scholarly journals Transverse relaxation time constants of the five major metabolites in human brain measured in vivo using LASER and PRESS at 3 T

2017 ◽  
Vol 79 (3) ◽  
pp. 1260-1265 ◽  
Author(s):  
Dinesh K. Deelchand ◽  
Edward J. Auerbach ◽  
Naoharu Kobayashi ◽  
Małgorzata Marjańska
Keyword(s):  
Relaxation Time ◽  
Human Brain ◽  
Transverse Relaxation Time ◽  
Transverse Relaxation ◽  
Time Constants ◽  
Relaxation Time Constants

In vivo estimation of transverse relaxation time constant (T2 ) of 17 human brain metabolites at 3T

2018 ◽  
Vol 80 (2) ◽  
pp. 452-461 ◽  
Author(s):  
Patrik O. Wyss ◽  
Claudio Bianchini ◽  
Milan Scheidegger ◽  
Ioannis A. Giapitzakis ◽  
Andreas Hock ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Human Brain ◽  
Time Constant ◽  
Transverse Relaxation Time ◽  
Brain Metabolites ◽  
Transverse Relaxation ◽  
Relaxation Time Constant

scholarly journals Determining the in vivo transverse relaxation time of GABA in the human brain at 7T

2012 ◽  
Vol 38 (5) ◽  
pp. 1224-1229 ◽  
Author(s):  
Jarunee Intrapiromkul ◽  
He Zhu ◽  
Ying Cheng ◽  
Peter B. Barker ◽  
Richard A.E. Edden
Keyword(s):  
Relaxation Time ◽  
Human Brain ◽  
Transverse Relaxation Time ◽  
Transverse Relaxation

scholarly journals Virtual Breast Quasi-static Elastography (VBQE)

2016 ◽  
Vol 39 (2) ◽  
pp. 108-125 ◽  
Author(s):  
David Rosen ◽  
Yu Wang ◽  
Jingfeng Jiang
Keyword(s):  
Relaxation Time ◽  
Three Dimensional ◽  
Primary Objective ◽  
Transfer Efficiency ◽  
External Compression ◽  
Time Resolved ◽  
Time Constants ◽  
Strain Measurements ◽  
Relaxation Time Constants

Viscoelasticity Imaging (VEI) has been proposed to measure relaxation time constants for characterization of in vivo breast lesions. In this technique, an external compression force on the tissue being imaged is maintained for a fixed period of time to induce strain creep. A sequence of ultrasound echo signals is then utilized to generate time-resolved strain measurements. Relaxation time constants can be obtained by fitting local time-resolved strain measurements to a viscoelastic tissue model (e.g., a modified Kevin-Voigt model). In this study, our primary objective is to quantitatively evaluate the contrast transfer efficiency (CTE) of VEI, which contains useful information regarding image interpretations. Using an open-source simulator for virtual breast quasi-static elastography (VBQE), we conducted a case study of contrast transfer efficiency of VEI. In multiple three-dimensional (3D) numerical breast phantoms containing various degrees of heterogeneity, finite element (FE) simulations in conjunction with quasi-linear viscoelastic constitutive tissue models were performed to mimic data acquisition of VEI under freehand scanning. Our results suggested that there were losses in CTE, and the losses could be as high as −18 dB. FE results also qualitatively corroborated clinical observations, for example, artifacts around tissue interfaces.

scholarly journals In vivo measurement of transverse relaxation time in the mouse brain at 17.6 T

2012 ◽  
Vol 70 (4) ◽  
pp. 985-993 ◽  
Author(s):  
Firat Kara ◽  
Fu Chen ◽  
Itamar Ronen ◽  
Huub J. M. de Groot ◽  
Jörg Matysik ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Mouse Brain ◽  
Transverse Relaxation Time ◽  
Transverse Relaxation ◽  
In Vivo Measurement
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