Fundamental MRI Physics at Ultra-High Field Strength
Description: We developed computer simulation method and software to investigate the effect of radiofrequency field (RF) on MRI signal intensity at ultra-high field strength, RF coil design and RF safety. The outcome clarified the mechanism of both RF field non-uniformity and MR signal inhomogeneity and enabled us to characterize phase and magnitude of the transmit field and receive sensitivity. These solutions have been used to evaluate patient safety from absorbed RF energy and improve the design of RF coils at high field. The method with the computer simulation greatly reduced the cost for advancement of MRI hardware and evaluation of RF safety. These studies demonstrated my ability to apply computer simulation to solve the problems and difficulties presented by MRI techniques and applications.
Reference:
- Wang J, Yang QX, Zhang X, Collins CM, Smith MB, Zhu XH, Adriany G, Ugurbil K, Chen W. Polarization of the RF field in a human head at high field: a study with a quadrature surface coil at 7.0 T. Magn Reson Med. 2002;48(2):362-9. Pubmed Journal
- Yang QX, Wang J, Zhang X, Collins CM, Smith MB, Liu H, Zhu XH, Vaughan JT, Ugurbil K, Chen W. Analysis of wave behavior in lossy dielectric samples at high field. Magn Reson Med. 2002;47(5):982-9. Pubmed Journal
- Yang QX, Wang J, Collins CM, Smith MB, Zhang X, Ugurbil K, Chen W. Phantom design method for high-field MRI human systems. Magn Reson Med. 2004;52(5):1016-20. Pubmed Journal
- Wang J, Ding Y (2017). Estimating absolute phase of radiofrequency fields of transmit and receive coils in a magnetic resonance imaging (MRI) system. (US Prov. App. No. 62/448,116). Pubmed Journal
