Biomedical Engineering Letters最新文献

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Continuous non-invasive estimates of cerebral blood flow using electrocardiography signals: a feasibility study. 使用心电图信号连续无创估计脑血流量:可行性研究。
IF 4.6 4区 医学
Biomedical Engineering Letters Pub Date : 2023-05-01 DOI: 10.1007/s13534-023-00265-z
Samuel J van Bohemen, Jeffrey M Rogers, Philip C Boughton, Jillian L Clarke, Joaquin T Valderrama, Andre Z Kyme
{"title":"Continuous non-invasive estimates of cerebral blood flow using electrocardiography signals: a feasibility study.","authors":"Samuel J van Bohemen,&nbsp;Jeffrey M Rogers,&nbsp;Philip C Boughton,&nbsp;Jillian L Clarke,&nbsp;Joaquin T Valderrama,&nbsp;Andre Z Kyme","doi":"10.1007/s13534-023-00265-z","DOIUrl":"https://doi.org/10.1007/s13534-023-00265-z","url":null,"abstract":"<p><p>This paper describes a potential method to detect changes in cerebral blood flow (CBF) using electrocardiography (ECG) signals, measured across scalp electrodes with reference to the same signal across the chest-a metric we term the Electrocardiography Brain Perfusion index (EBPi). We investigated the feasibility of EBPi to monitor CBF changes in response to specific tasks. Twenty healthy volunteers wore a head-mounted device to monitor EBPi and electroencephalography (EEG) during tasks known to alter CBF. Transcranial Doppler (TCD) ultrasound measurements provided ground-truth estimates of CBF. Statistical analyses were applied to EBPi, TCD right middle cerebral artery blood flow velocity (rMCAv) and EEG relative Alpha (rAlpha) data to detect significant task-induced changes and correlations. Breath-holding and aerobic exercise induced highly significant increases in EBPi and TCD rMCAv (<i>p</i> < 0.01). Verbal fluency also increased both measures, however the increase was only significant for EBPi (<i>p</i> < 0.05). Hyperventilation induced a highly significant decrease in TCD rMCAv (<i>p</i> < 0.01) but EBPi was unchanged. Combining all tasks, EBPi exhibited a highly significant, weak positive correlation with TCD rMCAv (r = 0.27, <i>p</i> < 0.01) and the Pearson coefficient between EBPi and rAlpha was r = - 0.09 (<i>p</i> = 0.05). EBPi appears to be responsive to dynamic changes in CBF and, can enable practical, continuous monitoring. CBF is a key parameter of brain health and function but is not easily measured in a practical, continuous, non-invasive fashion. EBPi may have important clinical implications in this context for stroke monitoring and management. Additional studies are required to support this claim.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at 10.1007/s13534-023-00265-z.</p>","PeriodicalId":46898,"journal":{"name":"Biomedical Engineering Letters","volume":"13 2","pages":"185-195"},"PeriodicalIF":4.6,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10130316/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9398574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Histologic evaluation of a catheter coated with paclitaxel PLGA nanoparticles in the internal jugular veins of rats. 大鼠颈内静脉中紫杉醇PLGA纳米颗粒涂层导管的组织学评价。
IF 4.6 4区 医学
Biomedical Engineering Letters Pub Date : 2023-04-29 eCollection Date: 2023-08-01 DOI: 10.1007/s13534-023-00282-y
Song-Yi Kim, Susmita Aryal, Wan Su Yun, Woo Cheol Kim, Suk-Bae Moon, Gi-Bong Chae, Jaehong Key, Seongyup Kim
{"title":"Histologic evaluation of a catheter coated with paclitaxel PLGA nanoparticles in the internal jugular veins of rats.","authors":"Song-Yi Kim, Susmita Aryal, Wan Su Yun, Woo Cheol Kim, Suk-Bae Moon, Gi-Bong Chae, Jaehong Key, Seongyup Kim","doi":"10.1007/s13534-023-00282-y","DOIUrl":"10.1007/s13534-023-00282-y","url":null,"abstract":"<p><p>The aim of this study is to investigate the potential impact of catheterization on intimal hyperplasia and explore the efficacy of Paclitaxel loaded PLGA nanoparticles (PTX-NPs) in preventing stenosis at the site of venous injury. Under general anesthesia, Central Venous Catheters were inserted into the rat's right internal jugular veins (IJV) using the cut-down technique. Twenty bare catheters (C) and twenty PTX-NPs coated catheters (P) were assigned to one of four groups (C2, C4, P2, or P4) based on catheter type and expected