Mapping the intracellular fraction of water by varying the gradient pulse length in q-space diffusion MRI
Författare
Summary, in English
Finite gradient pulse lengths are traditionally considered a nuisance in q-space diffusion NMR and MRI, since the simple Fourier relation between the acquired signal and the displacement probability is invalidated. Increasing the value of the pulse length leads to an apparently smaller value of the estimated compartment size. We propose that q-space data at different gradient pulse lengths, but with the same effective diffusion time, can be used to identify and quantify components with free or restricted diffusion from multi-exponential echo decay curves obtained on cellular systems. The method is demonstrated with experiments on excised human brain white matter and a series of model systems with well-defined free, restricted, and combined free and restricted diffusion behavior. Time-resolved diffusion MRI experiments are used to map the spatial distribution of the intracellular fraction in a yeast cell suspension during sedimentation, and observe the disappearance of this fraction after a heat treatment. (c) 2006 Elsevier Inc. All rights reserved.
Avdelning/ar
Publiceringsår
2006
Språk
Engelska
Sidor
280-285
Publikation/Tidskrift/Serie
Journal of Magnetic Resonance
Volym
180
Issue
2
Dokumenttyp
Artikel i tidskrift
Förlag
Academic Press
Ämne
- Radiology, Nuclear Medicine and Medical Imaging
- Cancer and Oncology
Nyckelord
- imaging
- tissue
- PGSE
- pulsed field gradient
- SGP
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1096-0856