Optimization of current injection pulse width in MREIT.
In magnetic resonance electrical impedance tomography (MREIT), we inject electrical current into a volume conductor to induce a distribution of magnetic flux density. By measuring the internal magnetic flux density using an MR scanner, we reconstruct images of cross-sectional conductivity and current density distributions. One of the most important technical problems in MREIT is to reduce the noise level in the measured magnetic flux density data since it limits the quality of reconstructed images. The noise level is inversely proportional to the current injection pulse width and signal-to-noise ratio (SNR) of MR magnitude images. Knowing that we cannot simultaneously increase both factors for a chosen echo time, we show that there is an optimal current injection pulse width minimizing the noise level. Experimental results demonstrate that the optimal current injection pulse width and appropriately chosen data acquisition time considerably reduce the noise level. We suggest future works to reduce undesirable side effects due to an increased data acquisition time.
Lee
Byung Il
BI
College of Electronics and Information, Kyung Hee University, Korea.
Park
Chunjae
C
Pyo
Hyun Chan
HC
Kwon
Ohin
O
Woo
Eung Je
EJ
D004553:Electric Conductivity; D017097:Electric Impedance; D007267:Injections; D008279:Magnetic Resonance Imaging / Q000379:methods*; D014054:Tomography / Q000379:methods*