Journal of medical engineering最新文献

Optical Coherence Tomography: Basic Concepts and Applications in Neuroscience Research. 光学相干层析成像：神经科学研究的基本概念和应用。

Journal of medical engineering Pub Date : 2017-01-01 Epub Date: 2017-10-29 DOI: 10.1155/2017/3409327

Mobin Ibne Mokbul

{"title":"Optical Coherence Tomography: Basic Concepts and Applications in Neuroscience Research.","authors":"Mobin Ibne Mokbul","doi":"10.1155/2017/3409327","DOIUrl":"10.1155/2017/3409327","url":null,"abstract":"Optical coherence tomography is a micrometer-scale imaging modality that permits label-free, cross-sectional imaging of biological tissue microstructure using tissue backscattering properties. After its invention in the 1990s, OCT is now being widely used in several branches of neuroscience as well as other fields of biomedical science. This review study reports an overview of OCT's applications in several branches or subbranches of neuroscience such as neuroimaging, neurology, neurosurgery, neuropathology, and neuroembryology. This study has briefly summarized the recent applications of OCT in neuroscience research, including a comparison, and provides a discussion of the remaining challenges and opportunities in addition to future directions. The chief aim of the review study is to draw the attention of a broad neuroscience community in order to maximize the applications of OCT in other branches of neuroscience too, and the study may also serve as a benchmark for future OCT-based neuroscience research. Despite some limitations, OCT proves to be a useful imaging tool in both basic and clinical neuroscience research.","PeriodicalId":90600,"journal":{"name":"Journal of medical engineering","volume":"2017 ","pages":"3409327"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5682075/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35623438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Automated Detection of Motion Artefacts in MR Imaging Using Decision Forests. 基于决策森林的磁共振成像运动伪影自动检测。

Journal of medical engineering Pub Date : 2017-01-01 Epub Date: 2017-06-11 DOI: 10.1155/2017/4501647

Benedikt Lorch, Ghislain Vaillant, Christian Baumgartner, Wenjia Bai, Daniel Rueckert, Andreas Maier

{"title":"Automated Detection of Motion Artefacts in MR Imaging Using Decision Forests.","authors":"Benedikt Lorch, Ghislain Vaillant, Christian Baumgartner, Wenjia Bai, Daniel Rueckert, Andreas Maier","doi":"10.1155/2017/4501647","DOIUrl":"https://doi.org/10.1155/2017/4501647","url":null,"abstract":"The acquisition of a Magnetic Resonance (MR) scan usually takes longer than subjects can remain still. Movement of the subject such as bulk patient motion or respiratory motion degrades the image quality and its diagnostic value by producing image artefacts like ghosting, blurring, and smearing. This work focuses on the effect of motion on the reconstructed slices and the detection of motion artefacts in the reconstruction by using a supervised learning approach based on random decision forests. Both the effects of bulk patient motion occurring at various time points in the acquisition on head scans and the effects of respiratory motion on cardiac scans are studied. Evaluation is performed on synthetic images where motion artefacts have been introduced by altering the k-space data according to a motion trajectory, using the three common k-space sampling patterns: Cartesian, radial, and spiral. The results suggest that a machine learning approach is well capable of learning the characteristics of motion artefacts and subsequently detecting motion artefacts with a confidence that depends on the sampling pattern.","PeriodicalId":90600,"journal":{"name":"Journal of medical engineering","volume":"2017 ","pages":"4501647"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2017/4501647","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35158037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 29

Experimental Gait Analysis to Study Stress Distribution of the Human Foot. 实验步态分析研究人体足部应力分布。

Journal of medical engineering Pub Date : 2017-01-01 Epub Date: 2017-11-02 DOI: 10.1155/2017/3432074

