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Abstract #0590

Arterial spin labelling-based evaluation of cerebrovascular reserve impairment using a mathematical convolution model

Markus Fahlström1, Joao Sousa1, Teodor Svedung Wettervik1, Johan Berglund1, Per Enblad1, Anders Lewén1, and Johan Wikström1
1Uppsala University, Uppsala, Sweden

Synopsis

Keywords: Biology, Models, Methods, Modelling, Cerebrovascular reserve

Motivation: Modelled CVR response to acetazolamide in affected regions resembles the effects of dispersion compared to unaffected regions and thus can be mathematically described as a convolution with a flow dampening function (FDF).

Goal(s): To formalise the derivation of the FDF and to assess clinical potential.

Approach: Formalisation of the FDF was based on the convolution theorem. Analysis of simulation data and in-vivo ASL-based measurements were performed. Absolute area under the FDF was calculated.

Results: The shape of the FDF followed a predictable pattern. Correlation analysis showed moderate to high correlations between absolute area and CVR and time to maximum blood flow augmentation, respectively.

Impact: Flow dampening functions in conjunction with modelling of the cerebrovascular response after acetazolamide injection may be used as a clinical surrogate in patients with moyamoya disease. Further studies are warranted analysing longitudinal datasets and normal material.

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