用于反射谐振器的250 MHz无源q调制器

IF 0.9 4区医学 Q4 CHEMISTRY, PHYSICAL

Concepts in Magnetic Resonance Part B-Magnetic Resonance Engineering Pub Date : 2017-09-28 DOI:10.1002/cmr.b.21356

Boris Epel, Subramanian V. Sundramoorthy, Howard J. Halpern

{"title":"用于反射谐振器的250 MHz无源q调制器","authors":"Boris Epel, Subramanian V. Sundramoorthy, Howard J. Halpern","doi":"10.1002/cmr.b.21356","DOIUrl":null,"url":null,"abstract":"<p>A simple scheme for dynamically switching the quality factor, Q, of a loop-gap resonator (LGR); working at 250 MHz is presented. The addition of this Q-modulator resulted in 30% improvement in electron paramagnetic resonance imager signal-to-noise ratio. During pulse excitation, this scheme lowered the Q, while higher Q was obtained during signal detection. These conditions favored the image acquisition. The Q-modulator is passive; the transition between different states was actuated by the radio frequency power itself.</p>","PeriodicalId":50623,"journal":{"name":"Concepts in Magnetic Resonance Part B-Magnetic Resonance Engineering","volume":"47B 2","pages":""},"PeriodicalIF":0.9000,"publicationDate":"2017-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/cmr.b.21356","citationCount":"1","resultStr":"{\"title\":\"250 MHz passive Q-modulator for reflection resonators\",\"authors\":\"Boris Epel, Subramanian V. Sundramoorthy, Howard J. Halpern\",\"doi\":\"10.1002/cmr.b.21356\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>A simple scheme for dynamically switching the quality factor, Q, of a loop-gap resonator (LGR); working at 250 MHz is presented. The addition of this Q-modulator resulted in 30% improvement in electron paramagnetic resonance imager signal-to-noise ratio. During pulse excitation, this scheme lowered the Q, while higher Q was obtained during signal detection. These conditions favored the image acquisition. The Q-modulator is passive; the transition between different states was actuated by the radio frequency power itself.</p>\",\"PeriodicalId\":50623,\"journal\":{\"name\":\"Concepts in Magnetic Resonance Part B-Magnetic Resonance Engineering\",\"volume\":\"47B 2\",\"pages\":\"\"},\"PeriodicalIF\":0.9000,\"publicationDate\":\"2017-09-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1002/cmr.b.21356\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Concepts in Magnetic Resonance Part B-Magnetic Resonance Engineering\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/cmr.b.21356\",\"RegionNum\":4,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Concepts in Magnetic Resonance Part B-Magnetic Resonance Engineering","FirstCategoryId":"3","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/cmr.b.21356","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 1

摘要

动态切换环隙谐振器(LGR)品质因子Q的一种简单方案工作频率为250 MHz。该q调制器的加入使电子顺磁共振成像仪信噪比提高了30%。该方案在脉冲激励过程中降低了Q值，而在信号检测过程中获得了更高的Q值。这些条件有利于图像采集。q调制器是无源的;不同状态之间的转换是由射频电源本身驱动的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

250 MHz passive Q-modulator for reflection resonators

查看原文本刊更多论文

250 MHz passive Q-modulator for reflection resonators

A simple scheme for dynamically switching the quality factor, Q, of a loop-gap resonator (LGR); working at 250 MHz is presented. The addition of this Q-modulator resulted in 30% improvement in electron paramagnetic resonance imager signal-to-noise ratio. During pulse excitation, this scheme lowered the Q, while higher Q was obtained during signal detection. These conditions favored the image acquisition. The Q-modulator is passive; the transition between different states was actuated by the radio frequency power itself.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

Concepts in Magnetic Resonance Part B-Magnetic Resonance Engineering 物理-光谱学

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Concepts in Magnetic Resonance Part B brings together engineers and physicists involved in the design and development of hardware and software employed in magnetic resonance techniques. The journal welcomes contributions predominantly from the fields of magnetic resonance imaging (MRI), nuclear magnetic resonance (NMR), and electron paramagnetic resonance (EPR), but also encourages submissions relating to less common magnetic resonance imaging and analytical methods. Contributors come from both academia and industry, to report the latest advancements in the development of instrumentation and computer programming to underpin medical, non-medical, and analytical magnetic resonance techniques.