title: A controllably anisotropic conductivity or diffusion phantom constructed from isotropic layers.
abstract: Phantoms with controllable and well-defined anisotropy are needed to test methods for imaging electrical anisotropy. We developed and tested a phantom that had properties similar to a homogeneous anisotropic conductive medium. The phantom was constructed with alternate slices of isotropic gel having different conductivities. The degree of anisotropy in the phantom could be varied easily by changing the relative conductivity of the two gels. We tested the stability of several phantoms and found their properties were maintained for approximately 8 h following construction. The phantom has application to electrical impedance tomography, magnetic resonance electrical impedance tomography, EEG and ECG source imaging and diffusion tensor imaging.
authors.affiliation: J. Crayton Pruitt Department of Biomedical Engineering, University of Florida, Gainesville, USA. sadleir@ufl.edu
authors.forename: Rosalind J
authors.initials: RJ
authors.lastname: Sadleir
authors.forename: Farida
authors.initials: F
authors.lastname: Neralwala
authors.forename: Tang
authors.initials: T
authors.lastname: Te
authors.forename: Aaron
authors.initials: A
authors.lastname: Tucker
mesh_terms: D016880:Anisotropy; D003952:Diagnostic Imaging / Q000379:methods*; D004058:Diffusion; D004553:Electric Conductivity; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005782:Gels / Q000737:chemistry* / Q000528:radiation effects; D006801:Humans; D019047:Phantoms, Imaging; D010992:Plethysmography, Impedance / Q000295:instrumentation*
chemical_list: D005782:Gels