survival time. 2 or 4 weeks after surgery, IJVs were completely harvested by formalin fixation and gelatin infusion and slides were stained with H&E (Haematoxylin and Eosin) and Masson's technique. The P2 (Paclitaxel coating, 2 weeks) group showed the most proliferation among the four groups and the P4 (Paclitaxel coating, 4 weeks) showed a tendency to decrease proliferation. Additionally, the lumen size in the P4 group was about 6% smaller than in the P2 group, and there was a lower prevalence of stenotic grade in the P4 group. Our study suggests that PTX-NPs coated catheters may be effective in preventing venous stenosis if the intended usage is prolonged, rather than for a short-term period.</p><p><strong>Graphical abstract: </strong>Schematic representation of catheter functionalization and coating of PTX-NPs on Catheter.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at 10.1007/s13534-023-00282-y.</p>","PeriodicalId":46898,"journal":{"name":"Biomedical Engineering Letters","volume":"13 3","pages":"505-514"},"PeriodicalIF":4.6,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10382362/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9906233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Towards comprehensive evaluation of the FLEXotendon glove-III: a case series evaluation in pediatric clinical cases and able-bodied adults. FLEXotendon手套的综合评估III:儿科临床病例和健全成年人的病例系列评估。
IF 4.6 4区 医学
Biomedical Engineering Letters Pub Date : 2023-04-28 eCollection Date: 2023-08-01 DOI: 10.1007/s13534-023-00280-0
Phillip Tran, Drew Elliott, Kinsey Herrin, Jaydev P Desai
{"title":"Towards comprehensive evaluation of the FLEXotendon glove-III: a case series evaluation in pediatric clinical cases and able-bodied adults.","authors":"Phillip Tran, Drew Elliott, Kinsey Herrin, Jaydev P Desai","doi":"10.1007/s13534-023-00280-0","DOIUrl":"10.1007/s13534-023-00280-0","url":null,"abstract":"<p><p>Injuries involving the nervous system, such as a brachial plexus palsy or traumatic brain injury, can lead to impairment in the functionality of the hand. Assistive robotics have been proposed as a possible method to improve patient outcomes in rehabilitation. The work presented here evaluates the FLEXotendon Glove-III, a 5 degree-of-freedom, voice-controlled, tendon-driven soft robotic hand exoskeleton, with two human subjects with hand impairments and four able-bodied subjects. The FLEXotendon Glove-III was evaluated on four unimpaired subjects, in conjunction with EMG sensor data, to determine the quantitative performance of the glove in applied pinch force, perturbation resistance, and exertion reduction. The exoskeleton system was also evaluated on two subjects with hand impairments, using two standardized hand function tests, the Jebsen-Taylor Hand Function Test and the Toronto Rehabilitation Institute Hand Function Test. The subjects were also presented with three qualitative questionnaires, the Capabilities of Upper Extremities Questionnaire, the Quebec User Evaluation of Satisfaction with Assistive Technology, and the Orthotics Prosthetics User Survey-Satisfaction module. From the previous design, minor design changes were made to the exoskeleton. The quick connect system was redesigned for improved performance, the number of motors was reduced to decrease overall footprint, and the entire system was placed into a compact acrylic case that can be placed into a backpack for increased portability.</p>","PeriodicalId":46898,"journal":{"name":"Biomedical Engineering Letters","volume":"13 3","pages":"485-494"},"PeriodicalIF":4.6,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10382394/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9912011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Recent trends and challenges of surface electromyography in prosthetic applications. 表面肌电图在假肢应用中的最新趋势和挑战。
IF 4.6 4区 医学
Biomedical Engineering Letters Pub Date : 2023-04-22 eCollection Date: 2023-08-01 DOI: 10.1007/s13534-023-00281-z
Drishti Yadav, Karan Veer
