{"title":"1.26T2的过去、现在和未来","authors":"David Rovnyak","doi":"10.1002/cmr.a.21473","DOIUrl":null,"url":null,"abstract":"<p>This mini-review considers the scientific and historical development of the constant 1.26<i>T</i><sub>2</sub>, which represents the acquisition time for which the signal-to-noise ratio of a decaying exponential (with time constant <i>T</i><sub>2</sub>) is a maximum in the presence of thermal noise. While first reported in 1977, interest in this result greatly increased after about the year 2000, when it began to influence thinking in nonuniform sampling, sensitivity, and pulse sequence design. Overall, 1.26<i>T</i><sub>2</sub> has become a lens through which to view the evolution of NMR data acquisition and processing. An enduring lesson of the 1.26<i>T</i><sub>2</sub> story is the value of describing and analyzing the properties of magnetic resonance signals in the time domain prior to any further spectral analysis and processing, a concept which is at the core of many modern analytic techniques.</p>","PeriodicalId":55216,"journal":{"name":"Concepts in Magnetic Resonance Part A","volume":"47A 2","pages":""},"PeriodicalIF":0.4000,"publicationDate":"2019-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/cmr.a.21473","citationCount":"4","resultStr":"{\"title\":\"The past, present, and future of 1.26T2\",\"authors\":\"David Rovnyak\",\"doi\":\"10.1002/cmr.a.21473\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>This mini-review considers the scientific and historical development of the constant 1.26<i>T</i><sub>2</sub>, which represents the acquisition time for which the signal-to-noise ratio of a decaying exponential (with time constant <i>T</i><sub>2</sub>) is a maximum in the presence of thermal noise. While first reported in 1977, interest in this result greatly increased after about the year 2000, when it began to influence thinking in nonuniform sampling, sensitivity, and pulse sequence design. Overall, 1.26<i>T</i><sub>2</sub> has become a lens through which to view the evolution of NMR data acquisition and processing. An enduring lesson of the 1.26<i>T</i><sub>2</sub> story is the value of describing and analyzing the properties of magnetic resonance signals in the time domain prior to any further spectral analysis and processing, a concept which is at the core of many modern analytic techniques.</p>\",\"PeriodicalId\":55216,\"journal\":{\"name\":\"Concepts in Magnetic Resonance Part A\",\"volume\":\"47A 2\",\"pages\":\"\"},\"PeriodicalIF\":0.4000,\"publicationDate\":\"2019-04-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1002/cmr.a.21473\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Concepts in Magnetic Resonance Part A\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/cmr.a.21473\",\"RegionNum\":4,\"RegionCategory\":\"化学\",\"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 A","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/cmr.a.21473","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
This mini-review considers the scientific and historical development of the constant 1.26T2, which represents the acquisition time for which the signal-to-noise ratio of a decaying exponential (with time constant T2) is a maximum in the presence of thermal noise. While first reported in 1977, interest in this result greatly increased after about the year 2000, when it began to influence thinking in nonuniform sampling, sensitivity, and pulse sequence design. Overall, 1.26T2 has become a lens through which to view the evolution of NMR data acquisition and processing. An enduring lesson of the 1.26T2 story is the value of describing and analyzing the properties of magnetic resonance signals in the time domain prior to any further spectral analysis and processing, a concept which is at the core of many modern analytic techniques.
期刊介绍：
Concepts in Magnetic Resonance Part A brings together clinicians, chemists, and physicists involved in the application of 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 academic, governmental, and clinical communities, to disseminate the latest important experimental results from medical, non-medical, and analytical magnetic resonance methods, as well as related computational and theoretical advances.
Subject areas include (but are by no means limited to):
-Fundamental advances in the understanding of magnetic resonance
-Experimental results from magnetic resonance imaging (including MRI and its specialized applications)
-Experimental results from magnetic resonance spectroscopy (including NMR, EPR, and their specialized applications)
-Computational and theoretical support and prediction for experimental results
-Focused reviews providing commentary and discussion on recent results and developments in topical areas of investigation
-Reviews of magnetic resonance approaches with a tutorial or educational approach
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