Vidya K Nandikolla, Robin Bochen, Steven Meza, Allan Garcia

{"title":"Experimental Gait Analysis to Study Stress Distribution of the Human Foot.","authors":"Vidya K Nandikolla, Robin Bochen, Steven Meza, Allan Garcia","doi":"10.1155/2017/3432074","DOIUrl":"https://doi.org/10.1155/2017/3432074","url":null,"abstract":"Researchers and clinicians are increasingly using plantar pressure and force measurement system to evaluate foot functions. This research evaluates the quality and reliability of a Tekscan HR mat to study the plantar pressures and forces acting during walking, running, jumping, and standing of healthy subjects. The following regions of the foot were investigated: heel, mid foot, metatarsophalangeal joint, hallux, and the toes. The arches of both feet of the three healthy subjects in the gait analysis were presented which addresses the balancing issues of the body during locomotion. The results indicated that the peaks at the big toe (79.4 ± 8.5 N/cm2, p = 0.0001) were the maximum compared to forefoot (40.3 ± 3.3 N/cm2, p = 0.001), to midfoot (7.5 ± 1.3 N/cm2, p = 0.001), and to heel (27.8 ± 3.9 N/cm2, p = 0.0002) for jump activity. The running activity demonstrated similar results as jump where the maximum peak pressures were absorbed at the big toe region. The heel region during running (86.3 ± 12.6 N/cm2, p = 0.001) showed three times the pressure peak compared to the jump land (27.8 ± 3.9 N/cm2, p = 0.0002) activity. The measurement system proved to be highly capable of detecting heel strike and toe-off moments.","PeriodicalId":90600,"journal":{"name":"Journal of medical engineering","volume":"2017 ","pages":"3432074"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2017/3432074","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35243053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 29

Optimization of a Functionally Graded Material Stem in the Femoral Component of a Cemented Hip Arthroplasty: Influence of Dimensionality of FGM. 优化骨水泥髋关节成形术股骨组件中的功能分级材料柄：FGM 尺寸的影响。

Journal of medical engineering Pub Date : 2017-01-01 Epub Date: 2017-06-21 DOI: 10.1155/2017/3069351

Abdellah Ait Moussa, Rohan Yadav

引用次数: 0

Gradient Artefact Correction and Evaluation of the EEG Recorded Simultaneously with fMRI Data Using Optimised Moving-Average. 利用优化移动平均对与fMRI同时记录的脑电进行梯度伪影校正和评价。

Journal of medical engineering Pub Date : 2016-01-01 Epub Date: 2016-06-28 DOI: 10.1155/2016/9614323

José L Ferreira, Yan Wu, René M H Besseling, Rolf Lamerichs, Ronald M Aarts

{"title":"Gradient Artefact Correction and Evaluation of the EEG Recorded Simultaneously with fMRI Data Using Optimised Moving-Average.","authors":"José L Ferreira, Yan Wu, René M H Besseling, Rolf Lamerichs, Ronald M Aarts","doi":"10.1155/2016/9614323","DOIUrl":"https://doi.org/10.1155/2016/9614323","url":null,"abstract":"Over the past years, coregistered EEG-fMRI has emerged as a powerful tool for neurocognitive research and correlated studies, mainly because of the possibility of integrating the high temporal resolution of the EEG with the high spatial resolution of fMRI. However, additional work remains to be done in order to improve the quality of the EEG signal recorded simultaneously with fMRI data, in particular regarding the occurrence of the gradient artefact. We devised and presented in this paper a novel approach for gradient artefact correction based upon optimised moving-average filtering (OMA). OMA makes use of the iterative application of a moving-average filter, which allows estimation and cancellation of the gradient artefact by integration. Additionally, OMA is capable of performing the attenuation of the periodic artefact activity without accurate information about MRI triggers. By using our proposed approach, it is possible to achieve a better balance than the slice-average subtraction as performed by the established AAS method, regarding EEG signal preservation together with effective suppression of the gradient artefact. Since the stochastic nature of the EEG signal complicates the assessment of EEG preservation after application of the gradient artefact correction, we also propose a simple and effective method to account for it. ","PeriodicalId":90600,"journal":{"name":"Journal of medical engineering","volume":"2016 ","pages":"9614323"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2016/9614323","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34754857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Possibilities of Preoperative Medical Models Made by 3D Printing or Additive Manufacturing. 术前医学模型的可能性由3D打印或增材制造。

Journal of medical engineering Pub Date : 2016-01-01 Epub Date: 2016-06-28 DOI: 10.1155/2016/6191526

