Biomedical Engineering / Biomedizinische Technik最新文献

Evaluation of the RF depositions at 3T in routine clinical scans with respect to the SAR safety to improve efficiency of MRI utilization 评估常规临床扫描中 3T 下射频沉积的 SAR 安全性，以提高磁共振成像的使用效率

IF 1.7 4区医学

Biomedical Engineering / Biomedizinische Technik Pub Date : 2024-09-18 DOI: 10.1515/bmt-2024-0339

Ruixin Li, Xinlian Chen, Yupeng Liao, Sherman Xuegang Xin

{"title":"Evaluation of the RF depositions at 3T in routine clinical scans with respect to the SAR safety to improve efficiency of MRI utilization","authors":"Ruixin Li, Xinlian Chen, Yupeng Liao, Sherman Xuegang Xin","doi":"10.1515/bmt-2024-0339","DOIUrl":"https://doi.org/10.1515/bmt-2024-0339","url":null,"abstract":"Objectives This study explores the potential for improving of 3T MRI utilization by assessing and tailoring RF exposure in routine clinical scans while complying to standard safety limit. Methods Using two generic human body models, we evaluated pbSAR10g values at four landmark positions (knee, pelvis, thoracic spine, head) at different wbSAR levels. Specifically, we analyzed local SAR10g in different operating modes and computed the maximum safety wbSAR, ensuring compliance with IEC limits. Results In normal operating mode, the RF power deposition reached wbSAR limit before the pbSAR10g limit. In the first level controlled operating mode, pbSAR10g limit is reached before the wbSAR limit in the knee, thoracic spine scanning scenarios, while the wbSAR limit is reached first in the pelvis scanning scenarios, making it the most potential-releasing (up to 33.33 %) scanning scenario. For head exposure, the head SAR10g limit is reached before the wbSAR limit, highlighting the necessity for strict SAR control. Moreover, we calculated the minimum allowable TR for common imaging sequences for reference. Conclusions Different RF exposure setups are necessary to meet safety standards in various scenarios. By implementing careful RF exposure setups in routine clinical scans, the high potential capacity of 3T MRI can be fully released.","PeriodicalId":8900,"journal":{"name":"Biomedical Engineering / Biomedizinische Technik","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142269798","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

Comparative evaluation of volumetry estimation from plain and contrast enhanced computed tomography liver images 从普通和造影剂增强型计算机断层扫描肝脏图像估算容积的比较评估

IF 1.7 4区医学

Biomedical Engineering / Biomedizinische Technik Pub Date : 2024-05-03 DOI: 10.1515/bmt-2022-0349

Lakshmipriya Balagourouchetty, Pragatheeswaran K. Jayanthi, Biju Pottakkat, Govindarajalou Ramkumar

{"title":"Comparative evaluation of volumetry estimation from plain and contrast enhanced computed tomography liver images","authors":"Lakshmipriya Balagourouchetty, Pragatheeswaran K. Jayanthi, Biju Pottakkat, Govindarajalou Ramkumar","doi":"10.1515/bmt-2022-0349","DOIUrl":"https://doi.org/10.1515/bmt-2022-0349","url":null,"abstract":"Objectives Surgery planning for liver tumour is carried out using contrast enhanced computed tomography (CECT) images to determine the optimal resection strategy and to assess the volume of liver and tumour. Current surgery planning tools interpret even the functioning liver cells present within the tumour boundary as tumour. Plain CT images provide inadequate information for treatment planning. This work attempts to address two shortcomings of existing surgery planning tools: (i) to delineate functioning liver cells from the non-functioning tumourous tissues within the tumour boundary and (ii) to provide 3D visualization and actual tumour volume from the plain CT images. Methods All slices of plain CT images containing liver are enhanced by means of fuzzy histogram equalization in Non-Subsampled Contourlet Transform (NSCT) domain prior to 3D reconstruction to clearly delineate liver, non-functioning tumourous tissues and functioning liver cells within the tumour boundary. The 3D analysis from plain and CECT images was carried out on five types of liver lesions viz. HCC, metastasis, hemangioma, cyst, and abscess along with normal liver. Results The study resulted in clear delineation of functional liver tissues from non-functioning tumourous tissues within the tumour boundary from CECT as well as plain CT images. The volume of liver calculated using the proposed approach is found comparable with that obtained using Myrian-XP, a currently followed surgery planning tool in clinical practice. Conclusions The obtained results from plain CT images will undoubtedly provide valuable diagnostic assistance and surgery planning even for the subset of patients for whom CECT acquisition is not advisable.","PeriodicalId":8900,"journal":{"name":"Biomedical Engineering / Biomedizinische Technik","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140841403","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