{"title":"Recent trends and challenges of surface electromyography in prosthetic applications.","authors":"Drishti Yadav, Karan Veer","doi":"10.1007/s13534-023-00281-z","DOIUrl":"10.1007/s13534-023-00281-z","url":null,"abstract":"<p><p>Surface electromyography (sEMG) meets extensive applications in the field of prosthesis in the current period. The effectiveness of sEMG in prosthesis applications has been verified by numerous revolutionary developments and extensive research attempts. A large volume of research and literature works have explored and validated the vast use of these signals in prostheses as an assistive technology. The objective of this paper is to conduct a systematic review and offer a detailed overview of the work record in the prosthesis and myoelectric interfaces framework. This review utilized a systematic search strategy to identify published articles discussing the state-of-the-art applications of sEMG in prostheses (including upper limb prosthesis and lower limb prostheses). Relevant studies were identified using electronic databases such as PubMed, IEEE Explore, SCOPUS, ScienceDirect, Google Scholar and Web of Science. Out of 3791 studies retrieved from the databases, 188 articles were found to be potentially relevant (after screening of abstracts and application of inclusion-exclusion criteria) and included in this review. This review presents an investigative analysis of sEMG-based prosthetic applications to assist the readers in making further advancements in this field. It also discusses the fundamental advantages and disadvantages of using sEMG in prosthetic applications. It also includes some important guidelines to follow in order to improve the performance of sEMG-based prosthesis. The findings of this study support the widespread use of sEMG in prosthetics. It is concluded that sEMG-based prosthesis technology, still in its sprouting phase, requires significant explorations for further development. Supplementary investigations are necessary in the direction of making a seamless mechanism of biomechatronics for sEMG-based prosthesis by cohesive efforts of robotic researchers and biomedical engineers.</p>","PeriodicalId":46898,"journal":{"name":"Biomedical Engineering Letters","volume":"13 3","pages":"353-373"},"PeriodicalIF":4.6,"publicationDate":"2023-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10382439/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9912013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
All-optical optoacoustic micro-tomography in reflection mode. 反射模式下的全光学光声显微断层扫描。
IF 4.6 4区 医学
Biomedical Engineering Letters Pub Date : 2023-04-19 eCollection Date: 2023-08-01 DOI: 10.1007/s13534-023-00278-8
Tamar Harary, Yoav Hazan, Amir Rosenthal
{"title":"All-optical optoacoustic micro-tomography in reflection mode.","authors":"Tamar Harary, Yoav Hazan, Amir Rosenthal","doi":"10.1007/s13534-023-00278-8","DOIUrl":"10.1007/s13534-023-00278-8","url":null,"abstract":"<p><p>High-resolution optoacoustic imaging at depths beyond the optical diffusion limit is conventionally performed using a microscopy setup where a strongly focused ultrasound transducer samples the image object point-by-point. Although recent advancements in miniaturized ultrasound detectors enables one to achieve microscopic resolution with an unfocused detector in a tomographic configuration, such an approach requires illuminating the entire object, leading to an inefficient use of the optical power, and imposing a trans-illumination configuration that is limited to thin objects. We developed an optoacoustic micro-tomography system in an epi-illumination configuration, in which the illumination is scanned with the detector. The system is demonstrated in phantoms for imaging depths of up to 5 mm and in vivo for imaging the vasculature of a mouse ear. Although image-formation in optoacoustic tomography generally requires static illumination, our numerical simulations and experimental measurements show that this requirement is relaxed in practice due to light diffusion, which homogenizes the fluence in deep tissue layers.</p>","PeriodicalId":46898,"journal":{"name":"Biomedical Engineering Letters","volume":"13 3","pages":"475-483"},"PeriodicalIF":4.6,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10382435/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9906232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cortical representation of musical pitch in event-related potentials. 事件相关电位中音高的皮层表征。
