Journal ArticleDOI
Diffusion-prepared stimulated-echo turbo spin echo (DPsti-TSE): An eddy current-insensitive sequence for three-dimensional high-resolution and undistorted diffusion-weighted imaging.
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TLDR
It is shown that DPsti‐TSE can serve as a robust 3D diffusion‐weighted sequence and is an attractive alternative to the traditional two‐dimensional DW‐EPI approaches.Abstract:
In this study, we present a new three-dimensional (3D), diffusion-prepared turbo spin echo sequence based on a stimulated-echo read-out (DPsti-TSE) enabling high-resolution and undistorted diffusion-weighted imaging (DWI). A dephasing gradient in the diffusion preparation module and rephasing gradients in the turbo spin echo module create stimulated echoes, which prevent signal loss caused by eddy currents. Near to perfect agreement of apparent diffusion coefficient (ADC) values between DPsti-TSE and diffusion-weighted echo planar imaging (DW-EPI) was demonstrated in both phantom transient signal experiments and phantom imaging experiments. High-resolution and undistorted DPsti-TSE was demonstrated in vivo in prostate and carotid vessel wall. 3D whole-prostate DWI was achieved with four b values in only 6 min. Undistorted ADC maps of the prostate peripheral zone were obtained at low and high imaging resolutions with no change in mean ADC values [(1.60 ± 0.10) × 10−3 versus (1.60 ± 0.02) × 10−3 mm2/s]. High-resolution 3D DWI of the carotid vessel wall was achieved in 12 min, with consistent ADC values [(1.40 ± 0.23) × 10−3 mm2/s] across different subjects, as well as slice locations through the imaging volume. This study shows that DPsti-TSE can serve as a robust 3D diffusion-weighted sequence and is an attractive alternative to the traditional two-dimensional DW-EPI approaches.read more
Citations
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Relationship between apparent diffusion coefficients at 3.0-T MR imaging and Gleason grade in peripheral zone prostate cancer
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Bram F. Coolen,Claudia Calcagno,Pim van Ooij,Zahi A. Fayad,Gustav J. Strijkers,Aart J. Nederveen +5 more
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Whole-Brain Functional and Diffusion Tensor MRI in Human Participants with Metallic Orthodontic Braces.
Xinyuan Miao,Xinyuan Miao,Yuankui Wu,Yuankui Wu,Yuankui Wu,Dapeng Liu,Dapeng Liu,Hangyi Jiang,David Woods,David Woods,Moshe T. Stern,Moshe T. Stern,Nicholas I.S. Blair,Nicholas I.S. Blair,Raag D. Airan,Chetan Bettegowda,Keri S. Rosch,Keri S. Rosch,Qin Qin,Peter C.M. van Zijl,Jay J. Pillai,Jun Hua,Jun Hua +22 more
TL;DR: T2- prepared functional MRI and diffusion-prepared diffusion tensor imaging can acquire functional and diffusion MRI, respectively, in healthy human participants wearing metallic dental braces with less susceptibility artifacts and geometric distortion than with conventional echo-planar imaging.
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Diffusion tensor imaging and arterial tissue: establishing the influence of arterial tissue microstructure on fractional anisotropy, mean diffusivity and tractography.
Brooke Tornifoglio,Alan J. Stone,Robert D. Johnston,Syed Salman Shahid,Christian Kerskens,Caitríona Lally,Caitríona Lally +6 more
TL;DR: FA, MD and tractography were found to be highly sensitive to changes in the microstructural composition of arterial tissue, specifically pointing to cell, not collagen, content as the dominant source of the measured anisotropy in the vessel wall.
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Near‐silent distortionless DWI using magnetization‐prepared RUFIS
Jianmin Yuan,Yuxin Hu,Anne Menini,Christopher M. Sandino,Jesse K. Sandberg,Vipul R. Sheth,Catherine J. Moran,Marcus T. Alley,Michael Lustig,Brian A. Hargreaves,Shreyas S. Vasanawala +10 more
TL;DR: To develop a near‐silent and distortionless DWI (sd‐DWI) sequence using magnetization‐prepared rotating ultrafast imaging sequence.
References
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Spin diffusion measurements : spin echoes in the presence of a time-dependent field gradient
E. O. Stejskal,J. E. Tanner +1 more
TL;DR: In this article, a derivation of the effect of a time-dependent magnetic field gradient on the spin-echo experiment, particularly in the presence of spin diffusion, is given.
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TL;DR: In this article, a spin echo method adapted to the measurement of long nuclear relaxation times (T2) in liquids is described, and the pulse sequence is identical to the one proposed by Carr and Purcell, but the rf of the successive pulses is coherent, and a phase shift of 90° is introduced in the first pulse.
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elastix : A Toolbox for Intensity-Based Medical Image Registration
TL;DR: The software consists of a collection of algorithms that are commonly used to solve medical image registration problems, and allows the user to quickly configure, test, and compare different registration methods for a specific application.
Journal ArticleDOI
Acute human stroke studied by whole brain echo planar diffusion‐weighted magnetic resonance imaging
TL;DR: Whole brain echo planar magnetic resonance imaging is used to identify and characterize diffusion abnormalities in acute cerebral ischemia and measures a unique physiological parameter that is sensitive to ischemic changes before conventional MRI, which has potential role in the quantitative study of human stroke pathophysiology and therapeutics.
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Artifacts and pitfalls in diffusion MRI.
TL;DR: In this article, specific problems that one may encounter when using MRI scanner gradient hardware for diffusion MRI, especially in terms of eddy currents and sensitivity to motion are reviewed.
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