Experimental results for 2D magnetic resonance electrical impedance tomography (MR-EIT) using magnetic flux density in one direction


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Birgul O., Eyuboglu B. , Ider Y.

PHYSICS IN MEDICINE AND BIOLOGY, cilt.48, ss.3485-3504, 2003 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 48 Konu: 21
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1088/0031-9155/48/21/003
  • Dergi Adı: PHYSICS IN MEDICINE AND BIOLOGY
  • Sayfa Sayıları: ss.3485-3504

Özet

Magnetic resonance electrical impedance tomography (MR-EIT) is an emerging imaging technique that reconstructs conductivity images using magnetic flux density measurements acquired employing MRI together with conventional EIT measurements. In this study, experimental MR-EIT images from phantoms with conducting and insulator objects are presented. The technique is implemented using the 0.15 T Middle East Technical University MRI system. The dc current method used in magnetic resonance current density imaging is adopted. A reconstruction algorithm based on the sensitivity matrix relation between conductivity and only one component of magnetic flux distribution is used. Therefore, the requirement for object rotation is eliminated. Once the relative conductivity distribution is found, it is scaled using the peripheral voltage measurements to obtain the absolute conductivity distribution. Images of several insulator and conductor objects in saline filled phantoms are reconstructed. The L2 norm of relative error in conductivity values is found to be 13%, 17% and 14% for three different conductivity distributions.