Sparse-view CT reconstruction based on group-based sparse representation using weighted guided image filtering 利用加权引导图像滤波技术，基于基于组的稀疏表示进行稀疏视图 CT 重建

IF 1.7 4区医学

Biomedical Engineering / Biomedizinische Technik Pub Date : 2024-04-10 DOI: 10.1515/bmt-2023-0581

Rong Xu, Yi Liu, Zhiyuan Li, Zhiguo Gui

{"title":"Sparse-view CT reconstruction based on group-based sparse representation using weighted guided image filtering","authors":"Rong Xu, Yi Liu, Zhiyuan Li, Zhiguo Gui","doi":"10.1515/bmt-2023-0581","DOIUrl":"https://doi.org/10.1515/bmt-2023-0581","url":null,"abstract":"Objectives In the past, guided image filtering (GIF)-based methods often utilized total variation (TV)-based methods to reconstruct guidance images. And they failed to reconstruct the intricate details of complex clinical images accurately. To address these problems, we propose a new sparse-view CT reconstruction method based on group-based sparse representation using weighted guided image filtering. Methods In each iteration of the proposed algorithm, the result constrained by the group-based sparse representation (GSR) is used as the guidance image. Then, the weighted guided image filtering (WGIF) was used to transfer the important features from the guidance image to the reconstruction of the SART method. Results Three representative slices were tested under 64 projection views, and the proposed method yielded the best visual effect. For the shoulder case, the PSNR can achieve 48.82, which is far superior to other methods. Conclusions The experimental results demonstrate that our method is more effective in preserving structures, suppressing noise, and reducing artifacts compared to other methods.","PeriodicalId":8900,"journal":{"name":"Biomedical Engineering / Biomedizinische Technik","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140603009","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

Actuators and transmission mechanisms in rehabilitation lower limb exoskeletons: a review 康复下肢外骨骼中的致动器和传动机构：综述

IF 1.7 4区医学

Biomedical Engineering / Biomedizinische Technik Pub Date : 2024-01-30 DOI: 10.1515/bmt-2022-0262

Norazam Aliman, Rizauddin Ramli, Mohammad Soleimani Amiri

{"title":"Actuators and transmission mechanisms in rehabilitation lower limb exoskeletons: a review","authors":"Norazam Aliman, Rizauddin Ramli, Mohammad Soleimani Amiri","doi":"10.1515/bmt-2022-0262","DOIUrl":"https://doi.org/10.1515/bmt-2022-0262","url":null,"abstract":"Research has shown that rehabilitation lower limb exoskeletons (RLLEs) are effective tools for improving recovery or regaining lower limb function. This device interacts with the limbs of patients. Thus, actuators and power transmission mechanisms are the key factors in determining smooth human‒machine interaction and comfort in physical therapy activities. A multitude of distinct technologies have been proposed. However, we questioned which consideration point in actuator selection and power transmission mechanisms are used for RLLE. A review of the technical characteristics and status of advanced RLLE designs is discussed. We review actuator selection for RLLE devices. Furthermore, the power transmission mechanisms over the years within each of the RLLE devices are presented. The development issues and possible research directions related to actuators and power transmission mechanisms are provided. Most RLLEs are still in the research phase, and only a few have been commercialized. The aim of this paper is to provide researchers with useful information for investigating technological progress and highlight the latest technological choices in RLLE development.","PeriodicalId":8900,"journal":{"name":"Biomedical Engineering / Biomedizinische Technik","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139648093","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

