检索结果-南通市图书馆

Cervical Characterization with Tactile-Ultrasound Probe

Open Journal of Obstetrics and Gynecology 2020年第1期10卷 85-99页

作者： Vladimir Egorov todd rosen Heather van Raalte Viktors Kurtenoks Advanced Tactile Imaging Trenton NJ USA. Department of Obstetrics Rutgers Robert Wood Johnson Medical School New Brunswick NJ USA. Princeton Urogynecology Princeton NJ USA.

Background: Premature cervical softening and shortening may be considered an early mechanical failure that predisposes to preterm birth. Preliminary clinical studies demonstrate that cervical elastography may be able to quantify this phenomenon and predict spontaneous preterm delivery. Objective: To explore a new approach for cervix elasticity and length measurements with tactile-ultrasound probe. Methods: Cervix probe has tactile array and ultrasound transducer designed to apply controllable load to cervix and acquire stress-strain data for calculation of cervical elasticity (Young’s modulus) and cervical length for four cervix sectors. Average values, standard deviations, intraclass correlation coefficients and the 95% limits of agreement (Bland-Altman plots) were estimated. Results: Ten non-pregnant and ten pregnant women were examined with the probe. The study with non-pregnant women demonstrated a reliable acquisition of the tactile signals. The ultrasound signals had a prolonged appearance;identification of the internal os of the cervix in these signals was not reliable. The study with pregnant women with the gestational age of 25.4 ± 2.3 weeks demonstrated reliable data acquisition with real-time visualization of the ultrasound signals. Average values for cervical elasticity and standard deviations of 19.7 ± 15.4 kPa and length of 30.7 ± 6.6 mm were calculated based on two measurements per 4 sectors. Measurement repeatability calculated as intraclass correlation coefficients between two measurements at the same cervix sector on pregnant women was found to be 0.97 for cervical elasticity and 0.93 for the cervical length. The 95% limits of agreement of 1) cervical elasticity were from ?22.4% to +14.9%, and 2) cervical length from ?13.3% to +16.5%. Conclusions: This study demonstrated clinically acceptable measurement performance and reproducibility. The availability of stress-strain data allowed the computation of cervical elasticity and length. This approach h

关键词： Cervical Elasticity Cervical Length Tactile Ultrasound Elastography Premature Cervical Softening Spontaneous Preterm Delivery

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Characterization of Perineum Elasticity and Pubic Bone-Perineal Critical Distance with a Novel Tactile Probe: Results of an Intraobserver Reproducibility Study

引用

Open Journal of Obstetrics and Gynecology 2020年第4期10卷 493-503页

作者： Justin S. Brandt todd rosen Heather Van Raalte Viktors Kurtenos Vladimir Egorov Department of Obstetrics Gynecology and Reproductive Sciences Division of Maternal-Fetal Medicine Rutgers Robert Wood Johnson Medical School New Brunswick NJ USA. Princeton Urogynecology Princeton NJ USA. Advanced Tactile Imaging Inc. Trenton NJ USA.

Background: Tactile imaging provides biomechanical mapping of soft tissues. Objective biomechanical and anatomical assessment of critical structures within the vagina and pelvis may allow development and validation of a clinical tool that could assist with clinical decisions regarding obstetrical procedures and mode of delivery. Objective: To assess intraobserver reproducibility of measurements of perineal elasticity and pubic bone-perineal critical distance with a novel tactile probe in pregnant women. Methods: An Antepartum Tactile Imager (ATI) was designed with a vaginal probe resembling a fetal skull. The probe comprises 128 tactile sensors on a double curved surface and measures 46 mm in width and 72 mm in length. The probe has a motion tracking sensor that allows acquisition of 3D tactile images. There were two arms of the study. In the first arm, biomechanical mapping of the perineum and pelvic bone location was performed in 10 non-pregnant women for purposes of demonstrating safety and feasibility. In the second arm, biomechanical mapping was performed in 10 pregnant women to explore intraobserver reproducibility. Each subject had two standardized examinations over 3 - 5 minutes by the same observer. Examination comfort and pain levels were assessed by post-procedure survey. Reproducibility was analyzed by intraclass correlation coefficients (ICC) with 95% confidence intervals and Bland-Altman plots. Bias and the 95% limits of agreement were also calculated. Results: The safety and feasibility arm of the study demonstrated high degree of safety and tolerability and reliable acquisition of tactile signals. In the reproducibility arm, 10 pregnant women were recruited at mean gestational age of 34.2 ± 6.5 weeks. The mean perineum elasticity (Young’s modulus, E) was 9.8 ± 5.9 kPa, and the mean pubic bone-perineal critical distance (D) at 20 kPa load was 34.6 ± 6.2 mm. The ICC was 0.97 [95% confidence interval (CI) 0.91, 0.99] and 0.82 [CI 0.44, 0.95] for E and D

关键词： Perineal Elasticity Tactile Imaging Elastography Antepartum Predictive Model Delivery Mode Perineum Maternal Birth Trauma

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Evaluating the Efficacy of Cervical Tactile Ultrasound Technique as a Predictive Tool for Spontaneous Preterm Birth

