{"title":"自旋密度，T1, T2, T2*弛豫和Bloch方程","authors":"Hongyu An, Weili Lin","doi":"10.1002/0471142719.mib0301s00","DOIUrl":null,"url":null,"abstract":"<p>This unit discusses the four primary sources of signal variation in a standard MRI sequence. <i>T</i><sub>1</sub> and <i>T</i><sub>2</sub>/<i>T</i><sub>2</sub>* relaxation reveal the time dependence of the longitudinal and transverse component of the magnetization, respectively. When imaging is performed, the effective spin density is considered as the number of spins per voxel. The variation of signal with voxel size is discussed. Modification of Bloch equations that govern the motion of the magnetization is discussed for all four cases.</p>","PeriodicalId":100347,"journal":{"name":"Current Protocols in Magnetic Resonance Imaging","volume":"00 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2001-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/0471142719.mib0301s00","citationCount":"1","resultStr":"{\"title\":\"Spin Density, T1, T2, T2* Relaxation and Bloch Equations\",\"authors\":\"Hongyu An, Weili Lin\",\"doi\":\"10.1002/0471142719.mib0301s00\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>This unit discusses the four primary sources of signal variation in a standard MRI sequence. <i>T</i><sub>1</sub> and <i>T</i><sub>2</sub>/<i>T</i><sub>2</sub>* relaxation reveal the time dependence of the longitudinal and transverse component of the magnetization, respectively. When imaging is performed, the effective spin density is considered as the number of spins per voxel. The variation of signal with voxel size is discussed. Modification of Bloch equations that govern the motion of the magnetization is discussed for all four cases.</p>\",\"PeriodicalId\":100347,\"journal\":{\"name\":\"Current Protocols in Magnetic Resonance Imaging\",\"volume\":\"00 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2001-05-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1002/0471142719.mib0301s00\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Current Protocols in Magnetic Resonance Imaging\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/0471142719.mib0301s00\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Current Protocols in Magnetic Resonance Imaging","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/0471142719.mib0301s00","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Spin Density, T1, T2, T2* Relaxation and Bloch Equations
This unit discusses the four primary sources of signal variation in a standard MRI sequence. T1 and T2/T2* relaxation reveal the time dependence of the longitudinal and transverse component of the magnetization, respectively. When imaging is performed, the effective spin density is considered as the number of spins per voxel. The variation of signal with voxel size is discussed. Modification of Bloch equations that govern the motion of the magnetization is discussed for all four cases.
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