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SATORI: Amplification-free digital RNA detection method for the diagnosis of viral infections. SATORI:用于病毒感染诊断的无扩增数字 RNA 检测方法。
Q4 ENGINEERING, BIOMEDICAL Pub Date : 2023-07-12 eCollection Date: 2023-01-01 DOI: 10.2142/biophysico.bppb-v20.0031
Tatsuya Iida, Hajime Shinoda, Rikiya Watanabe

With the recent global outbreak of COVID-19, there is an urgent need to establish a versatile diagnostic method for viral infections. Gene amplification test or antigen test are widely used to diagnose viral infections; however, these methods generally have technical drawbacks either in terms of sensitivity, accuracy, or throughput. To address this issue, we recently developed an amplification-free digital RNA detection method (SATORI), which can identify and detect viral genes at the single-molecule level in approximately 9 min, satisfying almost all detection performance requirements for the diagnosis of viral infections. In addition, we also developed practical platforms for SATORI, such as an automated platform (opn-SATORI) and a low-cost compact fluorescence imaging system (COWFISH), with the aim of application in clinical settings. Our latest technologies can be inherently applied to diagnose a variety of RNA viral infections, such as COVID-19 and Influenza A/B, and therefore, we expect that SATORI will be established as a versatile platform for point-of-care testing of a wide range of infectious diseases, thus contributing to the prevention of future epidemics. This article is an extended version of the Japanese article published in the SEIBUTSU BUTSURI Vol. 63, p. 115-118 (2023).

最近,COVID-19 在全球爆发,因此迫切需要建立一种多功能的病毒感染诊断方法。基因扩增检测或抗原检测被广泛用于诊断病毒感染,但这些方法在灵敏度、准确性或通量方面普遍存在技术缺陷。针对这一问题,我们最近开发了一种无扩增的数字 RNA 检测方法(SATORI),它能在约 9 分钟内识别和检测单分子水平的病毒基因,几乎能满足病毒感染诊断的所有检测性能要求。此外,我们还开发了 SATORI 的实用平台,如自动化平台(opn-SATORI)和低成本紧凑型荧光成像系统(COWFISH),旨在应用于临床。我们的最新技术本质上可用于诊断各种 RNA 病毒感染,如 COVID-19 和甲型/乙型流感,因此,我们期待 SATORI 成为一个多功能平台,用于各种传染病的床旁检测,从而为预防未来的流行病做出贡献。本文是发表在《SEIBUTSU BUTSURI》第 63 卷第 115-118 页(2023 年)上的日文文章的扩展版。
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引用次数: 0
Diurnal Variation in Tear Film Lipid Layer Using Smartphone-based Interferometry 基于智能手机干涉测量的泪膜脂质层日变化
IF 1 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2023-01-01 DOI: 10.14326/abe.12.163
Yoshiro Okazaki, Mamoru Iwabuchi, N. Yokoi
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引用次数: 0
Dispositional Flow and Related Psychological Measures Associated with Heart Rate Diurnal Rhythm 与心率日节律相关的性情流和相关心理测量
IF 1 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2023-01-01 DOI: 10.14326/abe.12.9
Omid Jamalipournokandeh, J. Hori, K. Asakawa, K. Yana
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引用次数: 0
Development of a Training Simulator for Caregivers' Toothbrushing Skill Using Virtual Reality 基于虚拟现实技术的护理人员刷牙技能训练模拟器的开发
IF 1 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2023-01-01 DOI: 10.14326/abe.12.91
Nene Mouri, M. Sasaki, Taichi Yagimaki, Marie Murakami, K. Igari, Keiichi Sasaki
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引用次数: 0
Goniometric Examination of Diffuse Reflectance of a Skin Phantom in the Wavelength Range from 400 to 1600 nm 皮肤幻影在400 ~ 1600 nm波长范围内漫反射的角学检测
IF 1 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2023-01-01 DOI: 10.14326/abe.12.108
Yota Kikuchi, Seiki Nagahori, Hironori Suzuki, Takashi Jin, Y. Nomura
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引用次数: 0
Determination of Biphasic Menstrual Cycle Based on the Fluctuation of Abdominal Skin Temperature during Sleep 基于睡眠时腹部皮肤温度波动的双相月经周期测定
IF 1 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2023-01-01 DOI: 10.14326/abe.12.28
Y. Murayama, Aiko Uemura, M. Kitazawa, J. Toyotani, Asako Taniuchi, T. Togawa
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引用次数: 1
Electric Field Regression and Error Variance Estimation for Transcranial Magnetic Stimulation using Deep Neural Networks 基于深度神经网络的经颅磁刺激电场回归及误差方差估计
Q4 ENGINEERING, BIOMEDICAL Pub Date : 2023-01-01 DOI: 10.14326/abe.12.225
Toyohiro Maki, Tatsuya Yokota, Akimasa Hirata, Hidekata Hontani
Transcranial magnetic stimulation (TMS) is a widely used non-invasive neurostimulation technique in neuroscience and in the treatment of psychiatric disorders. By placing a TMS coil over a patient's head, neurons in the brain can be electromagnetically stimulated through the induction of an electric field (E-field). Accurate estimation of the E-field induced in a patient's head is crucial for determining the stimulated area of the brain. The electromagnetic simulation for E-field estimation involves two processes: the development of a volume conductor model (VCM) to determine the electrical conductivity at each position of the brain from a head magnetic resonance (MR) image, and the computation of the E-field on the VCM. Currently, neither of these processes can be performed in real-time. Achieving real-time estimation would greatly assist in determining the appropriate coil position and direction to stimulate the target regions in the patient's brain. In recent years, several methods utilizing deep neural networks (DNNs) have been proposed to estimate E-fields from MR images in real-time. These methods construct a regressor of the E-field using a set of simulated E-fields as training data to estimate the E-field. However, the reliability of these regressors in clinical applications could be improved by incorporating uncertainty estimation of the regressed variables, although this has not been reported. In this study, we enhanced the accuracy of E-field strength estimation by first regressing the E-field and then computing the norm of the E-field vectors, instead of directly regressing the E-field strength. In addition, we investigated the statistical uncertainty of the regressed E-fields using DNN. It should be noted that the E-fields estimated by the regressors are random variables. To evaluate the uncertainty of this application, we employed MCDropout, a well-known Bayesian estimation method. The uncertainty of the regressed E-field was evaluated for each anatomical tissue of the brain, to examine the relationship between uncertainty and depth from the coil. The experimental results of this evaluation are presented quantitatively.