IF 4.6 4区 医学
Biomedical Engineering Letters Pub Date : 2023-04-13 eCollection Date: 2023-08-01 DOI: 10.1007/s13534-023-00274-y
Taehyoung Kim, Miyoung Chung, Eunju Jeong, Yang Seok Cho, Oh-Sang Kwon, Sung-Phil Kim
{"title":"Cortical representation of musical pitch in event-related potentials.","authors":"Taehyoung Kim,&nbsp;Miyoung Chung,&nbsp;Eunju Jeong,&nbsp;Yang Seok Cho,&nbsp;Oh-Sang Kwon,&nbsp;Sung-Phil Kim","doi":"10.1007/s13534-023-00274-y","DOIUrl":"10.1007/s13534-023-00274-y","url":null,"abstract":"<p><p>Neural coding of auditory stimulus frequency is well-documented; however, the cortical signals and perceptual correlates of pitch have not yet been comprehensively investigated. This study examined the temporal patterns of event-related potentials (ERP) in response to single tones of pitch chroma, with an assumption that these patterns would be more prominent in musically-trained individuals than in non-musically-trained individuals. Participants with and without musical training (N = 20) were presented with seven notes on the C major scale (C4, D4, E4, F4, G4, A4, and B4), and whole-brain activities were recorded. A linear regression analysis between the ERP amplitude and the seven notes showed that the ERP amplitude increased or decreased as the frequency of the pitch increased. Remarkably, these linear correlations were anti-symmetric between the hemispheres. Specifically, we found that ERP amplitudes of the left and right frontotemporal areas decreased and increased, respectively, as the pitch frequency increased. Although linear slopes were significant in both groups, the musically-trained group exhibited marginally steeper slope, and their ERP amplitudes were most discriminant for frequency of tone of pitch at earlier latency than in the non-musically-trained group (~ 460 ms vs ~ 630 ms after stimulus onset). Thus, the ERP amplitudes in frontotemporal areas varied according to the pitch frequency, with the musically-trained participants demonstrating a wider range of amplitudes and inter-hemispheric anti-symmetric patterns. Our findings may provide new insights on cortical processing of musical pitch, revealing anti-symmetric processing of musical pitch between hemispheres, which appears to be more pronounced in musically-trained people.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at 10.1007/s13534-023-00274-y.</p>","PeriodicalId":46898,"journal":{"name":"Biomedical Engineering Letters","volume":"13 3","pages":"441-454"},"PeriodicalIF":4.6,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10382469/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9909267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Soft, adhesive and conductive composite for electroencephalogram signal quality improvement. 用于改善脑电图信号质量的柔软、粘合和导电复合材料。
IF 4.6 4区 医学
Biomedical Engineering Letters Pub Date : 2023-04-13 eCollection Date: 2023-08-01 DOI: 10.1007/s13534-023-00279-7
Jeong E Jin, Seohyeon Kim, Hyeji Yu, Keyong Nam Lee, Young Rag Do, Seung Min Lee
{"title":"Soft, adhesive and conductive composite for electroencephalogram signal quality improvement.","authors":"Jeong E Jin, Seohyeon Kim, Hyeji Yu, Keyong Nam Lee, Young Rag Do, Seung Min Lee","doi":"10.1007/s13534-023-00279-7","DOIUrl":"10.1007/s13534-023-00279-7","url":null,"abstract":"<p><p>Since electroencephalogram (EEG) is a very small electrical signal from the brain, it is very vulnerable to external noise or motion artifact, making it difficult to measure. Therefore, despite the excellent convenience of dry electrodes, wet electrodes have been used. To solve this problem, self-adhesive and conductive composites using carbon nanotubes (CNTs) in adhesive polydimethylsiloxane (aPDMS), which can have the advantages of both dry and wet electrodes, have been developed by mixing them uniformly with methyl group-terminated PDMS. The CNT/aPDMS composite has a low Young's modulus, penetrates the skin well, has a high contact area, and excellent adhesion and conductivity, so the signal quality is enhanced. As a result of the EEG measurement test, although it was a dry electrode, results comparable to those of a wet electrode were obtained in terms of impedance and motion noise. It also shows excellent biocompatibility in a human fibroblast cell test and a week-long skin reaction test, so it can measure EEG with high signal quality for a long period of time.