Publications [#132760] of G. Allan Johnson

Papers Published

1. JH Maki, JR MacFall, GA Johnson, The use of gradient flow compensation to separate diffusion and microcirculatory flow in MRI., Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine, UNITED STATES, vol. 17 no. 1 (January, 1991), pp. 95-107, ISSN 0740-3194
   (last updated on 2005/08/03)

   Abstract:
   This paper describes a new MR imaging technique termed Modified Stejskal Tanner versus Flow Compensation (MST/FC) for the separation of diffusion and microcirculatory flow. The theory behind the sequence is explained, along with a five-component model of microcirculation applicable to any "perfusion" imaging technique. Phantom data is presented showing that (1) diffusion effects can be matched between MST and FC (suggesting the possibility of flow-compensated diffusion imaging), and (2) the technique is a quantitative method of separating diffusion and slow (less than 0.25 mm/s) tortuous flow through a Sephadex column. Furthermore, animal images show the technique to be feasible and quantitative in measuring rat brain microcirculation under normal, vasodilated (hypercarbia), and no-flow (post mortem) conditions.

   Keywords:
   Acetone • Animals • Brain • Dextrans • Diffusion • Edetic Acid • Female • Gadolinium • Gels • Image Enhancement • Magnetic Resonance Imaging • Microcirculation • Models, Biological • Models, Structural • Rats • Rats, Inbred F344 • Reproducibility of Results • Rheology • Water • blood supply • chemistry • instrumentation • methods* • physiology*