来放疗技术取得了重大进展,但 PCa 在放疗后的高复发率和转移率仍然是严峻的挑战。癌症逃避放疗的机制有多种,而外泌体(一种细胞外囊泡(EVs))最近被认为是其中的一个因素。本研究旨在探讨从接受过辐照的PCa细胞中提取的外泌体是否参与了癌症的进展,并找出这一过程中可能存在的关键因素。方法从接受过辐照或未接受过辐照的PCa细胞系(命名为Rad-Exo或Exo)中分离出外泌体,并通过特定标记物的表达、形态和大小对其进行表征。分析了用 Rad-Exo 或 Exo 处理的 PCa 细胞对增殖、特定基因表达、迁移和癌症干细胞特性的影响。结果表明,与 Exo 相比,Rad-Exo 处理抑制了细胞增殖,但显著促进了迁移,并提高了上皮细胞向间充质转化相关基因的表达。此外,经 Rad-Exo 处理的细胞显示癌症干细胞相关基因的表达增加。质谱分析发现,POTEE在Rad-Exo中的含量比在Exo中更高,并证实其在PCa细胞中的表达在照射后升高。结论这项研究表明,从辐照过的 PCa 细胞中提取的外泌体可能是癌症(包括复发性或转移性癌症)进展的驱动因素。此外,外泌体 POTEE 可能成为未来前列腺癌治疗或诊断研究的潜在靶点。
{"title":"Exosomes Derived from Irradiated-Prostate Cancer Cells Promote Cancer Progression","authors":"Chien‑Chih Ke, Chikondi Jassi, Chih-Hung Chuang, Chiung-Yuan Ko, Shu-Pin Huang, Shih-Hsun Kuo, Chia-Yang Li, Ya‑Ju Hsieh","doi":"10.1007/s40846-024-00888-2","DOIUrl":"https://doi.org/10.1007/s40846-024-00888-2","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Purpose</h3><p>Radiotherapy (RT) is a commonly employed therapeutic strategy for the treatment of localized cancers, including prostate cancer (PCa). Despite significant advancements in radiotherapy technology over recent years, high recurrence and metastasis of PCa after RT remain critical challenges. Various mechanisms have been implicated in how cancer evades radiotherapy, and exosomes, a type of extracellular vesicles (EVs) has recently been identified as one of the contributing factors. This study aimed to investigate whether exosomes derived from irradiated PCa cells are involved in the cancer progression and to identify possible key factor in this process.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>Exosomes were isolated from irradiated or non-irradiated PCa cell lines (designated as Rad-Exo or Exo) and characterized by specific marker expression, morphology and size. PCa cells treated with Rad-Exo or Exo were analyzed for the effects of proliferation, specific gene expression, migration and cancer stem cell property. Differential protein expression in Rad-Exo and Exo were carried out by mass spectrometry.</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>Results showed that, compared to Exo, Rad-Exo treatment inhibited cell proliferation but significantly promoted migration and elevated the expression of genes related to epithelial to mesenchymal transition. Additionally, cells treated with Rad-Exo showed increased expression of genes related to cancer stem cells. Mass spectrometry identified POTEE as more abundant within Rad-Exo then in Exo, and its expression was confirmed to be elevated in PCa cells following irradiation. Furthermore, POTEE expression increased in cells after Rad-Exo treatment.</p><h3 data-test=\"abstract-sub-heading\">Conclusion</h3><p>This study suggests that exosomes derived from irradiated PCa cells may function as a driver of cancer progression, including recurrent or metastatic cancer. Also, exosomal POTEE may serve as a potential target for future therapeutic or diagnostic investigations in prostate cancer.</p>","PeriodicalId":50133,"journal":{"name":"Journal of Medical and Biological Engineering","volume":"32 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Subject-Specific Session-to-Session Transfer Learning Strategies for Increasing Brain-Computer Interface Performance during Upper Extremity Neurorehabilitation in Stroke 在脑卒中患者上肢神经康复过程中提高脑机接口性能的特定主题会话到会话迁移学习策略
IF 2 4区 医学 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2024-08-14 DOI: 10.1007/s40846-024-00891-7
Ruben I. Carino-Escobar, Luis A. Franceschi-Jimenez, Paul Carrillo-Mora, Jessica Cantillo-Negrete

Purpose

To assess if transfer learning strategies can improve stroke patients’ ability to control a Brain-computer interface (BCI) based on motor intention across an upper extremity neurorehabilitation intervention.

