Measurement of vascular water transport in human subjects using time-resolved pulsed arterial spin labelling.
Author
Summary, in English
Most approaches to arterial spin labelling (ASL) data analysis aim to provide a quantitative measure of the cerebral blood flow (CBF). This study, however, focuses on the measurement of the transfer time of blood water through the capillaries to the parenchyma (referred to as the capillary transfer time, CTT) as an alternative parameter to characterise the haemodynamics of the system. The method employed is based on a non-compartmental model, and no measurements need to be added to a common time-resolved ASL experiment. Brownian motion of labelled spins in a potential was described by a one-dimensional general Langevin equation as the starting point, and as a Fokker-Planck differential equation for the averaged distribution of labelled spins at the end point, which takes into account the effects of flow and dispersion of labelled water by the pseudorandom nature of the microvasculature and the transcapillary permeability. Multi-inversion time (multi-TI) ASL data were acquired in 14 healthy subjects on two occasions in a test-retest design, using a pulsed ASL sequence and three-dimensional gradient and spin echo (3D-GRASE) readout. Based on an error analysis to predict the size of a region of interest (ROI) required to obtain reasonably precise parameter estimates, data were analysed in two relatively large ROIs, i.e. the occipital lobe (OC) and the insular cortex (IC). The average values of CTT in OC were 260 ± 60 ms in the first experiment and 270 ± 60 ms in the second experiment. The corresponding IC values were 460 ± 130 ms and 420 ± 139 ms, respectively. Information related to the water transfer time may be important for diagnostics and follow-up of cerebral conditions or diseases characterised by a disrupted blood-brain barrier or disturbed capillary blood flow. Copyright © 2015 John Wiley & Sons, Ltd.
Department/s
- Lund University Bioimaging Center
- Medical Radiation Physics, Lund
- BioCARE: Biomarkers in Cancer Medicine improving Health Care, Education and Innovation
- MR Physics
- Department of Clinical Sciences, Malmö
- Mathematics (Faculty of Engineering)
- Medical Radiation Physics, Malmö
- Radiology Diagnostics, Malmö
- Anaesthesiology and Intensive Care Medicine
- Diagnostic Radiology, (Lund)
- MultiPark: Multidisciplinary research focused on Parkinson´s disease
Publishing year
2015
Language
English
Pages
1059-1068
Publication/Series
NMR in Biomedicine
Volume
28
Issue
8
Full text
Links
Document type
Journal article
Publisher
John Wiley & Sons Inc.
Topic
- Radiology, Nuclear Medicine and Medical Imaging
- Other Physics Topics
Status
Published
Project
- MRI brain perfusion quantification at 3 tesla using arterial spin labeling
Research group
- MR Physics
- Medical Radiation Physics, Malmö
- Radiology Diagnostics, Malmö
- Anaesthesiology and Intensive Care Medicine
ISBN/ISSN/Other
- ISSN: 0952-3480