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2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)最新文献

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MRI analysis for hippocampus segmentation on a distributed infrastructure 分布式基础设施上海马分割的MRI分析
Pub Date : 2016-05-15 DOI: 10.1109/MEMEA.2016.7533716
S. Tangaro, N. Amoroso, M. Antonacci, M. Boccardi, M. Bocchetta, A. Chincarini, D. Diacono, G. Donvito, R. Errico, G. Frisoni, Tommaso Maggipinto, A. Monaco, F. Sensi, A. Tateo, R. Bellotti
Medical image computing raises new challenges due to the scale and the complexity of the required analyses. Medical image databases are currently available to supply clinical diagnosis. For instance, it is possible to provide diagnostic information based on an imaging biomarker comparing a single case to the reference group (controls or patients with disease). At the same time many sophisticated and computationally intensive algorithms have been implemented to extract useful information from medical images. Many applications would take great advantage by using scientific workflow technology due to its design, rapid implementation and reuse. However this technology requires a distributed computing infrastructure (such as Grid or Cloud) to be executed efficiently. One of the most used workflow manager for medical image processing is the LONI pipeline (LP), a graphical workbench developed by the Laboratory of Neuro Imaging (http://pipeline.loni.usc.edu). In this article we present a general approach to submit and monitor workflows on distributed infrastructures using LONI Pipeline, including European Grid Infrastructure (EGI) and Torque-based batch farm. In this paper we implemented a complete segmentation pipeline in brain magnetic resonance imaging (MRI). It requires time-consuming and data-intensive processing and for which reducing the computing time is crucial to meet clinical practice constraints. The developed approach is based on web services and can be used for any medical imaging application.
由于所需分析的规模和复杂性,医学图像计算提出了新的挑战。医学图像数据库目前可提供临床诊断。例如,可以提供基于成像生物标志物的诊断信息,将单个病例与参照组(对照组或患有疾病的患者)进行比较。同时,为了从医学图像中提取有用的信息,已经实现了许多复杂的计算密集型算法。科学的工作流技术具有可设计、可快速实现、可重用等优点,将在许多应用中发挥巨大的优势。然而,这种技术需要分布式计算基础设施(如Grid或Cloud)才能有效地执行。医学图像处理中最常用的工作流管理器之一是LONI管道(LP),这是神经成像实验室开发的图形工作台(http://pipeline.loni.usc.edu)。在本文中,我们介绍了一种使用LONI Pipeline在分布式基础设施上提交和监控工作流的通用方法,包括欧洲网格基础设施(EGI)和基于扭矩的批处理场。本文在脑磁共振成像(MRI)中实现了一个完整的分割流水线。它需要耗时且数据密集的处理,因此减少计算时间对于满足临床实践限制至关重要。所开发的方法基于web服务,可用于任何医学成像应用程序。
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引用次数: 0
Comprehensive system for the evaluation of the attention level of a driver 用于评估驾驶员注意力水平的综合系统
Pub Date : 2016-05-15 DOI: 10.1109/MeMeA.2016.7533710
S. Pullano, A. Fiorillo, A. L. Gatta, F. Lamonaca, D. L. Carní
Nowadays, monitoring the attention level of a driver is a useful tool for assuring a better degree of safety aboard motor vehicles. Recent literature reports different technologies that have been explored for evaluating various critical physical parameters of drivers. This paper presents an attempt to integrate different non-intrusive monitoring systems which include an eye-blink detection system which works by means of a camera and head-position monitoring system based on an ultrasonic transmitter/receiver network. The information retrieved by the comprehensive system will be of help either for the evaluation of the driver's condition or for boosting other devices often placed in the car such as an alcohol detection system which can pick up dangerous head positions. Two separate algorithms have been implemented and the experiment will be presented in order to validate the proposed systems and algorithms.