Methods

Three subject-specific session-to-session training strategies were retrospectively assessed in the present study, using information acquired during a BCI intervention in 12 stroke patients. One strategy used data from the previous therapy session (previous session), another used data from all previous sessions (accumulative) and another initially used previous session’s data and was updated with data acquired during the current session (instantaneous).

Results

Classification accuracy was significantly higher with the instantaneous strategy (median = 76.4%, IQR = [68.7%, 81.5%]) compared to the obtained with the accumulative (71.67%, [65.1%, 78.5%]) and previous session (69.2%, [59%, 77.4%]) strategies. Median classification accuracies across sessions were also higher with the instantaneous strategy in each BCI intervention session.

Conclusion

The instantaneous strategy could allow stroke patients to achieve a competitive level of BCI performance during a motor intention BCI intervention without reducing effective therapy time or requiring data from other patients.

目的评估迁移学习策略能否提高中风患者在上肢神经康复干预过程中根据运动意向控制脑机接口(BCI)的能力。方法在本研究中,利用在对 12 名中风患者进行 BCI 干预期间获得的信息,对三种针对特定对象的会话到会话训练策略进行了回顾性评估。结果与累积策略(71.67%,[65.1%,78.5%])和上一疗程策略(69.2%,[59%,77.4%])相比,瞬时策略的分类准确率明显更高(中位数 = 76.4%,IQR = [68.7%,81.5%])。结论瞬时策略可以让脑卒中患者在运动意向BCI干预期间达到具有竞争力的BCI性能水平,而不会减少有效治疗时间或需要其他患者的数据。
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引用次数: 0
Ultrasound Delta CBE Imaging: A New Approach Based on Local Energy Subtraction to Localization of the HIFU Focal Spot Using Changes in Backscattered Energy 超声三角CBE成像:基于局部能量减法的新方法,利用背向散射能量的变化定位 HIFU 病灶点
IF 2 4区 医学 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2024-08-07 DOI: 10.1007/s40846-024-00887-3
Kun Yang, Qiang Li, Xiaowei Zhou, Chiao-Yin Wang, Po-Hsiang Tsui

Purpose

High-intensity focused ultrasound (HIFU) is a promising non-invasive technique for thermal ablation of tumors. Positioning the focal point of the HIFU accurately prior to the procedure is crucial to the success of the treatment. A change in backscattered energy (CBE) in ultrasound images has been shown to allow visualization of thermal information and can be used to locate the focal spot of HIFU prior to ablation. In CBE imaging, however, tailing artifacts may exist below the focal point of HIFU to hinder the identification of the HIFU focal spot.

Methods

This study proposed ultrasound delta CBE (DCBE) imaging that reduces CBE artifacts by local energy subtraction between measured and the reference envelope images. Phantom experiments were performed for validation of the proposed method. A HIFU system operating at a frequency of 2.12 MHz was used to heat phantoms, which were imaged with a clinical ultrasound scanner equipped with a 3-MHz convex transducer for analysis of CBE and DCBE data.

Results

The results showed that the DCBE value increases monotonically with temperature (correlation coefficient = 0.90). Particularly, DCBE imaging can identify the HIFU focal spot, suppress tailing artifacts, and increase the contrast between the focal and artifact zones by 8 dB in comparison with conventional CBE imaging.

Conclusion

Based on this study, DCBE imaging may be an effective method of locating HIFU focal points through ultrasound backscattered energy.

目的高强度聚焦超声(HIFU)是一种很有前途的非侵入性肿瘤热消融技术。术前准确定位 HIFU 的焦点是治疗成功的关键。超声图像中背向散射能量(CBE)的变化已被证明可使热信息可视化,并可用于在消融前定位 HIFU 的焦点。本研究提出了超声δCBE(DCBE)成像方法,通过在测量图像和参考包膜图像之间进行局部能量减除来减少CBE伪影。为验证所提出的方法,进行了模拟实验。使用频率为 2.12 MHz 的 HIFU 系统加热模型,然后用配备 3 MHz 凸透镜的临床超声扫描仪对模型进行成像,分析 CBE 和 DCBE 数据。特别是,与传统的 CBE 成像相比,DCBE 成像可识别 HIFU 病灶点,抑制尾迹伪影,并将病灶区与伪影区的对比度提高 8 dB。
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引用次数: 0
Enhancing Two-Year Recurrence-Free Survival Prediction in Non-Small Cell Lung Cancer (NSCLC) Patients Using Tumor-Centric Attention Network (TCA-Net) 利用肿瘤中心注意网络(TCA-Net)加强非小细胞肺癌(NSCLC)患者两年无复发生存期预测
IF 2 4区 医学 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2024-08-07 DOI: 10.1007/s40846-024-00884-6
Hye Ryun Kim, Gahee Ahn, Helen Hong, Bong-Seog Kim