Mika Salmi

引用次数: 40

Potential of M-Wave Elicited by Double Pulse for Muscle Fatigue Evaluation in Intermittent Muscle Activation by Functional Electrical Stimulation for Motor Rehabilitation. 双脉冲诱发的m波电位在功能电刺激间歇肌活化运动康复中的肌肉疲劳评价。

Journal of medical engineering Pub Date : 2016-01-01 Epub Date: 2016-03-27 DOI: 10.1155/2016/6957287

Naoto Miura, Takashi Watanabe

{"title":"Potential of M-Wave Elicited by Double Pulse for Muscle Fatigue Evaluation in Intermittent Muscle Activation by Functional Electrical Stimulation for Motor Rehabilitation.","authors":"Naoto Miura, Takashi Watanabe","doi":"10.1155/2016/6957287","DOIUrl":"https://doi.org/10.1155/2016/6957287","url":null,"abstract":"Clinical studies on application of functional electrical stimulation (FES) to motor rehabilitation have been increasing. However, muscle fatigue appears early in the course of repetitive movement production training by FES. Although M-wave variables were suggested to be reliable indices of muscle fatigue in long lasting constant electrical stimulation under the isometric condition, the ability of M-wave needs more studies under intermittent stimulation condition, because the intervals between electrical stimulations help recovery of muscle activation level. In this paper, M-waves elicited by double pulses were examined in muscle fatigue evaluation during repetitive movements considering rehabilitation training with surface electrical stimulation. M-waves were measured under the two conditions of repetitive stimulation: knee extension force production under the isometric condition and the dynamic movement condition by knee joint angle control. Amplitude of M-wave elicited by the 2nd pulse of a double pulse decreased during muscle fatigue in both measurement conditions, while the change in M-waves elicited by single pulses in a stimulation burst was not relevant to muscle fatigue in repeated activation with stimulation interval of 1 s. Fatigue index obtained from M-waves elicited by 2nd pulses was suggested to provide good estimation of muscle fatigue during repetitive movements with FES. ","PeriodicalId":90600,"journal":{"name":"Journal of medical engineering","volume":"2016 ","pages":"6957287"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2016/6957287","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34487914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Automated Cough Assessment on a Mobile Platform. 移动平台上的自动咳嗽评估。

Journal of medical engineering Pub Date : 2014-01-01 DOI: 10.1155/2014/951621

Mark Sterling, Hyekyun Rhee, Mark Bocko

引用次数: 33

Kaczmarz Iterative Projection and Nonuniform Sampling with Complexity Estimates. 具有复杂度估计的Kaczmarz迭代投影和非均匀抽样。

Journal of medical engineering Pub Date : 2014-01-01 Epub Date: 2014-12-14 DOI: 10.1155/2014/908984

Tim Wallace, Ali Sekmen

{"title":"Kaczmarz Iterative Projection and Nonuniform Sampling with Complexity Estimates.","authors":"Tim Wallace, Ali Sekmen","doi":"10.1155/2014/908984","DOIUrl":"https://doi.org/10.1155/2014/908984","url":null,"abstract":"Kaczmarz's alternating projection method has been widely used for solving mostly over-determined linear system of equations A x = b in various fields of engineering, medical imaging, and computational science. Because of its simple iterative nature with light computation, this method was successfully applied in computerized tomography. Since tomography generates a matrix A with highly coherent rows, randomized Kaczmarz algorithm is expected to provide faster convergence as it picks a row for each iteration at random, based on a certain probability distribution. Since Kaczmarz's method is a subspace projection method, the convergence rate for simple Kaczmarz algorithm was developed in terms of subspace angles. This paper provides analyses of simple and randomized Kaczmarz algorithms and explains the link between them. New versions of randomization are proposed that may speed up convergence in the presence of nonuniform sampling, which is common in tomography applications. It is anticipated that proper understanding of sampling and coherence with respect to convergence and noise can improve future systems to reduce the cumulative radiation exposures to the patient. Quantitative simulations of convergence rates and relative algorithm benchmarks have been produced to illustrate the effects of measurement coherency and algorithm performance, respectively, under various conditions in a real-time kernel. ","PeriodicalId":90600,"journal":{"name":"Journal of medical engineering","volume":"2014 ","pages":"908984"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/908984","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34451296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1