如今,监测驾驶员的注意力水平是确保机动车辆更好程度安全的有用工具。最近的文献报道了不同的技术已经探索评估各种关键物理参数的驱动程序。本文提出了一种整合不同的非侵入式监测系统的尝试,其中包括通过摄像头工作的眨眼检测系统和基于超声波发送/接收网络的头部位置监测系统。综合系统获取的信息将有助于评估驾驶员的状况,或增强汽车中其他常用设备的功能,如酒精检测系统,该系统可以检测出危险的头部位置。两个独立的算法已经实现,实验将提出,以验证所提出的系统和算法。
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引用次数: 16
Fiber Bragg grating sensors for spatially resolved measurements in ex-vivo pancreatic laser ablation 用于离体胰腺激光消融空间分辨测量的光纤布拉格光栅传感器
Pub Date : 2016-05-15 DOI: 10.1109/MeMeA.2016.7533806
D. Tosi, Abzal Adilzhan Kamilla Aliakhmet, P. Saccomandi, E. Schena, S. Silvestri, D. Duraibabu, S. Poeggel, G. Leen, E. Lewis
Laser ablation (LA) is an emerging technology for mini-invasive treatment of tumors, and operates by damaging cancer cells by means of focused light-induced selective heating. In-situ temperature monitoring, with micro-sensors, may be particularly beneficial for both estimating in real-time the LA efficacy, and build prediction and controls for LA procedures. In this paper, we present our latest results on spatially resolved temperature monitoring, based on fiber Bragg grating (FBG). We used in-line FBG arrays based on 6 and 35 FBGs to achieve spatially resolved thermal sensing in LA applied to porcine pancreas. The main experimental results and their implications are hereby discussed.
激光消融(LA)是一种新兴的微创肿瘤治疗技术,它通过聚焦光诱导的选择性加热来破坏癌细胞。利用微传感器进行现场温度监测,可能特别有利于实时估计LA的效果,并为LA过程建立预测和控制。本文介绍了基于光纤布拉格光栅(FBG)的空间分辨温度监测的最新成果。采用基于6和35 FBG的直列FBG阵列,实现了LA对猪胰腺的空间分辨热传感。本文讨论了主要实验结果及其意义。
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引用次数: 1
Electrical activation of nervous system by sonar-based electronic interface 基于声纳电子接口的神经系统电激活
Pub Date : 2016-05-15 DOI: 10.1109/MeMeA.2016.7533754
R. Citraro, E. Russo, G. Sarro, M. G. Bianco, M. Menniti, S. Pullano, A. Fiorillo
In this paper we investigated neural activation by means of electrical impulses delivered along the auditory pathway in rats. The pulsed electrical signals, generated by a bio-inspired sonar system and processed by an electronic interface, were used to stimulate the amygdala, the inferior colliculus and the auditory cortex. We modulated the neural activity through different signal patterns related to ultrasound echoes and then performed Principal Component Analysis in order to classify the ECoG response to stimuli. The statistical analysis revealed the existence of a significant difference among responses and background signals. In addition, Fourier Transform of ECoG traces evidenced an increase in beta content in the amygdala while it was found that gamma waves prevail in the inferior colliculus and the auditory cortex, the latter highlighting the ultrasound nature of the electrical stimuli.
本文研究了电脉冲在大鼠听觉通路上的神经激活。由仿生声纳系统产生并经过电子接口处理的脉冲电信号被用来刺激杏仁核、下丘和听觉皮层。我们通过与超声回波相关的不同信号模式来调节神经活动,然后进行主成分分析,以便对刺激的ECoG反应进行分类。统计分析表明,响应与背景信号之间存在显著差异。此外,ECoG的傅立叶变换表明杏仁核中β含量增加,同时发现伽马波在下丘和听觉皮层中普遍存在,后者突出了电刺激的超声性质。
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引用次数: 2
ARTSENS® Pen: A portable, image-free device for automated evaluation of vascular stiffness ARTSENS®笔:一种便携式,无图像设备,用于自动评估血管硬度
Pub Date : 2016-05-15 DOI: 10.1109/MeMeA.2016.7533787
J. Joseph, M. Shah, M. Sivaprakasam
Evaluation of vascular stiffness is significant in diagnosis for early detection of vascular injury and has potential in screening individuals at risk of future cardiovascular events. State of art techniques use an imaging system for measuring carotid artery stiffness, or rely on carotid-femoral pulse wave velocity (PWV) to evaluate vascular stiffness. These techniques are costly, require expertise to perform and are not amenable for scaling to the population level. To address this gap, we have developed ARTSENS® Pen, a high portable, small, ultrasound based instrument for automated evaluation of carotid artery stiffness. The device has an integrated hardware for ultrasound signal acquisition and digitization that operate along with any Windows tablet for data visualization and result display. Algorithms for real time signal processing and automated artery wall identification and tracking ensures a completely automated measurement of carotid artery stiffness with no operator input. The accuracy of automated arterial dimension measurements performed by ARTSENS®Pen is verified by phantom studies in comparison with a reference ultrasound imaging system. The ability of the device to provide reliable measures of arterial stiffness in-vivo is verified by a systematic study on 29 volunteers. The inter operator and intra-operator variability of stiffness index, β was evaluated to be 17% and 9% respectively. The ARTSENS® Pen was found to be capable of providing accurate and repeatable measures of arterial stiffness in an easy manner and has strong potential in large scale vascular screening.
