Forward modelling of magnetic induction tomography: a sensitivity study for detecting haemorrhagic cerebral stroke

Med Biol Eng Comput. 2009 Dec;47(12):1301-13. doi: 10.1007/s11517-009-0541-1. Epub 2009 Oct 16.

Abstract

For a magnetic induction tomography (MIT) system operating at 10 MHz, the signals produced by a haemorrhagic cerebral stroke were computed using an anatomically realistic, multi-layer, finite element (FE) head model comprising 12 tissues. The eddy-current problem was approximated using the commercial FE package, Comsol Multiphysics, and the numerical techniques employed were validated using a benchmark test. Mesh convergence for the head model was investigated for first- and second-order elements. MIT signals were computed for strokes of different sizes and locations in the brain to judge the sensitivity of the MIT configuration. The results revealed that for a large peripheral stroke (volume 50 cm(3)), 27% of the signals were above the phase noise level achievable in our current data-collection hardware (approximately 20 m degrees). In order to detect the same percentage of the signals due to a centrally located small stroke, a reduction in phase noise to 1 m degrees was necessary.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Brain Mapping / methods
  • Cerebral Hemorrhage / diagnosis*
  • Humans
  • Magnetics
  • Models, Anatomic
  • Sensitivity and Specificity
  • Signal Processing, Computer-Assisted
  • Stroke / diagnosis*
  • Tomography / methods