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Abstract #3512

Accounting for Pre-Capillary Signal in Arterial Spin Labelling Perfusion Measurements

Michael A. Chappell1, 2, Thomas W. Okell2, Bradley J. MacIntosh3, Peter Jezzard2, Stephen J. Payne1

1Institute of Biomedical Engineering, University of Oxford, Oxford, United Kingdom; 2FMRIB Centre, University of Oxford, Oxford, United Kingdom; 3Department of Medical Biophysics, University of Toronto, Toronto, Canada

There a number of sources of signal in Arterial Spin Labelling perfusion measurements. The major components that have been addressed to date are label undergoing exchange in the capillaries from which blood flow measurements can be obtained and that remaining in large arteries. However, it has been proposed that signal in impermeable small arterial vessels before the capillary space may also need to be accounted for. In this work the effects of pre-capillary signal on flow and blood volume estimation using multi-inversion time data and a model-based analysis strategy are examined.

Keywords

account accounted accounting adding adopt approaches arbitrary arises arising arriving arterial arteries artery assumed biomedical blood bolus brain capillaries capillary central cerebral closely collected compartment component components computationally confirm confounding consider crushed crushing derived deviation diffusion efficient either empirical employed equilibrium estimation examine except exchange exhibiting existing experiment explained extend extra fail fitting flow generally give giving gradients healthy hypothesis identified impermeable implications important include included includes inclusion input inversion investigate kinetic kingdom label larger latter leading length macro magnetization manner masks matrix mixed model models overall oxford paired parameterized perfusion permeability peter potentially presence prior priors probabilistic pulsed quantification rapid reaches readout reducing reduction related reliably remained removed representative reside respectively resting saturation scaled shape share shrinkage significance simpler since slices sought source space spends spin stages still subject subjects substantial substantially support suppressed suppression taking theory tips tissue tool transit typical unlike varied vascular vessels volume water written zero