检索结果-南通市图书馆

Automatic Optimization of Chirp Setting Parameters in Medical Ultrasound Contrast Imaging

Journal of Life Sciences 2013年第6期7卷 592-598页

作者： amira zaylaa Sebastien Menigot Jamal Charara Jean-Marc Girault Department of Medical Biophysics and Imaging Universite Franqois Rabelais de Tours UMR-S930 and ERL3106 B.P 3223Tours France INSERM U930 Tours France Department of Physics and Electronics Lebanese University Hadath Campus B.P. 5 Beirut Lebanon IUT Ville d'Avray Universite Paris Ouest Nanterre La Defense B.P. 105 Avray France

Medical ultrasound contrast imaging is a powerful modality undergoing successive developments in the last decade to date. Lately, pulse inversion has been used in both ultrasound tissue harmonic and contrast imaging. However, there was a tradeoff between resolution and penetration. Chirp excitations partially solved the tradeoff, but the chirp setting parameters were not optimized. The present work proposes for the first time combining chirp inversion with ultrasound contrast imaging, with the motivation to improve the contrast, by automatically optimizing the setting parameters of chirp excitation, it is thus an optimal command problem. Linear chirps, 5 μm diameter microbubbles and gradient ascent algorithm were simulated to optimize the chirp setting parameters. Simulations exhibited a gain of 5 dB by automatic optimization of chirp inversion relative to pulse inversion. The automatic optimization process was quite fast. Combining chirp inversion with ultrasound contrast imaging led to a maximum backscattered power permitting high contrast outcomes and optimum parameters.

关键词：线性啁啾医学超声自动优化造影设置成像模拟优化高对比度

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

Dedicated Magnetic Resonance Imaging Sequences:Contribution in the Diagnosis of Focal Epilepsy in the Lebanese Population

引用

Journal of Health Science 2018年第6期6卷 439-445页

作者： Najo A.Jomaa Marwan Haddad Grace Y.Adwane amira J.zaylaa Abdallah Rahbani Faculty of Medical Sciences Lebanese UniversityHadath Baabda 1003Lebanon Imaging Department Mount Lebanon HospitalHazmieh 1107Lebanon Epilepsy monitoring unit Department of NeurologyLebanese Geitaoui University HospitalAchrafieh Beirut 1100Lebanon Doctoral School of Science and Technology Lebanese UniversityHadath Baabda 1003Lebanon

There have been many advances in the diagnosis and management of focal epilepsies particularly with neuroimaging techniques and magnetic resonance imaging(MRI).Special MRI sequences can be employed to localize and resect the epileptogenic lesions responsible for focal *** study aims to show the benefit of dedicated epilepsy MRI sequences in the diagnosis of focal epilepsies.A general electric 1.5 Tesla MRI machine was used with standard and special ***,a Nihon Kohden electroencephalography(EEG)machine was *** is a prospective observational study that included 51 patients with focal epilepsies who had an initial negative brain *** underwent epilepsy MRI sequences along with a prolonged video EEG monitoring to localize the lesion,and then results were analyzed statistically using SPSS 22 *** majority of patients were males(62.75%)with a mean age of 30 *** grand majority of patients(74.5%,p value of 0.001)had their lesion localized by the epilepsy *** most commonly found pathology was mesial temporal sclerosis.A significant number of patients(23.5%)were sent for an epilepsy surgery(p value 0.002).This study shows the significant impact of dedicated epilepsy MRI sequences on the diagnosis and management of focal epilepsy in the Lebanese population.

关键词： Epilepsy magnetic resonance imaging dedicated sequences focal epileptogenic lesions hippocampal sclerosis cortical dysplasia.

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

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

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：