血管僵硬度的评估对于早期发现血管损伤的诊断具有重要意义,并且在筛选未来心血管事件风险个体方面具有潜力。最先进的技术使用成像系统来测量颈动脉硬度,或依靠颈-股脉波速度(PWV)来评估血管硬度。这些技术成本昂贵,需要专业知识才能执行,并且不适合扩展到人口水平。为了解决这一差距,我们开发了ARTSENS®Pen,这是一种高度便携式,小型,基于超声的仪器,用于自动评估颈动脉硬度。该设备具有用于超声信号采集和数字化的集成硬件,可与任何Windows平板电脑一起操作,用于数据可视化和结果显示。实时信号处理和自动动脉壁识别和跟踪算法确保了颈动脉刚度的完全自动化测量,无需操作员输入。通过与参考超声成像系统比较,通过模拟研究验证了ARTSENS®Pen进行的自动动脉尺寸测量的准确性。通过对29名志愿者的系统研究,验证了该设备在体内提供可靠动脉硬度测量的能力。刚度指数β的算子间和算子内变异性分别为17%和9%。研究发现,ARTSENS®Pen能够以简单的方式提供准确且可重复的动脉硬度测量,在大规模血管筛查中具有很强的潜力。
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引用次数: 12
Adaptive eulerian video magnification methods to extract heart rate from thermal video 自适应欧拉视频放大方法从热视频中提取心率
Pub Date : 2016-05-15 DOI: 10.1109/MeMeA.2016.7533818
Stephanie L. Bennett, R. Goubran, F. Knoefel
The world's expanding and aging population has created a demand for inexpensive, unobtrusive, automated healthcare solutions. Eulerian Video Magnification (EVM) aids in the development of these solutions by allowing for the extraction of physiological signals from video data. This paper examines the potential of thermal video in conjunction with EVM to extract physiological measures, particularly heart rate. This paper also proposes an adaptive EVM approach to amplify the desired signal, while avoiding noise amplification. A subject, wearing a textile sensor band collecting ECG, sat still while both a thermal camera and an iPad camera captured video. The iPad video was subjected to EVM, using a wide bandpass filter and low magnification factor. Mean intensity signals for five Regions of Interest (ROIs) were then calculated to extract a signal representing heart rate. The ECG signal was used to validate the ROI resulting in the mean intensity signal best representing heart rate. The thermal video was then subjected to EVM using the same wide bandpass filter and the identified ideal ROI mean intensity post-processing. This signal was compared to the enhanced iPad video mean intensity signal to verify the correct signal was extracted. The original thermal video was subjected again to EVM processing and ROI mean intensity post-processing, this time using an adapted, targeted narrow bandpass filter. Results indicated that thermal video, in conjunction with the proposed adapted EVM method and ROI post-processing can reveal physiological signals like heart rate and limit the potential of revealing an amplified noise signal.
