ELECTRONIC POSTER - ismrm

QASCI system was evaluated via phantom imaging, and demonstrated a nominal 50% improvement in SNR over a larger FOV (34cm
by 34 cm) than the 8 channel cardiac coil, even when evaluated on an element-by-element/channel-by-channel basis.
14:30 3843. An Optimized “QD-Like” 6-Channel Flexible and Ergonomic Shoulder Array Coil
at 1.5T
Xiaoyu Yang 1 , Steven Walk 1 , Paul Taylor 1 , Tsinghua Zheng 1 , Hiroyuki Fujita 1,2
1 Quality Electrodynamics, Mayfield Village, OH, United States; 2 Physics and Radiology, Case Western Reserve
University, Cleveland, OH, United States
The MRI trend sees the increasing availability of wider-bore scanners at 1.5T and 3T to accommodate much broader coverage of the
patient population. Addressing the need, an optimized 6-channel ergonomically-designed shoulder coil is proposed at 1.5T. The coil
consists of 3 rows of loop and saddle pairs with flexible flaps for better fitting of different size shoulder sizes and thereby increasing
SNR. Comparison tests were performed between the proposed flexible coil and a commercially available 4-channel rigid shoulder
coil. The testing and evaluation also included the performance comparison among various shoulder sizes. The results show that the
proposed “one-fits-all” coil provides good SNR, depth coverage and uniformity for the broad range patient population.
15:00 3844. A 8+4-Channel Receive Phased Array for Imaging Newborns and Premature
Infants at 1.5T
Stefan Fischer 1 , Florian M. Meise 2 , Jörn Ewald 2 , Torsten Hertz 2 , Torsten Lönneker-
Lammers 3 , Laura M. Schreiber 1
1 Department of Diagnostic and Interventional Radiology, Section of Medical Physics, University Medical
Center of the Johannes Gutenberg-University, Mainz, RLP, Germany; 2 LMT Medical Systems GmbH, Lübeck,
SH, Germany; 3 Lammers Medical Technology GmbH, Lübeck, SH, Germany
In this study a 8+4-channel receive phased array for optimized MRI of newborns and premature infants at 1.5T was developed. State
of the art MRI coils are mostly designed for adults and suitable to only a limited extent for pediatric and newborn imaging. Several
challenges like imaging of small objects with high resolution and accelerated imaging to prevent motion artifacts can be met by using
an adapted phased array. It provides high signal-to-noise-ratio and the possibility for accelerated imaging. The very compact design
allows using the 8+4-channel array system in a MR safe incubator to minimize environmental stress.
Wednesday 13:30-15:30 Computer 46
13:30 3845. Multi-Coil MR Imaging with a Receive Array of Eight Microcoils
Kai Kratt 1 , Elmar Fischer 2 , Vlad Badilita 1 , Mohammad Mohammadzadeh 2 , Jürgen
Hennig 2 , Jan G. Korvink 1,3 , Ulrike Wallrabe 1,3
1 Dept. of Microsystems Engineering - IMTEK, University of Freiburg, Freiburg, Germany; 2 Dept. of Diagnostic
Radiology, Medical Physics, University Hospital Freiburg, Freiburg, Germany; 3 Freiburg Institute of Advanced
Studies (FRIAS), University of Freiburg, Freiburg, Germany
We present the development of an eight-channel microcoil array as a prototype for the simultaneous detection of signal from samples
at predefined spatial positions. The manufacturing process is fully MEMS compatible, therefore being cost-effective and making the
array suitable for one-time usage. Eight microcoils have been selected for this study, but the number of coils (i.e. positions) could be
extended to the maximum number of receive channels provided by the MRI spectrometer. By varying size, number and mutual
distance of the microcoils, such a multi-coil array can be used for testing detection schemes of parallel imaging techniques.
14:00 3846. Modular, Decoupled Yet Bendable Coil Array System at 3T
Stefan Schonhardt 1 , Andreas Peter 2 , Jan G. Korvink 2,3
1 Department of Microsystems Engineering, University of Freiburg - IMTEK, Freiburg, Germany; 2 Department
of Microsystems Engineering, University of Freiburg - IMTEK, Germany; 3 Freiburg Institute of Advanced
Studies (FRIAS), University of Freiburg - IMTEK, Freiburg, Germany
A hexagonal surface filling coil tiling has been designed and manufactured in a flexible Polyimide foil, featuring additional overlap
loops on all six tips of a hexagon. The loops serve the purpose of decoupling the next neighboring coils. The immediate neighbor coils
are decoupled by overlaps along their edges. The single identical coils are staggered with respect to each other to form an almost
arbitrary large phased array. The respective coupling between the single coils is -20 dB or better, even if bent at a radius of 15 cm
along an arbitrary in-plane direction.
14:30 3847. Development of a Receive-Only Inductively-Coupled RF Coil System to Enhance 1 H
NMR Localized Spectroscopy to Monitor an Implantable Bioartificial Construct at 11.1T
Nelly A. Volland 1 , Thomas H. Mareci 2,3 , Nicholas E. Simpson 4
1 Radiology, University of Utah, Salt Lake City, UT, United States; 2 Biochemistry and Molecular Biology,
University of Florida, Gainesville, FL, United States; 3 McKnight Brain Institute, University of Florida,
Gainesville, FL, United States; 4 Medicine, University of Florida, Gainesville, FL, United States
Introduction: Uniform excitation and highly sensitive signal detection is necessary for optimal MRS of bioartificial constructs,
particularly when determining function. Methods: Receive-only implantable coils were constructed, coated, and integrated with the
macroconstruct. This assembly was inductively-coupled to an external coil and tested in vitro in combination with a transmit-only
volume coil at 11.1T. Results: Studies showed small overall gains in SNR with this system under loaded conditions over a transmitreceive
system, and greater signal uniformity. Conclusion: A receive-only implantable coil system was successfully built and tested.
This system will allow for superior quantitative monitoring of implanted bioartificial organs.