经颅磁刺激(TMS)是一种广泛应用于神经科学和精神疾病治疗的无创神经刺激技术。通过将TMS线圈置于患者头上,大脑中的神经元可以通过感应电场(E-field)受到电磁刺激。准确估计患者头部产生的电场对于确定大脑的受刺激区域至关重要。电磁场估计的电磁模拟包括两个过程:建立体积导体模型(VCM),根据头部磁共振(MR)图像确定大脑各位置的电导率,以及在VCM上计算电磁场。目前,这两个进程都不能实时执行。实现实时估计将极大地有助于确定适当的线圈位置和方向,以刺激患者大脑的目标区域。近年来,人们提出了几种利用深度神经网络(dnn)从磁共振图像中实时估计电磁场的方法。这些方法使用一组模拟的电场作为训练数据来构建电场的回归量来估计电场。然而,这些回归量在临床应用中的可靠性可以通过纳入回归变量的不确定性估计来提高,尽管这还没有报道。本文采用先对电场进行回归,再计算电场矢量范数的方法来提高电场强度估计的精度,而不是直接对电场强度进行回归。此外,我们还利用深度神经网络研究了回归电磁场的统计不确定性。需要注意的是,由回归量估计的e场是随机变量。为了评估该应用程序的不确定性,我们采用了MCDropout,一种著名的贝叶斯估计方法。对每个脑解剖组织的回归电磁场的不确定度进行评估,以检查不确定度与线圈深度之间的关系。定量地给出了该评价的实验结果。
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引用次数: 0
Transepidermal Water Loss Estimation Model for Evaluating Skin Barrier Function 评估皮肤屏障功能的经皮失水估算模型
IF 1 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2023-01-01 DOI: 10.14326/abe.12.1
Osamu Uehara, T. Kusuhara, Takao Nakamura
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引用次数: 2
Performance Evaluation of Compound Plane-Wave Imaging Combined with the Generalized Coherence Factor 结合广义相干系数的复合平面波成像性能评价
Q4 ENGINEERING, BIOMEDICAL Pub Date : 2023-01-01 DOI: 10.14326/abe.12.204
Zainab R. Alomari, Wasan M. Abdulatef, Mahmod A. Al-Zubaidy
Compound plane-wave imaging (CPWI) is a widely used and investigated imaging technique in medical ultrasound because it provides high quality ultrafast imaging for recent applications such as elastography. CPWI can be either coherent to provide high resolution and reduce sidelobe, or incoherent to provide high speckle homogeneity. To further improve imaging quality, coherence-based factors are used for weighting the output of ultrasound beamformers. This work studied the effects of the number of compounded frames and the step between these frames on the imaging quality produced by coherent and incoherent CPWI in the presence of the generalized coherence factor (GCF). The quality of the produced images of two different RF datasets was assessed in two different scenarios, in addition to conducting cyst phantom simulations. Results showed that the amount of image contrast improved by GCF increased, while the amount of resolution improved by GCF decreased, with the increase in step between frames. The same results were obtained in both types of CPWI. On the other hand, increasing the number of frames had almost no effect on the amounts of improvement provided by GCF. When CPWI is used in ultrafast imaging, it is important to monitor frame rates as well as imaging quality; these two factors are, respectively, inversely and directly proportional to the number of compounding frames. Therefore, the results of this research provide guidelines for accurate angle selection for CPWI so that a trade-off between imaging quality and frame rate is achieved.
复合平面波成像(CPWI)是一种被广泛应用和研究的医学超声成像技术,因为它为弹性成像等新应用提供了高质量的超快成像。CPWI可以是相干的以提供高分辨率和减少旁瓣,也可以是非相干的以提供高散斑均匀性。为了进一步提高成像质量,采用相干因子对超声波束形成器的输出进行加权。本工作研究了在广义相干系数(GCF)存在下,复合帧数和这些帧之间的步长对相干和非相干CPWI产生的成像质量的影响。除了进行囊肿幻象模拟外,还在两种不同的情况下评估了两种不同射频数据集产生的图像的质量。结果表明,随着帧间步长的增加,GCF提高图像对比度的量增加,而GCF提高图像分辨率的量减少。两种CPWI的结果相同。另一方面,增加帧数对GCF提供的改进量几乎没有影响。当CPWI用于超快成像时,重要的是监控帧率和成像质量;这两个因素分别与复合框架的数量成反比和成正比。因此,本研究结果为CPWI的精确角度选择提供了指导,从而实现了成像质量和帧率之间的权衡。
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引用次数: 0
Operating Room Surveillance Video Analysis for Group Activity Recognition 手术室监控视频分析用于群体活动识别
IF 1 Q4 ENGINEERING, BIOMEDICAL Pub Date : 2023-01-01 DOI: 10.14326/abe.12.171
Koji Yokoyama, Goshiro Yamamoto, Chang Liu, Kazumasa Kishimoto, T. Kuroda
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引用次数: 0
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Advanced Biomedical Engineering
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