Purpose

Accurate predictions of postoperative recurrence are essential for determining appropriate follow-up treatments after surgery, as patients with non-small-cell lung cancer (NSCLC) at the same clinical stage have different recurrence incidences. However, simple convolutional neural network (CNN)-based methods are limited when presented with tumors of various sizes. This study aims to predict two-year recurrence-free survival precisely in patients with tumors of various sizes on preoperative CT images using what is termed a Tumor-Centric Attention Network (TCA-Net).

Methods

The proposed network features dual branches, each with an identical architecture but distinct weights to extract diverse features from CT images and tumor masks simultaneously. The tumor-centric attention module integrates two disparate feature maps at each level to amplify the characteristics of the tumor. All feature maps are concatenated with the finest resolution, enabling the extraction and integration of comprehensive multi-scale features for the complex tumor environment.

Results

TCA-Net showed an accuracy of 75%, balanced accuracy of 75.05%, specificity of 76.16% and an AUC value of 0.78. These results represent more balanced accuracies by 4.76% and 2.58% compared to ResNet-18 with CT images and dual ResNet-18s with CT images and tumor masks, respectively. Specifically, TCA-Net demonstrated a substantial improvement in the small-sized tumor group, achieving a balanced accuracy of 81.32%, sensitivity of 85.71%, and specificity of 76.92%.

Conclusion

TCA-Net improved the prediction performance of two-year recurrence-free survival on average across tumors of all sizes, with significant improvements, especially for small-sized tumors.

目的 由于处于同一临床阶段的非小细胞肺癌(NSCLC)患者的复发率不同,因此准确预测术后复发对于确定术后适当的后续治疗至关重要。然而,当遇到不同大小的肿瘤时,基于卷积神经网络(CNN)的简单方法就会受到限制。本研究旨在利用所谓的 "以肿瘤为中心的注意力网络"(TCA-Net),准确预测术前 CT 图像中不同大小肿瘤患者的两年无复发生存率。以肿瘤为中心的注意力模块在每个级别整合了两个不同的特征图,以放大肿瘤的特征。所有特征图均以最精细的分辨率进行串联,从而能够针对复杂的肿瘤环境提取和整合全面的多尺度特征。结果TCA-Net 的准确率为 75%,均衡准确率为 75.05%,特异性为 76.16%,AUC 值为 0.78。与使用 CT 图像的 ResNet-18 以及使用 CT 图像和肿瘤掩膜的双 ResNet-18 相比,这些结果表明均衡准确率分别提高了 4.76% 和 2.58%。结论TCA-Net 平均提高了各种大小肿瘤的两年无复发生存率预测性能,尤其是对小肿瘤的预测性能有显著提高。
{"title":"Enhancing Two-Year Recurrence-Free Survival Prediction in Non-Small Cell Lung Cancer (NSCLC) Patients Using Tumor-Centric Attention Network (TCA-Net)","authors":"Hye Ryun Kim, Gahee Ahn, Helen Hong, Bong-Seog Kim","doi":"10.1007/s40846-024-00884-6","DOIUrl":"https://doi.org/10.1007/s40846-024-00884-6","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Purpose</h3><p>Accurate predictions of postoperative recurrence are essential for determining appropriate follow-up treatments after surgery, as patients with non-small-cell lung cancer (NSCLC) at the same clinical stage have different recurrence incidences. However, simple convolutional neural network (CNN)-based methods are limited when presented with tumors of various sizes. This study aims to predict two-year recurrence-free survival precisely in patients with tumors of various sizes on preoperative CT images using what is termed a Tumor-Centric Attention Network (TCA-Net).</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>The proposed network features dual branches, each with an identical architecture but distinct weights to extract diverse features from CT images and tumor masks simultaneously. The tumor-centric attention module integrates two disparate feature maps at each level to amplify the characteristics of the tumor. All feature maps are concatenated with the finest resolution, enabling the extraction and integration of comprehensive multi-scale features for the complex tumor environment.</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>TCA-Net showed an accuracy of 75%, balanced accuracy of 75.05%, specificity of 76.16% and an AUC value of 0.78. These results represent more balanced accuracies by 4.76% and 2.58% compared to ResNet-18 with CT images and dual ResNet-18s with CT images and tumor masks, respectively. Specifically, TCA-Net demonstrated a substantial improvement in the small-sized tumor group, achieving a balanced accuracy of 81.32%, sensitivity of 85.71%, and specificity of 76.92%.</p><h3 data-test=\"abstract-sub-heading\">Conclusion</h3><p>TCA-Net improved the prediction performance of two-year recurrence-free survival on average across tumors of all sizes, with significant improvements, especially for small-sized tumors.</p>","PeriodicalId":50133,"journal":{"name":"Journal of Medical and Biological Engineering","volume":"163 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141935017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Artificial Intelligence as a Tool for Diagnosis of Cardiac Amyloidosis: A Systematic Review 人工智能作为诊断心脏淀粉样变性的工具:系统性综述
IF 2 4区 医学 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2024-08-06 DOI: 10.1007/s40846-024-00893-5
Armia Ahmadi-Hadad, Egle De Rosa, Luigi Di Serafino, Giovanni Esposito