世界人口的不断增长和老龄化催生了对廉价、不显眼的自动化医疗保健解决方案的需求。欧拉视频放大(EVM)通过允许从视频数据中提取生理信号来帮助开发这些解决方案。本文探讨了热视频结合EVM提取生理指标的潜力,特别是心率。本文还提出了一种自适应EVM方法来放大期望信号,同时避免噪声放大。一名受试者戴着收集心电图的纺织传感器带,一动不动地坐着,热像仪和iPad摄像头都在拍摄视频。iPad视频进行EVM,使用宽带通滤波器和低放大系数。然后计算五个感兴趣区域(roi)的平均强度信号以提取代表心率的信号。利用心电信号验证ROI,得到最能代表心率的平均强度信号。然后使用相同的宽带通滤波器和确定的理想ROI平均强度后处理对热视频进行EVM。将该信号与增强后的iPad视频平均强度信号进行对比,验证提取的信号正确。原始热视频再次进行EVM处理和ROI平均强度后处理,这一次使用了适应性的、有针对性的窄带通滤波器。结果表明,热视频结合所提出的适应性EVM方法和ROI后处理可以显示心率等生理信号,并限制了显示放大噪声信号的可能性。
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引用次数: 31
SAR measurement and distribution in defined body volumes through the development of MRI phantoms SAR测量和分布在确定的身体体积通过发展MRI幻象
Pub Date : 2016-05-15 DOI: 10.1109/MeMeA.2016.7533700
A. A. Russo, Silvio Valeri, G. Baccani, Fabrizio Delia, R. Delia
The development of a measurement methodology for the SAR evaluation in a patient, undergoing MRI examination, is presented. A suitable phantom model has been created to provide information about both the absorbed SAR values in the interested irradiated volumes and the SAR distribution therein. At the same time, the method should be able to validate the SAR values, provided by the MR apparatus for each individual exam, through its own mathematical algorithm, in relation to the used sequences and the patient's characteristics. Since this algorithm is generally unknown, tests were performed using tomographs from two different manufacturers, in order to collect the greatest possible amount of data. Moreover, the creation of a phantom, suitable to measure the SAR for different sequences of an MRI device, can provide also “real-time” information about the status of the MR equipment, regarding the quality assurance program, requested by national legislation. Furthermore, “a priori” and accurate knowledge, as regards the chosen sequence and the energy rate released in a given quantity of material (i.e. SAR), would guarantee a safer use of MRI also for patients implanted with last-generation of pacemakers, electromagnetically compatible with MR devices with a flux density of the static magnetic field up to 1.5 tesla. The measurements were carried out utilizing the calorimetric method. This method evaluates the energy rate in unit time, if the specific heat of a compound and the difference between the temperatures before and after the sequence are known. For the optimization of the phantom sizes, five systems of different shape, dimension and geometry were created. The temperatures were measured by a reference thermometer with a sensibility of 0.01 °C, used for the calibration of the elements. Two filling materials were chosen for the phantoms: a saline solution of NaCl (0.06M) for the SAR measurements and an ECG commercial gel, for the evaluation of the SAR distribution.
一种测量方法的发展,SAR评估的病人,接受MRI检查,提出。建立了一个合适的模拟模型,以提供有关感兴趣的辐照体积中吸收的SAR值及其SAR分布的信息。同时,该方法应该能够通过自己的数学算法,根据所使用的序列和患者的特征,验证MR设备为每次单独检查提供的SAR值。由于该算法通常是未知的,因此使用来自两个不同制造商的断层扫描进行测试,以便收集尽可能多的数据。此外,创建一个适用于测量磁共振设备不同序列的SAR的模型,还可以提供有关磁共振设备状态的“实时”信息,根据国家立法要求的质量保证计划。此外,“先验”和准确的知识,关于所选择的序列和在给定数量的材料(即SAR)中释放的能量率,将保证对植入上一代起搏器的患者更安全地使用MRI,这些起搏器与静态磁场磁通密度高达1.5特斯拉的MR设备电磁兼容。测量是利用量热法进行的。如果化合物的比热和序列前后的温差已知,则该方法计算单位时间内的能率。为了优化模体尺寸,创建了五个不同形状、尺寸和几何形状的系统。温度由灵敏度为0.01°C的参考温度计测量,用于校准元素。我们为模型选择了两种填充材料:用于SAR测量的NaCl (0.06M)盐水溶液和用于评估SAR分布的ECG商用凝胶。
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引用次数: 1
Towards ultrasound hyperthermia safe treatments using computational intelligence techniques 利用计算智能技术实现超声热疗安全治疗
Pub Date : 2016-05-15 DOI: 10.1109/MEMEA.2016.7533814
M. Ruano, A. Ruano
A key feature for safe application of hyperthermia treatments is the efficient delimitation of the treatment region avoiding collateral damages. The efficacy of treatment depends on an ultrasound power intensity profile to accomplish the temperature clinically required. Many hyperthermia procedures proposed in the literature rely on a-priori knowledge of the physical properties of tissue. The soft computing models presented in this article are only based on measured data, collected from tissue phantoms reflecting the reactions of human tissues to ultrasounds. From homogeneous to heterogeneous tissues, different soft computing techniques were developed accordingly to experimental constraints. The present state of development is nearly approaching the identification of a computational model to be safety applied in in-vivo hyperthermia sessions.
