scholarly journals Accurate T1mapping of short T2tissues using a three-dimensional ultrashort echo time cones actual flip angle imaging-variable repetition time (3D UTE-Cones AFI-VTR) method

2018 ◽  
Vol 80 (2) ◽  
pp. 598-608 ◽  
Author(s):  
Ya-Jun Ma ◽  
Xing Lu ◽  
Michael Carl ◽  
Yanchun Zhu ◽  
Nikolaus M. Szeverenyi ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Flip Angle ◽  
Ultrashort Echo Time ◽  
Repetition Time ◽  
Echo Time

Three-dimensional ultrashort echo time cones (3D UTE-Cones) magnetic resonance imaging of entheses and tendons

2018 ◽  
Vol 49 ◽  
pp. 4-9 ◽  
Author(s):  
Bimin Chen ◽  
Yinghua Zhao ◽  
Xin Cheng ◽  
Yajun Ma ◽  
Eric Y. Chang ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Three Dimensional ◽  
Resonance Imaging ◽  
Ultrashort Echo Time ◽  
Echo Time

Three-Dimensional Ultrashort Echo Time Imaging of Solid Polymers on a 3-Tesla Whole-Body MRI Scanner

2008 ◽  
Vol 43 (11) ◽  
pp. 802-808 ◽  
Author(s):  
Fabian Springer ◽  
Petros Martirosian ◽  
Nina F. Schwenzer ◽  
Michael Szimtenings ◽  
Peter Kreisler ◽  
...  
Keyword(s):  
Three Dimensional ◽  
3 Tesla ◽  
Whole Body ◽  
Ultrashort Echo Time ◽  
Whole Body Mri ◽  
Solid Polymers ◽  
Echo Time

Exponential subtraction in 3D ultrashort echo time imaging to visualize short T2 tissues in tibia

2019 ◽  
Vol 61 (6) ◽  
pp. 760-767
Author(s):  
Sha Li ◽  
Xinrui Huang ◽  
Guozhen Li ◽  
Yibao Zhang ◽  
Zhaotong Li ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Three Dimensional ◽  
Regions Of Interest ◽  
Observer Agreement ◽  
Exponential Factor ◽  
Ultrashort Echo Time ◽  
Short T2 ◽  
Exponential Factors ◽  
Echo Time ◽  
Dual Echo

Background Short T2 tissues can be directly visualized by dual-echo ultrashort echo time imaging with weighted subtraction. As a type of post-processing method, exponential subtraction of ultrashort echo time images with an optimal exponential factor is expected to provide improved positive short T2 contrast. Purpose To test the feasibility and effectiveness of exponential subtraction in three-dimensional ultrashort echo time imaging and to determine the optimal exponential factor. Material and Methods A dual-echo three-dimensional ultrashort echo time sequence was implemented on a 3-T MRI system. Exponential subtraction was performed on dual three-dimensional ultrashort echo time images of the tibia of seven healthy volunteers with exponential factors in the range of 1.00–3.00 in increments of 0.01. The regions of interest, including cortical bone, marrow, and muscle, were depicted on subtracted images of different exponential factors. Contrast-to-noise ratio values were calculated from these regions of interest and then used to assess the optimal exponential factor. To determine intra-observer agreement regarding region of interest selection, paired intra-observer measurements of regions of interest in all direct subtraction images were conducted with a one-week interval and the paired measurements were assessed using Bland–Altman analysis and paired-samples t-test. Results Cortical bone can be better visualized by using exponential subtraction in three-dimensional ultrashort echo time imaging; the suggested optimal exponential factor is 1.99–2.03 in the tibia. Paired measurements showed excellent intra-observer agreement. Conclusion It is feasible to visualize cortical bone of the tibia using exponential subtraction in three-dimensional ultrashort echo time imaging. Compared with weighted subtraction images, exponential subtraction images with an optimal exponential factor provide enhanced visualization of short T2 tissues.

scholarly journals Pulmonary Embolism Detection with Three-dimensional Ultrashort Echo Time MR Imaging: Experimental Study in Canines

Radiology ◽  
2016 ◽  
Vol 278 (2) ◽  
pp. 413-421 ◽  
Author(s):  
Peter Bannas ◽  
Laura C. Bell ◽  
Kevin M. Johnson ◽  
Mark L. Schiebler ◽  
Christopher J. François ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pulmonary Embolism ◽  
Mr Imaging ◽  
Three Dimensional ◽  
Ultrashort Echo Time ◽  
Echo Time

Variable flip angle 3D ultrashort echo time (UTE) T1mapping of mouse lung: A repeatability assessment

2018 ◽  
Vol 48 (3) ◽  
pp. 846-852 ◽  
Author(s):  
Daniel F. Alamidi ◽  
Amir Smailagic ◽  
Abdel W. Bidar ◽  
Nicole S. Parker ◽  
Marita Olsson ◽  
...  
Keyword(s):  
Flip Angle ◽  
Mouse Lung ◽  
Variable Flip Angle ◽  
Ultrashort Echo Time ◽  
Echo Time
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