NMR imaging of adhesive-bonded structures: the use of the T1 and T2 relaxation time informationNMR imagingnon-destructive evaluationpoly(vinyl acetate)emulsionsinhomogeneitiesNuclear magnetic resonance imaging (NMRI) is used to obtain cross-sectional images of three poly(vinyl alcohol) (PVOH) stabilized...
T1弛豫的发生是因为旋转核与周围环境(即晶格,lattice)之间有能量交换,引起up状态和down状态的原子核数量发生改变,重新恢复到未加B1的平衡状态时的数量分布,因此Mz会恢复到M0,而T1也称为自旋-晶格弛豫时间。 T2弛豫的发生也有一定程度的上述因素,但除此之外,也因为旋转核相互之间有能量交换,各个原子核旋转的相位变得...
T1ρ has a larger range and higher effect size than T2, 3.7 vs 3.0. Conclusion Our results suggest that both in vivo T1ρ and T2 relaxation times increase with the degree of cartilage degeneration. T1ρ relaxation time may be a more sensitive indicator for early cartilage degeneration than T...
T2 measures the transverse relaxation time and is used to assess the water and collagen content in the cartilage14, 15, 18, 19 while T1ρ, or relaxation in the rotating frame, probes the slow-motion interaction between the motion-restricted water molecules and large macromolecules and is used ...
T2andT1,andthecom— monclinicSEsequencesandLRfittingmethod,quantitativemapswereobtained,andtheleasi bilitvofpathwavwasde scribed.ResultsTwosetsofdatawerecollectedbytwinechosequenceandFSEsequence.Eac hsetcouldbesuccessfullv processedandspindensityp-map,relaxationtimeT2一 mapandT1mapcouldbeobtainedquantitatively....
Predicting T1 and T2How can you predict the T1 and T2 values of different tissues? At present there is no comprehensive theory that allows one to reliably predict the exact T1 and T2 values of different tissues. Sophisticated theories have been developed which adequately explain the relaxation ...
The T1 and T2 relaxation times of micelle encapsulated ESIONs and radiolabeled ESIONs were measured using a 1.41 T minispec mq 60 NMR Analyzer (Bruker, Germany) at 37 °C. Relaxivity values were calculated via linear least-squares fitting of 1/relaxation time (s− 1) vs. the iron conc...
Serial Changes of ADC, T1, and T2 Relaxation Times The ADCavg, ADChigh, T1, and T2 values of the cortex, OSOM, and ISOM at different time points after bilateral severe IRI and comparisons are summarized in Table1and illustrated in Fig.2. There were no significant differences of baseline ...
Quantitative theory for the longitudinal relaxation time of blood water[J]. Magn Reson Med, 2016, 76(1): 270-281. [6] YOSHIMARU E, TOTENHAGEN J, ALEXANDER G E, et al. 180 戚鸣,等 7.0T小动物磁共振成像系统几个常用线圈T1 mapping均匀性研究 Design, manufacture, and analysis of customized...
纵向弛豫是组织的固有特性,利用纵向弛豫时间定量成像(longitudinal relaxation time mapping,T1 mapping)技术能够进行非侵入性的可视化组织病理学改变(如水肿、纤维化等),可以直接定量得到组织的初始T1值、细胞外容积,其正逐渐应用于临床[1-2...