引用

Open Journal of Obstetrics and Gynecology 2024年第5期14卷 832-846页

作者： Vladimir Egorov todd rosen Jennifer Hill Meena Khandelwal Victors Kurtenoks Brendan Francy Noune Sarvazyan Advanced Tactile Imaging Inc. Ewing New Jersey USA Department of Obstetrics Gynecology and Reproductive Sciences Rutgers Robert Wood Johnson Medical School New Brunswick New Jersey USA Department of Maternal-Fetal Medicine Cooper Medical School of Rowan University Camden New Jersey USA

Background: Premature cervical softening and shortening may be considered an early mechanical failure that predispose to preterm birth. Purpose: This study aims to explore the applicability of an innovative cervical tactile ultrasound approach for predicting spontaneous preterm birth (sPTB). Materials and Methods: Eligible participants were women with low-risk singleton pregnancies in their second trimester, enrolled in this prospective observational study. A Cervix Monitor (CM) device was designed with a vaginal probe comprising four tactile sensors and a single ultrasound transducer operating at 5 MHz. The probe enabled the application of controllable pressure to the external cervical surface, facilitating the acquisition of stress-strain data from both anterior and posterior cervical sectors. Gestational age at delivery was recorded and compared against cervical elasticity. Results: CM examination data were analyzed for 127 women at 240/7 - 286/7 gestational weeks. sPTB was observed in 6.3% of the cases. The preterm group exhibited a lower average cervical stress-to-strain ratio (elasticity) of 0.70 ± 0.26 kPa/mm compared to the term group’s 1.63 ± 0.65 kPa/mm with a p-value of 1.1 × 10−4. Diagnostic accuracy for predicting spontaneous preterm birth based solely on cervical elasticity data was found to be 95.0% (95% CI, 88.5 - 100.0). Conclusion: These findings suggest that measuring cervical elasticity with the designed tactile ultrasound probe has the potential to predict spontaneous preterm birth in a cost-effective manner.

关键词： Cervical Elasticity Spontaneous Preterm Birth Tactile Ultrasound Probe

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nature:研究利用单细胞分析阐明癌症干细胞在脑癌中的关键角色

引用

现代生物医学进展 2017年第6期17卷 I0003-I0003页

作者： Itay Tirosh, Andrew S. Venteicher, Christine Hebert, Leah E. Escalante, Keren Yizhak, Jonathan M. Fisher, Christopher Rodman, Mariella G. Filbin, Cyril Neftel, Jackson Nyman, Benjamin Izar, Joshua M. Francis, Kenneth J. Livak, Dave Gennert, Rahul Satija, todd R. Golub, Miguel N. Rivera, Gad Getz, Orit Rozenblatt-rosen, Bradley E. Bernstein, Aviv Regev Mario L. Suv agrave Andrew S. Venteicher, Christine Hebert, Leah E. Escalante, Keren Yizhak, Mariella G. Filbin, Cyril Neftel, Niyati Desai, Christina C. Luo, Aanand A. Patel, Maristela L. Onozato, Nicolo Riggi, Ravindra Mylvaganam, A. John Iafrate, Matthew P. Frosch, Miguel N. Rivera, Gad Getz, Bradley E. Bernstein, David N. Louis Mario L. Suv agrave Andrew S. Venteicher, Anoop P. Patel, Brian V. Nahed, William T. Curry, Robert L. Martuza Daniel P. Cahill Christopher Mount Michelle Monje Mariella G. Filbin todd R. Golub Joshua M. Francis todd R. Golub Aviv Regev Broad Institute of Harvard and MIT Cambridge Massachusetts 02142 USA Department of Pathology and Center for Cancer Research Massachusetts General Hospital and Harvard Medical School Boston Massachusetts 02114 USA Department of Neurosurgery Massachusetts General Hospital and Harvard Medical School Boston Massachusetts 02114 USA Departments of Neurology Neurosurgery Pediatrics and Pathology Stanford University School of Medicine Stanford California 94305 USA Department of Pediatric Oncology Dana-Farber Cancer Institute and Children’s Hospital Cancer Center Boston Massachusetts 02215 USA Department of Medical Oncology Dana-Farber Cancer Institute Boston Massachusetts 02215 USA Howard Hughes Medical Institute Koch Institute Department of Biology MIT Cambridge Massachusetts 02139 USA

近日。来自麻省总医院、博德研究所及哈佛大学的研究人员通过联合研究，在单细胞水平上对脑瘤基因组进行了分析。他们发现。癌症干细胞或许能够诱发少突神经胶质瘤的发生，少突神经胶质瘤是一种缓慢发展但却非常难以治愈的脑癌，相关研... 详细信息

近日。来自麻省总医院、博德研究所及哈佛大学的研究人员通过联合研究，在单细胞水平上对脑瘤基因组进行了分析。他们发现。癌症干细胞或许能够诱发少突神经胶质瘤的发生，少突神经胶质瘤是一种缓慢发展但却非常难以治愈的脑癌，相关研究刊登于Nature杂志上。同时研究者还首次在人类脑瘤样本中鉴别出了癌症干细胞及其分化的后代细胞。

关键词：干细胞单细胞分析癌症脑瘤神经胶质瘤键角利用研究人员

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：