ELECTRONIC POSTER - ismrm

technique on the quality factor was discussed. A piezoelectric-based displacement device was proposed to perform a precise
positioning of a tuning element and a fine resonance frequency control.
14:00 3906. Development of Multilayer Coil Using Non-Planar MEMS Process for Intraluminal
MRI Probe
Shizuo Ichimura 1 , Wei Quan 2 , Tadao Matsunaga 2 , Yuichiro Matsuoka 3 , Kagayaki
Kuroda 4 , Yoichi Haga 2
1 KANEKA Corporation, Settsu, Osaka, Japan; 2 Graduate School of Biomedical Engineering, Tohoku
University, Sendai, Miyagi, Japan; 3 Graduate School of Medicine, Kobe University, Japan; 4 Dept. of Human &
Information Science, Tokai University, Japan
Intraluminal MRI probe holds promise to achieve high resolution image of small pathological lesion such as the vessel plaque
comparing to the conventional MRI scanner. The MR signal receive coil is expected to be characterized by high signal-noise-ratio
(SNR), good signal homogeneity and small size. By employing the developed photolithography technology on cylinder substrates, the
MRI receive coil for the intraluminal application can be fabricated arbitrarily with the accurate and optimized shape. Comparing to
previous single layer coil, this study presents the design of the multilayer receive coil for improving the imaging performance.
14:30 3907. B1 and B0 Mapping of a Micro Helix Coil at 9.4T
Mohammad Mohammadzadeh 1 , Hans Weber 1 , Nicoleta Baxan 1 , Vlad Badilita 2 , Julian
Maclaren 1 , Jurgen Hennig 1 , Dominik v. Elverfeldt 1
1 Dept. of Diagnostic Radiology, Medical Physics, University Hospital Freiburg, Freiburg, Germany; 2 Dept. of
Microsystems Engineering-IMTEK, University of Freiburg, Freiburg, Germany
In this study the performance of a five turns micro helix coil wound on an SU8 cylinder, was evaluated by mapping its 2D B1 and B0
fieldâ€s distribution. These tests are done inside doped water phantom, on a 9.4T using 3D GE sequences. B1 maps are acquired
using multi flip angle MFA method and B0 mapping are performed by measuring frequency deviation inside a doped water phantom.
In General, Results show that coil has enough SNR and provides minimum frequency deviation and maximum B1 uniformity across
the sample and particularly at the coil center.
15:00 3908. Systematic Characterization of Small Inductively Coupled Radiofrequency Coils as
MR-Visible Markers at 1.5T
Nikita Garnov 1 , Gregor Thörmer 1 , Wilfried Gründer 2 , Robert Trampel 3 , Michael Moche 1 ,
Thomas Kahn 1 , Harald Busse 1
1 Diagnostic and Interventional Radiology, Leipzig University Hospital, Leipzig, Germany; 2 Institute of Medical
Physics and Biophysics, University of Leipzig, Leipzig, Germany; 3 Max Planck Institute for Human Cognitive
and Brain Sciences, Leipzig, Germany
Small inductively coupled RF coils in solenoid design were systematically evaluated as MR-visible markers at 1.5T. Coil performance
was assessed for different flip angles, ±240 mm translations from the isocenter, and tilting of the coil axis with respect to the
transverse plane using a balanced SSFP sequence. Marker contrast was highest at very low FAs (0.2°-0.6°) and was also sufficiently
high for automatic marker detection throughout the entire FOV and for tilt angles up to 55°. Coil heating was measured during 10-
minute RF expositions using different clinical pulse sequences (SAR