Abstracts of the 2023 Annual Meeting of the Austrian Society for Biomedical Engineering (ÖGBMT) 奥地利生物医学工程学会（ÖGBMT）2023 年年会摘要

IF 1.7 4区医学

Biomedical Engineering / Biomedizinische Technik Pub Date : 2023-12-01 DOI: 10.1515/bmt-2023-2002

引用次数: 0

Frontmatter 头版头条

4区医学

Biomedical Engineering / Biomedizinische Technik Pub Date : 2023-10-01 DOI: 10.1515/bmt-2023-frontmatter5

引用次数: 0

Computer-based analysis of the taper connection strength of different revision head and adapter sleeve designs. 通过计算机分析不同修正头和适配器套筒设计的锥形连接强度。

IF 1.7 4区医学

Biomedical Engineering / Biomedizinische Technik Pub Date : 2023-09-13 Print Date: 2024-04-25 DOI: 10.1515/bmt-2023-0066

Johanna Meier, Jessica Hembus, Rainer Bader, Danny Vogel

{"title":"Computer-based analysis of the taper connection strength of different revision head and adapter sleeve designs.","authors":"Johanna Meier, Jessica Hembus, Rainer Bader, Danny Vogel","doi":"10.1515/bmt-2023-0066","DOIUrl":"10.1515/bmt-2023-0066","url":null,"abstract":"Objectives: Ceramic revision heads, equipped with titanium adapter sleeves, are used in femoral head revision in total hip arthroplasty to avoid ceramic fracture due to the damaged taper.Methods: A finite element analysis of the taper connection strength of revision heads with varying head diameters combined with adapter sleeves of different lengths was conducted. The influence of various assembly forces, head diameter, and length of the adapter sleeves was evaluated. For two combinations, the pattern of contact pressure was evaluated when applying a simplified joint load (3 kN, 45° load angle). Experimental validation was conducted with 36 mm heads and adapter sleeves in size S, as well as 28 mm heads and adapter sleeves in size XL.Results: The pull-off force increased with higher assembly forces. Using larger head diameters and adapter sleeves led to decreased pull-off forces, a reduced contact surface, and less contact pressure. The contact pressure showed significant peaks and a diagonal pattern under 45° angle loading when assembly forces were less than 4 kN, and larger adapter sleeves were utilized.Conclusion: A sufficient assembly force should be ensured intraoperatively, especially with an increasing head diameter and adapter sleeve size, as lower assembly forces might lead to reduced taper connection strength.","PeriodicalId":8900,"journal":{"name":"Biomedical Engineering / Biomedizinische Technik","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10204794","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

Effects of a full-body electrostimulation garment application in a cohort of subjects with cerebral palsy, multiple sclerosis, and stroke on upper motor neuron syndrome symptoms 在脑瘫、多发性硬化症和中风患者队列中应用全身电刺激衣对上运动神经元综合征症状的影响

4区医学

Biomedical Engineering / Biomedizinische Technik Pub Date : 2023-09-12 DOI: 10.1515/bmt-2023-0271

Andreas Hahn, Susan Moeller, Arne Schlausch, Matilda Ekmann, Gautier de Chelle, Marie Westerlund, Frank Braatz, Winfried Mayr

