[HTML][HTML] Gradient waveform design for tensor-valued encoding in diffusion MRI

F Szczepankiewicz, CF Westin, M Nilsson - Journal of Neuroscience …, 2021 - Elsevier
Diffusion encoding along multiple spatial directions per signal acquisition can be described
in terms of a b-tensor. The benefit of tensor-valued diffusion encoding is that it unlocks …

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 …

Motion‐compensated gradient waveforms for tensor‐valued diffusion encoding by constrained numerical optimization

F Szczepankiewicz, J Sjölund… - Magnetic resonance …, 2021 - Wiley Online Library
Purpose Diffusion‐weighted MRI is sensitive to incoherent tissue motion, which may
confound the measured signal and subsequent analysis. We propose a “motion …

Time dependence in diffusion MRI predicts tissue outcome in ischemic stroke patients

B Lampinen, J Lätt, J Wasselius… - Magnetic resonance …, 2021 - Wiley Online Library
Purpose Reperfusion therapy enables effective treatment of ischemic stroke presenting
within 4–6 hours. However, tissue progression from ischemia to infarction is variable, and …

Probing restricted diffusion and exchange using free gradient waveforms: validation by numerical simulations

A Chakwizira, CF Westin, J Brabec, S Lasič… - arXiv preprint arXiv …, 2021 - arxiv.org
Monitoring time-dependence with diffusion MRI yields observables sensitive to compartment
sizes (restricted diffusion) and membrane permeability (water exchange). However …

Characterisation of restricted diffusion and exchange using the velocity autocorrelation function

A Chakwizira, S Lasič, A Reymbaut… - Proceedings of the …, 2022 - archive.ismrm.org
Temporal velocity correlations of diffusing particles carry information about the structure of
the diffusion environment. Studying high-order velocity autocorrelation functions can aid in …

Probing restricted diffusion and water exchange with free gradient waveforms: Addressing the need for a compartment model

A Chakwizira, F Szczepankiewicz, L Knutsson… - archive.ismrm.org
Diffusion MRI can be used to probe restricted diffusion (compartment size) and water
exchange (membrane permeability), but their effects on the signal are entangled. This …

Cumulant expansions for measuring restricted diffusion and water exchange

A Chakwizira, F Szczepankiewicz, L Knutsson… - archive.ismrm.org
Cell sizes and membrane permeability can be inferred by probing time–dependent diffusion
due to restricted diffusion and water exchange. However, restriction and exchange have …

Mapping water exchange in the human brain using diffusion MRI with free waveform encoding

A Chakwizira, F Szczepankiewicz, CF Westin, G Vis… - archive.ismrm.org
Temporal velocity correlations of diffusing particles carry information about the structure of
the diffusion environment. Studying high-order velocity autocorrelation functions can aid in …

[PDF][PDF] Unified theory and experimental approach for measuring restricted diffusion and water exchange

A Chakwizira - 2020 - lup.lub.lu.se
Fifteen million people lose their lives to stroke and cancer every year. This amounts to one in
every four deaths worldwide, making these among the deadliest diseases affecting …