Distinguishability for magnetic resonance–electrical impedance tomography (MR–EIT)

Abstract

A distinguishability measure is defined for magnetic resonance-electrical impedance tomography (MR-EIT) based on magnetic flux density measurements. This general definition is valid for 2D and 3D structures of any shape. As a specific case, a 2D cylindrical body with concentric inhomogeneity is considered and a bound of the distinguishability is analytically formulated. Distinguishabilities obtained with potential and magnetic flux density measurements are compared.

Two alternatives for magnetic resonance electrical impedance tomography: injected or induced current

“…In both studies, optimum coil current patterns are found by maximizing the distinguishability function. Altunel et al (2007) further utilize the distinguishability concept in MREIT. They expressed the distinguishability of MREIT as a function of magnetic flux density measurements for a conductivity distribution with a concentric inhomogeneity.…”

Current Injection Optimization for Magnetic Resonance-Electrical Impedance Tomography (MREIT)

“…On the other hand, current density distribution of wplane is known [8]. Thus relation between current density distributions of v and w-planes should be found.…”

“…Consider conductivity distributions Based on distinguishability definition in [8], total distinguishability is the sum of differences between magnetic flux densities at all points.…”

“…Limiting the current on each electrode to a safe level is claimed as the proper choice for many EIT applications [7]. Altunel et al [8] defined a distinguishability measure for MREIT, which is based on magnetic flux density since it is the measured quantity in MREIT.…”