</p>","PeriodicalId":46898,"journal":{"name":"Biomedical Engineering Letters","volume":"13 3","pages":"495-504"},"PeriodicalIF":4.6,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10382389/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9906229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Non-contact oxygen saturation monitoring for wound healing process using dual-wavelength simultaneous acquisition imaging system. 双波长同步采集成像系统用于伤口愈合过程的非接触式血氧饱和度监测。
IF 4.6 4区 医学
Biomedical Engineering Letters Pub Date : 2023-04-12 DOI: 10.1007/s13534-023-00275-x
You-Rim Park, Yoo-Kyoung Shin, Joo Beom Eom
{"title":"Non-contact oxygen saturation monitoring for wound healing process using dual-wavelength simultaneous acquisition imaging system.","authors":"You-Rim Park,&nbsp;Yoo-Kyoung Shin,&nbsp;Joo Beom Eom","doi":"10.1007/s13534-023-00275-x","DOIUrl":"https://doi.org/10.1007/s13534-023-00275-x","url":null,"abstract":"<p><p>Here we report the fabrication of a noncontact pulse oximeter system based on a dual-wavelength imaging system and its oxygen saturation monitoring performance during wound healing. The dual-wavelength imaging system consists of 660 nm and 940 nm light-emitting diodes and a multi-spectral camera that simultaneously accepts visible and near-infrared images. Using the proposed system, images were acquired at 30 fps at both wavelengths, and photoplethysmography signals were extracted by specifying a specific region in the images. We removed the signals caused by small movements and smoothed them using the discrete wavelet transform and moving average filter. To confirm the feasibility of the proposed noncontact oxygen saturation system, a wound model was created using a hairless mouse and oxygen saturation was measured during wound healing. The measured values were compared and analyzed using a reflective animal pulse oximeter. Through a comparative analysis of these two devices, the error of the proposed system was evaluated and the possibility of its clinical application and wound healing monitoring through oxygen saturation measurement confirmed.</p>","PeriodicalId":46898,"journal":{"name":"Biomedical Engineering Letters","volume":" ","pages":"1-9"},"PeriodicalIF":4.6,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10092937/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9892907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Facial electromyogram-based facial gesture recognition for hands-free control of an AR/VR environment: optimal gesture set selection and validation of feasibility as an assistive technology. 基于面部肌电图的面部手势识别用于AR/VR环境的免提控制:最佳手势集选择和作为辅助技术的可行性验证。
IF 4.6 4区 医学
Biomedical Engineering Letters Pub Date : 2023-04-11 eCollection Date: 2023-08-01 DOI: 10.1007/s13534-023-00277-9
Chunghwan Kim, Chaeyoon Kim, HyunSub Kim, HwyKuen Kwak, WooJin Lee, Chang-Hwan Im
{"title":"Facial electromyogram-based facial gesture recognition for hands-free control of an AR/VR environment: optimal gesture set selection and validation of feasibility as an assistive technology.","authors":"Chunghwan Kim, Chaeyoon Kim, HyunSub Kim, HwyKuen Kwak, WooJin Lee, Chang-Hwan Im","doi":"10.1007/s13534-023-00277-9","DOIUrl":"10.1007/s13534-023-00277-9","url":null,"abstract":"<p><p>The rapid expansion of virtual reality (VR) and augmented reality (AR) into various applications has increased the demand for hands-free input interfaces when traditional control methods are inapplicable (e.g., for paralyzed individuals who cannot move their hands). Facial electromyogram (fEMG), bioelectric signals generated from facial muscles, could solve this problem. Discriminating facial gestures using fEMG is possible because fEMG signals vary with these gestures. Thus, these signals can be used to generate discrete hands-free control commands. This study implemented an fEMG-based facial gesture recognition system for generating discrete commands to control an AR or VR environment. The fEMG signals around the eyes were recorded, assuming that the fEMG electrodes