The T1 relaxation times are between 0.83 and 1.04 s and the T2 relaxation times between 15 and 26 ms for the emulsions. The relaxation information is used to compute a proton spin density image. Optimum pulse sequence parameters are determined to detect and to create a maximum intensity ...
NMR MRI T1/2 relaxation spin echo 2.4万播放 Part 1 - NMR Basics 42:44 Part 2 - The Spin Echo 39:26 Part 3 - The Fourier Transform and K-Space 58:55 Part 4 - The Gradient Recalled Echo (GRE) 57:33 静息态功能性磁振影像分析操作 Resting-State fMRI analysis in anction 1.8万播放 ...
spin-spin relaxation/ DIFN pulse sequenceoptimised time intervalsnuclear magnetic resonance imagingNMR signalT 1-filtersT 1/T 2-contrast enhancingsignal componentsradiofrequency field inhomogeneityImproved pulse sequences DIFN (abbreviation of the words: DIFferentiation by N pulses), 90° τ 1 180° ...
Water protons T1 and T2 relaxation times in samples of whole blood, obtained from healthy people and from patients affected by Macrocytic Anemia on one side and Lymphatic and Myeloid Leukemia on the other, have been measured with the FT NMR technique at 80 Mhz and at 25 掳C. No significant...
T2 relaxation accompanies all T1 relaxation processes. Additionally, T2 occurs in a secular fashion (without T1 or energy exchange) when molecular motion slows to well below the Larmor frequency. Hence solids, macromolecules, and bound water molecules rotate slowly and have short T2 values. T2 ...
NMR MRI T1/2 relaxation spin echo 2.4万播放 Part 1 - NMR Basics 42:44 Part 2 - The Spin Echo 39:26 Part 3 - The Fourier Transform and K-Space 58:55 Part 4 - The Gradient Recalled Echo (GRE) 57:33 静息态功能性磁振影像分析操作 Resting-State fMRI analysis in anction 1.8万播放 ...
如果沿x方向加一功率很强的射频脉冲，M0将不再保持静止，它将绕着x轴进行转动，这种转动在NMR中称为...
6) 结合定量技术,T1-T2二维谱图可实现不同含氢组分的定量测量功能。 7) T1-T2二维谱图分析水化白水泥模型如图3所示。 来源说明:An NMR Relaxation Method of Characterizing Hydrogen-Bearing Crystalline Solid Phases in Hydrated Cement Paste,IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 71, 2022...
NMR relaxation times in the human brain at 3.0 Tesla. JMRI (1999); 9:531-538. Acknowledgement: The authors would like to acknowledge funding from Siemens Healthcare and NIH grants NIH 1R01EB016728-01A1 and NIH 5R01EB017219-02 Proc. Intl. Soc. Mag. Reson. Med. 23 (2015) 0121. ...
我们知道T1弛豫是纵向弛豫(longitudinal relaxation),又叫做自旋-晶格弛豫(spin-lattice relaxation),是指吸收了能量跃迁至高能级的氢质子将能量释放到其周围晶格中,恢复到低能级稳态的过程。T2弛豫是横向弛豫(transverse relaxation),又叫做自旋-自旋弛豫(spin-spin relaxation...