热疗安全应用的一个关键特征是有效划定治疗区域,避免附带损害。治疗的效果取决于超声功率强度分布,以达到临床所需的温度。文献中提出的许多热疗程序依赖于对组织物理特性的先验知识。本文中提出的软计算模型仅基于从反映人体组织对超声波反应的组织幻象中收集的测量数据。从均匀组织到非均匀组织,不同的软计算技术根据实验的限制而发展。目前的发展状态几乎接近于确定一个计算模型,以安全应用于体内热疗会议。
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引用次数: 0
Optical polarization properties of zeolite thin films: Aspects for medical applications 沸石薄膜的光学偏振特性:医学应用方面
Pub Date : 2016-05-15 DOI: 10.1109/MeMeA.2016.7533757
A. Fiorillo, S. P. Rudenko, M. Stetsenko, L. S. Maksimenko
Zeolite porous films have been produced by spin coating deposition at low temperature according to a procedure fully compatible with integrated circuit technology. Optical polarization properties of the deposited film have been studied by the modulation-polarization spectroscopy technique. Low-dielectric properties and internal porosity structure of the zeolite on Si wafer can be obtained. The aspects of these studies for biosensor applications are discussed, although in the beginning the zeolite thin films undergoes to studying.
采用与集成电路技术完全兼容的低温自旋镀膜方法制备了沸石多孔膜。利用调制偏振光谱技术研究了沉积膜的光偏振特性。在硅片上获得了低介电性能和内部孔隙结构。讨论了这些研究在生物传感器应用中的各个方面,尽管在开始时沸石薄膜经历了研究。
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引用次数: 3
Measuring the drug absorbed by biological tissues in laboratory emulation of dermatological topical treatments 皮肤局部治疗实验模拟中生物组织吸收药物的测定
Pub Date : 2016-05-15 DOI: 10.1109/MeMeA.2016.7533794
P. Arpaia, U. Cesaro, N. Moccaldi
An experimental procedure for measuring the drug absorbed by a biological tissue in laboratory emulation of dermatological topical treatments is proposed. Laboratory emulation is based on the analysis of the eggplant electrical reaction to the injection of drug. Eggplant and human tissue are both well modeled by a distributed circuit model described by the ColeCole empirical equation. An exploratory measurement campaign aimed at investigating the relationship between the injected drug amount and the measured impedance is reported. The basic ideas, the measurement system design, and the proposed measurement procedure are illustrated. Then, its feasibility is proved experimentally and the results of the metrological characterization are reported and discussed. Results point out that, by a “simple” measurement of the impedance module (and not a spectroscopy), the amount of injected drug can be assessed by acceptable uncertainty.
提出了一种在皮肤局部治疗的实验室模拟中测量生物组织吸收药物的实验方法。实验室仿真是在分析茄子对药物注射电反应的基础上进行的。用ColeCole经验方程描述的分布式电路模型可以很好地模拟茄子和人体组织。本文报道了一项探索性测量活动,旨在研究注射药物量与测量阻抗之间的关系。阐述了测量的基本思想、测量系统的设计和测量程序。实验证明了该方法的可行性,并对计量表征结果进行了报道和讨论。结果指出,通过阻抗模块的“简单”测量(而不是光谱学),可以通过可接受的不确定度来评估注射药物的量。
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引用次数: 10
期刊
2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)
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