MRI-phased array evaluation using a human body model


  • This work was presented in part at the 16th Scientific Meeting of the International Society for Magnetic Resonance in Medicine, May 2008.


We develop methodology to evaluate MRI-phased array receivers using an anatomically and electromagnetically accurate human body model. The human body model accurately represents the different permittivity and conductivity values of various tissue types in the human body, at the frequency of interest. The phased array receiver is a posterior array with 16 coils, typically placed on the patient table for imaging. We obtain the electric and magnetic fields associated with each coil using the finite-difference time-domain method and estimate a simplified metric to evaluate the receiver array contribution to the signal-to-noise ratio (SNR) distribution. The results highlight SNR variation in the left–right direction, an artifact seen in imaging, but not apparent in quasi-static simulations with uniform phantoms. We use the results to compare two design variations of 16-coil phased arrays. In addition, we use the results to compare imaging methods that have potential to reduce the computational complexity of high channel count arrays by reducing the number of data streams used in image reconstruction. © 2010 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 37B: 20–28, 2010