were embedded into the VR head-mounted display (HMD). Sixteen discrete facial gestures were classified using linear discriminant analysis (LDA) with Riemannian geometry features. Because the fEMG electrodes were far from the facial muscles associated with the facial gestures, some similar facial gestures were indistinguishable from each other. Therefore, this study determined the best facial gesture combinations with the highest classification accuracy for 3-15 commands. An analysis of the fEMG data acquired from 15 participants showed that the optimal facial gesture combinations increased the accuracy by 4.7%p compared with randomly selected facial gesture combinations. Moreover, this study is the first to investigate the feasibility of implementing a subject-independent facial gesture recognition system that does not require individual user training sessions. Lastly, our online hands-free control system was successfully applied to a media player to demonstrate the applicability of the proposed system.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at 10.1007/s13534-023-00277-9.</p>","PeriodicalId":46898,"journal":{"name":"Biomedical Engineering Letters","volume":"13 3","pages":"465-473"},"PeriodicalIF":4.6,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10382369/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9900418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Biomechanical microenvironmental stimulating effect of pulsed electromagnetic field on the regeneration of crush injured rat sciatic nerve. 脉冲电磁场对挤压损伤大鼠坐骨神经再生的生物力学微环境刺激效应
IF 4.6 4区 医学
Biomedical Engineering Letters Pub Date : 2023-04-07 eCollection Date: 2023-05-01 DOI: 10.1007/s13534-023-00276-w
Sang-Yoon Lee, Bongju Kim, Sung-Ho Lee, Kyungwon Ju, Soung-Min Kim, Jong-Ho Lee, KangMi Pang
{"title":"Biomechanical microenvironmental stimulating effect of pulsed electromagnetic field on the regeneration of crush injured rat sciatic nerve.","authors":"Sang-Yoon Lee, Bongju Kim, Sung-Ho Lee, Kyungwon Ju, Soung-Min Kim, Jong-Ho Lee, KangMi Pang","doi":"10.1007/s13534-023-00276-w","DOIUrl":"10.1007/s13534-023-00276-w","url":null,"abstract":"<p><p>This study evaluated the biomechanical microenvironmental stimulating effect of pulsed electromagnetic field (PEMF) on the regeneration of crush-injured rat sciatic nerve, when combined with bone marrow mesenchymal stem cells (BMSCs) and recombinant human nerve growth factor (rhNGF-β), in the form of an adenoviral vector-mediated NGF. Sprague-Dawley rats were equally distributed into six groups; PBS, BMSC, NGF-Ad + BMSC, PEMF + PBS, PEMF + BMSC and PEMF + NGF-Ad + BMSC. The PBS group received PBS (volume: 10μL/rat), the BMSC group with BMSCs (1 × 10<sup>6</sup> cell/10 μL/rat) and NGF-Ad group with the rhNGF-β Ad infected BMSCs (1 × 10<sup>6</sup> cell/10 μL/rat) immediate after right sciatic nerve crush injury. The PEMF groups were exposed to PEMF of 1mT, 50 Hz, 1 h/day. The rats were observed for 3 weeks. PEMF alone did not showed the positive effect compared with negative control group. The groups transplanted with BMSCs showed higher axonal regeneration compared with the groups without transplantation of the cells whether BMSC was infected with NGF-Ad or not and whether the animals received PEMF. PEMF + NGF-Ad + BMSC group showed the significantly highest number of axons than the other groups. Functionally, all groups showed marked improvement at 3 weeks postoperatively although the difference was not statistically significant among the groups. PEMF showed the positive effect when combined with BMSC and NGF-ad in aspect of number of axons. Therefore, combining the microenvironment stimulation methods of PEMF and conventional methods such as transplantation of stem cells and growth factor could be considered for the regeneration methods in the nerve damage.</p>","PeriodicalId":46898,"journal":{"name":"Biomedical Engineering Letters","volume":"13 2","pages":"235-243"},"PeriodicalIF":4.6,"publicationDate":"2023-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10130313/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9398575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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