title: MR-based conductivity imaging using multiple receiver coils.
abstract: To propose a signal combination method for MR-based tissue conductivity mapping using a standard clinical scanner with multiple receiver coils.
  
  
  
  The theory of the proposed method is presented with two practical approaches, a coil-specific approach and a subject-specific approach. Conductivity maps were reconstructed using the transceive phase of the combined signal. The sensitivities of the coefficients used for signal combination were analyzed and the method was compared with other signal combination methods. For validation, multiple receiver brain coils and multiple receiver breast coils were used in phantom, in vivo brain, and in vivo breast studies.
  
  
  
  The variation among the conductivity estimates was <15% as determined by the coefficient sensitivity tests. Compared with other signal combination methods, the proposed method yielded fewer artifacts in the conductivity estimates.
  
  
  
  MR-based tissue conductivity mapping is feasible when using a standard clinical MR scanner with multiple receiver coils. The proposed method reduces systematic errors in phase-based conductivity mapping that can occur due to the inhomogeneous magnitude of the combined receive profile. Magn Reson Med 76:530-539, 2016. © 2015 Wiley Periodicals, Inc.
authors.affiliation: Center for Neuroscience Imaging Research, Institute for Basic Science, Sungkyunkwan University, Korea.|Department of Electrical and Electronic Engineering, Yonsei University, Korea.
authors.forename: Joonsung
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Electrical and Electronic Engineering, Yonsei University, Korea.
authors.forename: Jaewook
authors.initials: J
authors.lastname: Shin
authors.affiliation: Department of Electrical and Electronic Engineering, Yonsei University, Korea.
authors.forename: Dong-Hyun
authors.initials: DH
authors.lastname: Kim
mesh_terms: D000465:Algorithms; D001940:Breast / Q000033:anatomy & histology / Q000502:physiology*; D004553:Electric Conductivity; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation* / Q000379:methods*; D008280:Magnetics / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers
keywords: MREPT; conductivity; electrical property imaging; phase-based EPT