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On the sampling strategies and models for measuring diffusion exchange with a double diffusion encoding sequence

Magnetic Resonance Letters 2023年第3期3卷 232-247,I0003页

作者： Alfredo Ordinola Shan Cai Peter Lundberg Ruiliang Bai Evren Ozarslan Department of Biomedical Engineering(IMT) Link oping UniversityLink opingS-58185Sweden Department of Radiation Physics Department of HealthMedicine and Caring Sciences(HMV)Link oping UniversityLink opingS-58183Sweden Center for Medical Image Science and Visualization(CMIV) Link oping UniversityLink opingS-58185Sweden School of Medicine Zhejiang University866 Yuhangtang RdHangzhou310058China

Water exchange between the different compartments of a heterogeneous specimen can be characterized via diffusion magnetic resonance imaging(dMRI).Many analysis frameworks using dMRI data have been proposed to describe exchange,often using a double diffusion encoding(DDE)stimulated echo *** such as diffusion exchange weighted imaging(DEWI)and the filter exchange and rapid exchange models,use a specific subset of the full space DDE *** this work,a general representation of the DDE signal was employed with different sampling schemes(namely constant b1,diagonal and anti-diagonal)from the data reduction models to estimate exchange.A near-uniform sampling scheme was proposed and compared with the other sampling *** filter exchange and rapid exchange models were also applied to estimate exchange with their own subsampling *** subsampling schemes and models were compared on both simulated data and experimental data acquired with a benchtop MR *** synthetic data,the diagonal and near-uniform sampling schemes performed the best due to the consistency of their estimates with the ground *** experimental data,the shifted diagonal and near-uniform sampling schemes outperformed the others,yielding the most consistent estimates with the full space *** results suggest the feasibility of measuring exchange using a general representation of the DDE signal along with variable sampling *** future studies,algorithms could be further developed for the optimization of sampling schemes,as well as incorporating additional properties,such as geometry and diffusion anisotropy,into exchange frameworks.

关键词： Diffusion MRI Water exchange sampling schemes Double diffusion encoding

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The Theory of Composite and Switching Characteristics under sampling Scheme-I

引用

Systems Science and Systems Engineering 1993年第3期3卷 243-250页

作者： LIU Shuchi XU HongmeiMathematics Research Office, Tianjin Textile Engineering College, Tianjin 300160, P.R. China

Using the new theoretical method managed by theory concerned with recurrent state and transient state obtains complete composite and switching characteristics of various kinds of sampling schemes, especially ISO 2859.

关键词： sampling schemes composite characteristics switching characteristics.

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