PURPOSE: The purpose of this work was to acquire high quality multislice MR images from the human brain at 8 Tesla (T). METHOD: Initial images were acquired with an 8 T/80 cm magnet designed and manufactured by Magnex Scientific (Abingdon, England). Images were acquired using volume RF coils operating at 340 MHz. A torque-free head gradient insert was utilized to spatially encode the spins. Images were acquired from the human head using gradient-recalled echo pulse sequences. RESULTS: Ultra high frequency (UHF) MR images have been obtained from the human head that display both excellent signal/noise ratio and image quality. The power required to obtain the 8 T images was much less than expected based on the trend obtained at lower fields. CONCLUSION: In this work, we have demonstrated that it is possible to obtain high quality multislice images from the human brain at 8 T. These images display the phenomenal potential for imaging at UHF and reveal that none of the stumbling blocks advanced by the MR community for an 8 T project (RF penetration, dielectric effects, specific absorption rate problems, RF power requirements) proved to be a limitation.
PURPOSE: The purpose of this work was to acquire high quality multislice MR images from the human brain at 8 Tesla (T). METHOD: Initial images were acquired with an 8 T/80 cm magnet designed and manufactured by Magnex Scientific (Abingdon, England). Images were acquired using volume RF coils operating at 340 MHz. A torque-free head gradient insert was utilized to spatially encode the spins. Images were acquired from the human head using gradient-recalled echo pulse sequences. RESULTS: Ultra high frequency (UHF) MR images have been obtained from the human head that display both excellent signal/noise ratio and image quality. The power required to obtain the 8 T images was much less than expected based on the trend obtained at lower fields. CONCLUSION: In this work, we have demonstrated that it is possible to obtain high quality multislice images from the human brain at 8 T. These images display the phenomenal potential for imaging at UHF and reveal that none of the stumbling blocks advanced by the MR community for an 8 T project (RF penetration, dielectric effects, specific absorption rate problems, RF power requirements) proved to be a limitation.
Authors: Ming Yang; Gregory A Christoforidis; Tatiana Figueredo; Johannes T Heverhagen; Amir Abduljalil; Michael V Knopp Journal: Invest Radiol Date: 2005-10 Impact factor: 6.016
Authors: Qing X Yang; Jianli Wang; Jinghua Wang; Christopher M Collins; Chunsheng Wang; Michael B Smith Journal: Magn Reson Med Date: 2010-11-30 Impact factor: 4.668
Authors: Michael M Zeineh; Mansi B Parekh; Greg Zaharchuk; Jason H Su; Jarrett Rosenberg; Nancy J Fischbein; Brian K Rutt Journal: Invest Radiol Date: 2014-05 Impact factor: 6.016