Purpose

Cardiac amyloidosis (CA) is a highly underdiagnosed disease characterized by the accumulation of misfolded amyloid protein fragments in the heart, resulting in reduced heart functionality and myocardial stiffness. Artificial intelligence (AI) has garnered considerable interest as a potential tool for diagnosing cardiovascular diseases, including CA. This systematic review concentrates on the application of AI in the diagnosis of CA.

Methods

A comprehensive systematic search was performed on the databases of PubMed, Embase, and Medline, to identify relevant studies. The screening process was conducted in two stages, using predetermined inclusion and exclusion criteria, and was carried out in a blinded manner. In cases where discrepancies arose, the reviewers discussed and resolved the issue through consensus.

Results

Following the screening process, a total of 10 studies were deemed eligible for inclusion in this review. These investigations evaluated the potential utility of AI models that analyzed routine laboratory data, medical records, ECG, transthoracic echocardiography, CMR, and WBS in the diagnosis of CA.

Conclusion

AI models have demonstrated utility as a diagnostic tool for CA, with comparable or in one case superior efficacy to that of expert cardiologists.

目的心脏淀粉样变性(CA)是一种诊断率极低的疾病,其特征是折叠错误的淀粉样蛋白片段在心脏中堆积,导致心脏功能减退和心肌僵硬。人工智能(AI)作为诊断包括淀粉样变性在内的心血管疾病的潜在工具,已经引起了人们的极大兴趣。本系统性综述集中探讨了人工智能在诊断 CA 中的应用。筛选过程分为两个阶段,采用预先确定的纳入和排除标准,并以盲法进行。结果经过筛选,共有 10 项研究被认为符合纳入本综述的条件。这些研究评估了分析常规实验室数据、病历、心电图、经胸超声心动图、CMR 和 WBS 的人工智能模型在 CA 诊断中的潜在作用。
{"title":"Artificial Intelligence as a Tool for Diagnosis of Cardiac Amyloidosis: A Systematic Review","authors":"Armia Ahmadi-Hadad, Egle De Rosa, Luigi Di Serafino, Giovanni Esposito","doi":"10.1007/s40846-024-00893-5","DOIUrl":"https://doi.org/10.1007/s40846-024-00893-5","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Purpose</h3><p>Cardiac amyloidosis (CA) is a highly underdiagnosed disease characterized by the accumulation of misfolded amyloid protein fragments in the heart, resulting in reduced heart functionality and myocardial stiffness. Artificial intelligence (AI) has garnered considerable interest as a potential tool for diagnosing cardiovascular diseases, including CA. This systematic review concentrates on the application of AI in the diagnosis of CA.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>A comprehensive systematic search was performed on the databases of PubMed, Embase, and Medline, to identify relevant studies. The screening process was conducted in two stages, using predetermined inclusion and exclusion criteria, and was carried out in a blinded manner. In cases where discrepancies arose, the reviewers discussed and resolved the issue through consensus.</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>Following the screening process, a total of 10 studies were deemed eligible for inclusion in this review. These investigations evaluated the potential utility of AI models that analyzed routine laboratory data, medical records, ECG, transthoracic echocardiography, CMR, and WBS in the diagnosis of CA.</p><h3 data-test=\"abstract-sub-heading\">Conclusion</h3><p>AI models have demonstrated utility as a diagnostic tool for CA, with comparable or in one case superior efficacy to that of expert cardiologists.</p>","PeriodicalId":50133,"journal":{"name":"Journal of Medical and Biological Engineering","volume":"57 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141935016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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Journal of Medical and Biological Engineering
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