ELECTRONIC POSTER - ismrm

Thursday 13:30-15:30 Computer 45
13:30 3833. A Stripline-Like Coil Element Structure for High Field Phased Array Coils and Its
Application for a 8-Channel 9.4T Small Animal Transceive Array
Yu Li 1 , Ewald Weber 1 , BingKeong Li 1 , Feng Liu 1 , Johannes Schneider 2 , Stéphanie
Ohrel 2 , Sven Junge 2 , Peter Ullmann 2 , Markus Wick 2 , Stuart Crozier 1
1 School of ITEE, The University of Queensland, Brisbane, Queensland, Australia; 2 Bruker BioSpin MRI
GmbH, Ettlingen, Germany
In this work, the development of an optimized, shielded 8-element transceive volume-array for small animal MRI applications at 9.4T
is discussed. A novel stripline-like sandwiched conductor structure for the coil element has been proposed. A prototype was
constructed and tested in a Bruker 9.4T Biospec MRI system. Simulated and experimental results presented herein demonstrate the
potential of the design.
14:00 3834. A Novel TxRx Head Coil for Visual Stimulation FMRI with High Signal Stability
Huabin Zhu 1,2 , Yanxia Li 2 , Bida Zhang 3 , Jianmin Wang 1 , Yan Zhuo 2 , Rong Xue 2
1 Radio Frequency Department, Siemens Mindit Magnetic Resonance Ltd., Shenzhen, Guangdong, China; 2 State
Key Lab. of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing,
China; 3 Siemens Mindit Magnetic Resonance, Siemens Healthcare MR Collaboration NE Asia, Shenzhen,
Guangdong, China
A large portion of fMRI experiments include visual stimulation. An unblocked vision window can improve subject's coziness, and
hence improve the reliability of visual stimulation experiment. Normally fMRI experiments demand high stability of MRI scanners
including coil and other components, to ensure stable signal magnitude for temporal measurements. Using Siemens Trio Tim system
and its 12-ch head coil, the signal fluctuation with a signal shot EPI sequence without stimulation can be about 0.4-0.5 percent on
water phantom. In this project, we developed an 8-ch TxRx phase-array head coil , which has two obvious advantages in fMRI. First,
a rectangular window of size 116mmx74mm is opened in the upper part of the coil to provide a comfortable vision view for subjects.
Second, there is significant improvement in signal stability, which helps to detect the small signal change during fMRI scanning.
14:30 3835. Design and Comparison of Two 8-Channel Transmit/Receive Radiofrequency
Arrays for in Vivo Rodent Imaging on a 7T Human Whole-Body MRI System
Stephan Orzada 1,2 , Stefan Maderwald 1,2 , Sophia L. Göricke 2 , Nina Parohl 2 , Susanne C.
Ladd 1,2 , Mark E. Ladd 1,2 , Harald H. Quick 1,3
1 Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen, NRW, Germany; 2 Department of Diagnostic
and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, NRW, Germany; 3 Institute
of Medical Physics, Friedrich-Alexander-University Erlangen-Nurnberg, Erlangen, Germany
MRI of rodents is an ever growing application when translatory imaging research “from mouse to man” is envisioned. In this study,
two different multi-channel transmit/receive radiofrequency coil arrays have been designed for high-resolution rodent imaging on a 7T
whole-body human MRI system. Both arrays have been evaluated in comparative phantom experiments and in vivo high-resolution
MRI in rats. Both coil setups provided high signal-to-noise-ratio in rodents. While the 8-channel loop radiofrequency array with its
larger inner diameter provided better overall signal homogeneity, the 8-channel novel stripline radiofrequency array design provided
overall higher signal-to-noise-ratio and better parallel imaging acceleration performance.
15:00 3836. A 3.0-Tesla Transmit and 32-Channel Receive Head Array Coil
Tsinghua Zheng 1 , Craig Lawrie 1 , Xiaoyu Yang 1 , Joseph Herczak 1 , Paul Taylor 1 , Hiroyuki
Fujita 1,2 , Takahiro Ishihara 3 , Kazuya Okamoto 3 , Sadanori Tomiha 3 , Kaori Togashi 4 ,
Tomohisa Okada 4
1 Quality Electrodynamics, LLC, Mayfield Village, OH, United States; 2 Departments of Physics and Radiology,
Case Western Reserve University, Cleveland, OH, United States; 3 Toshiba Medical Systems Corporation,
Otawara, Tochigi, Japan; 4 Department of Diagnostic Imaging and Nuclear Medicine, Kyoto University
Graduate School of Medicine, Kyoto, Japan
We have developed a 3-Tesla head array with an integrated local birdcage transmit coil and 32-receive surface coils for much higher
spatial and temporal resolution head imaging. The coil was tested on a Toshiba 3T Atlas 32-Channel MRI System. Benchmarking
with a commercially-available 1.5-Tesla 14-channel receive-only head array coil, the proposed Tx-and-32Rx head coil showed a
significant improvement in image quality with respect to the SNR enhancement and much improved temporal resolution that are well
expected from a higher channel count array coil.