TRADITIONAL POSTER - ismrm

Poster Sessions
3026. Region-Growing Reconstruction for Large-Angle Multiple-Acquisition BSSFP
Brady Quist 1 , Brian A. Hargreaves 2 , Glen R. Morrell 3 , Garry E. Gold 2 , Neal K. Bangerter 1
1 Department of Electrical & Computer Engineering, Brigham Young University, Provo, UT, United States; 2 Department of Radiology,
Stanford University, Stanford, CA, United States; 3 Department of Radiology, University of Utah, Salt Lake City, UT, United States
A novel method for simultaneously suppressing fat and reducing bSSFP banding artifacts in the presence of field inhomogeneity was recently presented,
called large-angle multiple-acquisition (LAMA) bSSFP. LAMA bSSFP requires the acquisition of two phase-cycled SSFP acquisitions and a field map,
although previous work has suggested that an intelligent region-growing algorithm could replace field-map acquisition. In this work, we present such a
region-growing algorithm, and demonstrate that LAMA bSSFP can perform effectively without the acquisition of a field map. Results are presented in the
lower leg of a normal volunteer.
3027. High-Resolution 3D Isotropic Black-Blood Imaging with T2prep Inversion Recovery: Comparison
Between FSE and SSFP
Keigo Kawaji 1 , Thanh D. Nguyen 2 , Beatriu Reig 2 , Pascal Spincemaille 2 , Priscilla A. Winchester 2 , Martin R.
Prince 2 , Yi Wang 1,2
1 Biomedical Engineering, Cornell University, Ithaca, NY, United States; 2 Radiology, Weill Cornell Medical College, New York, NY,
United States
T2prep Inversion Recovery (T2IR) is a magnetization preparation technique that combines two preparations: T2prep and Inversion Recovery, in order to
provide both T1 and T2 contrasts. Subsequently, T2IR provides flow-insensitive global black-blood suppression suited for slow flow at the expense of SNR,
being suitable for 3D volumetric black-blood imaging of vessel walls where slow blood flow is observed. In this study, we examined the performance of
using a T2IR preparation in both FSE and SSFP sequences to image a large 3D coronal volume (20cm x 20cm x 5.2cm) at a submillimeter isotropic spatial
resolution of 0.8mm.
3028. Dark Blood BSSFP Cardiac MRI Using HEFEWEIZEN
Karan Dara 1 , Jamal J. Derakhshan 1 , Jeffrey L. Duerk 1 , Jeffrey L. Sunshine 2 , Mark A. Griswold 1
1 Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, United States; 2 Department of Radiology,
University Hospitals of Cleveland, Cleveland, OH, United States
T2-weighted dark blood prepared TSE sequences are commonly used to image cardiac pathology. These methods often suffer from motion artifacts due to
their long acquisition times. Here we apply a new, fast, high SNR, dark blood prepared segmented TrueFISP sequence (HEFEWEIZEN) for cardiac imaging
in which some TR blocks are replaced by spatially selective saturation pulses for out-of-slice signals. This directionally suppresses bright blood flow (>65%)
in the cardiac ventricles with some stationary tissue signal suppression offering a potential application to cardiac imaging.
3029. Banding Artifact Reduction in 2D CINE Balanced SSFP at 3.0 T Using Phase-Cycling and k-T BLAST
Ute Kremer 1 , Fabian Hezel 2 , Gabriele A. Krombach 1 , Thoralf Niendorf 2,3
1 Department of Diagnostic Radiology, University Hospital, RWTH Aachen, Aachen, Germany; 2 Berlin Ultrahigh Field Facility, Max-
Delbrueck Center for Molecular Medicine (MDC), Berlin, Germany; 3 Charité, University Medicine, Berlin, Germany
This work proposes to combine phase-cycled bSSFP with k-t BLAST to overcome the scan time penalty of multiple-acquisition bSSFP while still
eliminating off-resonance induced banding artifacts at 3.0 T. Acquisitions were conducted using four-fold accelerated k-t BLAST and three phase-cycles.
For comparison conventional bSSFP was obtained and endocardial border sharpness (EBS) assessment was performed. In theory omitting one of the four
standard phase-cycles disturbs the off-resonance profile's flatness, however for in vivo imaging it yielded excellent banding reduction and improved the
mean EBS. Accelerated, phase-cycled bSSFP imaging promises to extend the capabilities of routine CINE imaging at (ultra)high fields.
Rare & Turbo Spin Echo
Hall B Wednesday 13:30-15:30
3030. Reduced SAR with Combined Acquisition Technique (CAT) Hybrid Imaging Sequence at 7 Tesla
Morwan Choli 1 , Felix A. Breuer 1 , Daniel Neumann 2 , Michael Bock 3 , Claudia M. Hillenbrand 4 , Ralf B.
Loeffler 4 , Peter M. Jakob 2,5
1 Research Center Magnetic Resonance Bavaria e.V (MRB) , Wuerzburg, Germany; 2 Dept. of Experimental Physiks 5, University of
Würzburg, Wuerzburg, Germany; 3 Department of Medical Physics in Radiology, , German Cancer Research Center (dkfz),
Heidelberg, Germany; 4 Department of Radiological Sciences, Division of Translational Imaging Research, Memphis, TN, United
States; 5 Research Center Magnetic Resonance Bavaria e.V (MRB), Wuerzburg, Germany
Higher field strength comes along with increase of the deposited SAR energy. Important imaging sequences like TSE with numerous refocusing pulses are
only exercisable with limitations of the parameters at the expense of image quality to protect patients. In this work it is shown that it is possible to obtain
high resolution in vivo images on a 7T scanner with an almost equal signal behavior in a combined acquisition technique (CAT) hybrid sequence consisting
of a TSE module and an EPI module with SAR saving of 27%.
3031. "Spin-Echo Like T1 Contrast" Volumetric Black-Blood Images Using 3D LOWRAT: Low Refocusing
Flip Angle TSE.
Masami Yoneyama 1 , Masanobu Nakamura 1 , Takashi Tabuchi 1 , Atsushi Takemura 2 , Junko Ogura 1
1 Medical Satellite Yaesu Clinic, Chuo-ku, Tokyo, Japan; 2 Philips Electronics Japan, Ltd., Minato-ku, Tokyo, Japan
T1 weighted 3D VRFA-TSE sequence is decreasing flow artifacts by sequence-endogenous flow-void enhancement. But, T1 contrast becomes sub-optimal
with the long echo train and pseudo steady-state effects. We propose a new scheme of more T1-optimized black-blood 3D TSE pulse sequence with low