{"title":"Effects of a full-body electrostimulation garment application in a cohort of subjects with cerebral palsy, multiple sclerosis, and stroke on upper motor neuron syndrome symptoms","authors":"Andreas Hahn, Susan Moeller, Arne Schlausch, Matilda Ekmann, Gautier de Chelle, Marie Westerlund, Frank Braatz, Winfried Mayr","doi":"10.1515/bmt-2023-0271","DOIUrl":"https://doi.org/10.1515/bmt-2023-0271","url":null,"abstract":"Abstract Objectives Dysfunction of the central nervous system may inflict spastic movement disorder (SMD). Electrical stimuli were identified as promising therapeutic option. Electrical stimulation provided by a 58-electrode full body garment was investigated based on data from regular trial fittings. Methods Data from 72 testees were investigated. Age averages 36.6 (19.8) ys with 44 females. The cohort spans infantile cerebral paresis (CP) (n=29), multiple sclerosis (MS) (n=23) and stroke (n=20). Data were stratified by etiology and an entry BBS Score<45. Results Effect sizes (Cohen`s d) related BBS, TUG, FGA, 10mWT, WMFT, EQ5D5L and Pain. Significance levels are indicated by *: p<0.05, **: p<0.01, ***: p<0.001, (t): p<0.1: CP: 1.64***, 0.29*, 1.59***, 0.76(t), 1.00***, 0.5*, 1.28***; MS: 1.83***, 0.83***, 1.28**, 1.07***, 0.93*, 1,11**, 0.78*; Stroke: 1.28**, 0.78**, 0.89, 0.92**, 0.71, 1.26*, 0.78*. Conclusions Multi-site transcutaneous electrical stimulation may increase ambulation related skills in subjects with SMD stemming from CP, MS and stroke. The results indicate effects on static and dynamic balance, fall risk, mobility, upper extremity improvement and an overall increase in health utility and a reduction in spasticity related pain. Effects are immediate as well as sustained. These results may inspire individual trial fittings and inform further controlled trials.","PeriodicalId":8900,"journal":{"name":"Biomedical Engineering / Biomedizinische Technik","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135878408","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

Abstracts of the 57th Annual Meeting of the German Society of Biomedical Engineering 26 – 28 September 2023, Duisburg, including: The Artificial Vision Symposium – The International Symposium on Visual Prosthetics 第57届德国生物医学工程学会年会摘要2023年9月26日至28日，杜伊斯堡，包括:人工视觉研讨会-视觉修复国际研讨会

IF 1.7 4区医学

Biomedical Engineering / Biomedizinische Technik Pub Date : 2023-09-01 DOI: 10.1515/bmte-2023-2001

引用次数: 0

Stimulation of spinal cord according to recorded theta hippocampal rhythm during rat move on treadmill. 根据记录的海马节律对大鼠在跑步机上运动时脊髓的刺激。

IF 1.7 4区医学

Biomedical Engineering / Biomedizinische Technik Pub Date : 2023-08-28 DOI: 10.1515/bmt-2022-0420

Shahin Rouhi, Saeid Rahmani, Faezeh Shanesazzadeh, Tala Ahmadvand, Mahrokh Namazi, Mehdi Fardmanesh, Sahar Kiani

{"title":"Stimulation of spinal cord according to recorded theta hippocampal rhythm during rat move on treadmill.","authors":"Shahin Rouhi, Saeid Rahmani, Faezeh Shanesazzadeh, Tala Ahmadvand, Mahrokh Namazi, Mehdi Fardmanesh, Sahar Kiani","doi":"10.1515/bmt-2022-0420","DOIUrl":"https://doi.org/10.1515/bmt-2022-0420","url":null,"abstract":"Objectives: Several studies have revealed that after spinal cord injury (SCI), in acute and sub-acute phase the spinal cord neurons below the injury are alive and could stimulate by use of electrical pulses. Spinal cord electrical stimulation could generate movement for paralyzed limbs and is a rehabilitation strategy for paralyzed patients. An innovative idea for controlling spinal cord electrical stimulation onset time is presented in current study.Methods: In our method, the time of applying electrical pulse on the spinal cord is according to rat behavioral movement and two movements behaviors are recognized only based on rat EEG theta rhythm on the treadmill line. Briefly, 5 rats were placed on the treadmill and the animals experienced zero or 12 m/min speeds.Results: These speeds were recognized based on EEG signals and off-line periodogram analysis. Finally, the electrical stimulation pulses had been applied to the spinal cord if the results of the EEG analysis had detected running behavior.Conclusions: These findings may guide future research in utilizing theta rhythms for the recognition of animal motor behavior and designing electrical stimulation systems based on it.","PeriodicalId":8900,"journal":{"name":"Biomedical Engineering / Biomedizinische Technik","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9933604","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