Diffusion MRI with pulsed and free gradient waveforms: effects of restricted diffusion and exchange

A Chakwizira, CF Westin, J Brabec, S Lasič… - NMR in …, 2023 - Wiley Online Library
Monitoring time dependence with diffusion MRI yields observables sensitive to compartment
sizes (restricted diffusion) and membrane permeability (water exchange). However …

[HTML][HTML] Diffusion MRI with free gradient waveforms on a high-performance gradient system: Probing restriction and exchange in the human brain

A Chakwizira, A Zhu, T Foo, CF Westin… - NeuroImage, 2023 - Elsevier
The dependence of the diffusion MRI signal on the diffusion time carries signatures of
restricted diffusion and exchange. Here we seek to highlight these signatures in the human …

Equivalence of double and single wave vector diffusion contrast at low diffusion weighting

SN Jespersen - NMR in Biomedicine, 2012 - Wiley Online Library
Multiple pulsed field gradient diffusion sequences have received renewed interest in recent
years as a potentially new type of MRI contrast. This attention is largely a result of the ability …

[HTML][HTML] Cross-term-compensated gradient waveform design for tensor-valued diffusion MRI

F Szczepankiewicz, J Sjölund - Journal of magnetic resonance, 2021 - Elsevier
Diffusion MRI uses magnetic field gradients to sensitize the signal to the random motion of
spins. In addition to the prescribed gradient waveforms, background field gradients …

Effects of nongaussian diffusion on “isotropic diffusion” measurements: an ex-vivo microimaging and simulation study

SN Jespersen, JL Olesen, A Ianuş… - Journal of Magnetic …, 2019 - Elsevier
Designing novel diffusion-weighted pulse sequences to probe tissue microstructure beyond
the conventional Stejskal-Tanner family is currently of broad interest. One such technique …

Correction of gradient crosstalk and optimization of measurement parameters in diffusion MR imaging

M Eis, M Hoehnberlage - Journal of Magnetic Resonance, Series B, 1995 - Elsevier
Systematic errors in quantitative diffusion MRI are primarily due to the interference of the
imaging gradients with the gradients used for diffusion sensitization. To compensate for …

Optimizing gradient waveforms for microstructure sensitivity in diffusion-weighted MR

I Drobnjak, B Siow, DC Alexander - Journal of Magnetic Resonance, 2010 - Elsevier
Variations in gradient waveforms can provide different levels of sensitivity to microstructure
parameters in diffusion-weighted MR. We present a method that identifies gradient …

Numerical study of a macroscopic finite pulse model of the diffusion MRI signal

JR Li, HT Nguyen, D Van Nguyen, H Haddar… - Journal of Magnetic …, 2014 - Elsevier
Diffusion magnetic resonance imaging (dMRI) is an imaging modality that probes the
diffusion characteristics of a sample via the application of magnetic field gradient pulses …

Unraveling diffusion constants in biological tissue by combining Carr‐Purcell‐Meiboom‐Gill imaging and pulsed field gradient NMR

D van Dusschoten, CTW Moonen… - Magnetic resonance …, 1996 - Wiley Online Library
A diffusion‐weighted multi‐spin‐echo pulse sequence is presented, which allows for
simultaneous measurement of T2, the fractional amplitude, and the diffusion constant of …

Time‐dependent influence of cell membrane permeability on MR diffusion measurements

H Li, X Jiang, J Xie, JO McIntyre… - Magnetic resonance in …, 2016 - Wiley Online Library
Purpose To investigate the influence of cell membrane permeability on diffusion
measurements over a broad range of diffusion times. Methods Human myelogenous …