Results 11 to 20 of about 4,103 (124)
Ultrasound in Obstetrics &Gynecology, Volume 59, Issue 4, Page 437-449, April 2022., 2022 ABSTRACT Objective To develop a standardized sonographic evaluation and reporting system for Cesarean scar pregnancy (CSP) in the first trimester, for use by both general gynecology and expert clinics. Methods A modified Delphi procedure was carried out, in which 28 international experts in obstetric and gynecological ultrasonography were invited to ...
I. P. M. Jordans +18 more
wiley +1 more source
First‐trimester ultrasound detection of fetal heart anomalies: systematic review and meta‐analysis
Ultrasound in Obstetrics &Gynecology, Volume 59, Issue 1, Page 11-25, January 2022., 2022 ABSTRACT Objectives To determine the diagnostic accuracy of ultrasound at 11–14 weeks' gestation in the detection of fetal cardiac abnormalities and to evaluate factors that impact the detection rate. Methods This was a systematic review of studies evaluating the diagnostic accuracy of ultrasound in the detection of fetal cardiac anomalies at 11–14 ...
J. N. Karim +26 more
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 58, Issue 2, Page 293-302, August 2021., 2021 ABSTRACT Objectives Preterm birth (PTB) accounts for two‐thirds of deaths of structurally normal babies and is associated with substantial lifetime healthcare costs. Prevention of PTB remains limited by the modest accuracy of prediction methods, namely transvaginal ultrasound (TVS) cervical length (CL) measurement and quantitative cervicovaginal fetal ...
D. O. C. Anumba +4 more
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 55, Issue 2, Page 264-268, February 2020., 2020 ABSTRACT Objective To investigate how many examinations it takes to be able to identify the pelvic parts of the ureters on transvaginal sonography (TVS). Methods This was a prospective study including consecutive women attending a gynecological outpatient clinic in a tertiary referral setting.
M. K. Aas‐Eng +5 more
wiley +1 more source
Developmental Medicine &Child Neurology, Volume 61, Issue 3, Page E1-E35, March 2019., 2019 目的 本国际临床指南由欧洲残疾儿童学会（the European Academy of Childhood Disability，EACD）牵头制定，旨在解决发育性协调障碍（developmental coordination disorder，DCD）的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题，通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础，以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类，最终转化为指南建议。并由国际 ...
Jing Hua +6 more
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 5, Page 624-632, May 2025.ABSTRACT Objectives Placental insufficiency contributes to many obstetric pathologies, but there is no bedside clinical tool to evaluate placental perfusion. We have developed a method to acquire multiple three‐dimensional (3D) power Doppler (PD) ultrasound (US) volumes of placental vasculature, with infrared camera tracking of the precise spatial ...
A. Xue +5 more
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 3, Page 303-310, March 2025.ABSTRACT Objective Globally, one in four pregnant women is classified as overweight or obese, based on their prepregnancy body mass index (BMI). Obese pregnant women are at increased risk of adverse pregnancy outcomes and long‐term cardiovascular disease that occurs earlier in life.
M. Charakida +6 more
wiley +1 more source
Gaoya dianqi, 2008 局部放电信号反映了断路器内部绝缘缺陷。为监测局部放电信号,笔者采用了超声法和超高频法对断路器进行试验,两种方法均检测到在线断路器内部的局部放电信号。由于超声波和电磁波特性上的差异,超声法能进行放电点的定位;超高频法能发现初期缺陷的低能放电,且抗干扰能力强。
胡涛, 刘海峰, 杜大全
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基于多频超声波技术和GWO-BP算法的变压器油电气性能检测方法研究
Gaoya dianqi, 2020 为了实现对变压器油电气性能快速准确地检测,提出了基于多频超声波（MFU）技术和灰狼优化BP神经网络（GWO-BP）的检测方法,利用不同频率超声波在变压器油中传播速度和衰减系数不同、对不同尺寸颗粒物检测效果不同的特点,综合了超声波在无损检测上的优势以及灰狼算法全局寻优能力强、预测精度高的优点。首先利用超声波在非均匀介质中的传播特性,准确地获取超声波在变压器油中的传播速度、衰减系数等特性参数;再利用灰狼算法对传统BP神经网络进行优化。然后利用灰狼优化的神经网络对样本进行训练 ...
王旭, 生西奎, 慕锟, 王昕
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Gaoya dianqi, 2014 论文论述了超声波检测在无损检测领域的应用特点,以及超声无损检测在多个领域的应用情况。通过对超声波检测的原理、波型、连续性和显示方式的分析和对比,重点论述了超声检测在电力系统绝缘子中的应用。介绍了超声绝缘子检测的机理、特点和适用范围,并对各个方法的优缺点进行了对比。在此基础上阐述了超声检测的发展趋势,对空气耦合超声和激光超声检测的方法、优缺点及应用前景进行了简单介绍,为后续的深入研究打下基础。
范兴明, 马世伟, 张鑫, 凌斯
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