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Poster Sessions 3088. Dynamic Frequency Drift Correction for Binomial Water Excitation Dehe Weng 1,2 , Feng Xiu 3 , Xiaodong Zhou 1,4 , Qiang He 1,4 1 Siemens Mindit Magnetic Resonance Ltd, Shenzhen, Guangdong, China; 2 Beijing MRI Center for Brain Research, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China; 3 Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, Guangdong, China; 4 Life Science and Technology School, Tongji University, Shanghai, China Binomial water excitation is useful in low field MR system (
Poster Sessions images using spatially dependent filters and omission of background voxels from the filtering calculations. The method is shown to successfully reveal structural detail in the cortical surface that is otherwise obscured in traditional filtering methods. 3095. Correction of RF Inhomogeneities in FLASH-Based T1 Mapping Using Unified Segmentation Nikolaus Weiskopf 1 , Antoine Lutti 1 , Gunther Helms 2 , John Ashburner 1 , Chloe Hutton 1 1 Wellcome Trust Centre for Neuroimaging, UCL Institute of Neurology, University College London, London, United Kingdom; 2 MR- Research in Neurology and Psychiatry, University Medical Center, Göttingen, Germany Quantitative T1 mapping based on variable flip angle acquisitions requires precise knowledge of the local flip angle and is therefore usually combined with RF transmit mapping methods. RF transmit mapping is not readily available and requires extra scan time. We propose a method to correct for RF inhomogeneities that does not require measured RF maps. The method uses the unified segmentation and bias correction approach implemented in SPM8 to simultaneously estimate and correct for the RF inhomogeneities from the T1 maps. The model-based approach is shown to reduce the bias in T1 maps by more than 50%. 3096. Improved Contrast and Image Homogeneity with BIR4 Pulses in Magnetization Prepared Flair at 7 Tesla Jaco J.M. Zwanenburg 1 , Fredy Visser, 12 , Vincent O. Boer 1 , Wybe JM van der Kemp 1 , Dennis W. Klomp 1 , Peter R. Luijten 1 1 Radiology, University Medical Center Utrecht, Utrecht, Netherlands; 2 Philips Healthcare, Best, Netherlands It is shown that using BIR4 pulses for excitation and magnetization prepared inversion, can considerably improve the image homogeneity and contrast of FLAIR images at 7 Tesla, in areas with inhomogeneous B1+ fields. 3097. Distance Weighted B1 Uniformity Correction for Multiple Channel Image Reconstruction Fred J. Frigo 1,2 , Brian W. Thomsen 1,2 , Joshua V. Marso 1,2 , Jason M. Darby 1,2 , Stephen A. Verdi 1,2 , Chad A. Rowland 1,2 1 GE Healthcare, Waukesha, WI, United States; 2 Marquette University, Milwaukee, WI, United States Conventional multiple channel image reconstruction benefits from increased signal-to-noise ratios however hyper-intensity near coil elements can lead to difficulties in the evaluation of images. We present a novel approach for multiple-channel magnetic resonance image reconstruction with pixel intensity corrections for B1 non-uniformity. Coil sensitivity maps are generated from the actual data acquired during a scan, so this is a self-referencing technique. The coil sensitivity maps for each channel are generated based on the Euclidean distance of pixels from each individual coil image to the coil elements. 3098. Non Uniformity Correction Using Cosine Functions and Total Variation Constraint in Musculoskeletal Nmr Imaging Noura Azzabou 1,2 , Paulo Loureiro de Sousa 1,2 , Pierre G. Carlier 1,2 1 NMR Laboratory, Institute of Myology, Paris, France; 2 NMR Laboratory, CEA, I2BM, MIRCen, IdM, Paris, France We introduced here a new technique for non homogeneity correction that does not rely on prior knowledge about all the tissues in the image. To estimate the non uniformity field, we assumed that it can be modelled as a finite sum of cosine functions. To compute the parameters of the model, we minimised the variance of the image in the subcutaneous fat region under the constraint that the total variation of the field is minimum. The later constraint is the main contribution of this paper. Experimental results, on phantom, healthy subjects and pathological cases showed the efficiency of our model. 3099. Phase Correction in Bipolar Multi-Echo Water-Fat Separation for Off-Isocenter Imaging Hojin Kim 1,2 , Kyung Sung 1 , Misung Han 1,2 , Marcus Alley 1 , Wenmiao Lu 3 , Brian Andrew Hargreaves 1 1 Department of Radiology, Stanford University, Stanford, CA, United States; 2 Department of Electrical Engineering, Stanford University, Stanford, CA, United States; 3 School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore Bipolar multi-echo sequence benefits from reducing scan time as well as motion artifacts at the cost of several sources of phase discrepancy due to the polarity reversal in the readout gradient. To address phase correction in bipolar sequences, this work proposes the use of simple reference scan with baseline projections, which corrects linear and constant phase errors. Significantly, this proposed method is applied for off-isocenter imaging, so that accurate waterfat separation in bipolar sequence is capable at any scan location. Correcting Hardware Imperfections Hall B Thursday 13:30-15:30 3100. An Efficient Correction Technique for Constant, Linear and ‘Oblique’ Phase Errors in EPI- PROPELLER Novena Rangwala 1,2 , Xiaohong Joe Zhou 1,3 1 Center for Magnetic Resonance Research, University of Illinois Medical Center, Chicago, IL, United States; 2 Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, United States; 3 Departments of Radiology, Neurosurgery and Bioengineering, University of Illinois Medical Center, Chicago, IL, United States A new technique for phase correction of individual blades for EPI-PROPELLER sequences is proposed. Constant, linear, and ‘oblique’ phase corrections are performed by synthesizing the reference scans for arbitrary blade orientations, using only two reference scans acquired in orthogonal directions. This
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Poster Sessions TRADITIONAL POSTER
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Poster Sessions 793. Characterizati
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Poster Sessions BME increases post-
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Poster Sessions 814. Impact of Diff
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825. Assessment of Subchondral Bone
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Poster Sessions 837. Quantification
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Poster Sessions 848. Application of
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Poster Sessions 859. Post-Ischemic
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Poster Sessions 870. Sodium Concent
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Poster Sessions 880. High-Resolutio
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Poster Sessions data using the mult
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Poster Sessions 902. Regularized Sp
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Poster Sessions 914. Localized 31 P
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Poster Sessions 926. Acute Effect o
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Poster Sessions 938. Determination
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Poster Sessions 951. In Vivo Temper
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Poster Sessions 962. Correction of
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Poster Sessions 975. In Vivo Charac
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Poster Sessions quantitative sodium
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Poster Sessions 997. 19 F Magnetic
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Poster Sessions 1011. Optimized Res
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Poster Sessions and treatment strat
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Poster Sessions Electron Spin Reson
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Poster Sessions University College
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Poster Sessions 1055. A Hydraulic D
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Poster Sessions 1065. Levo-Tetrahyd
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Poster Sessions 1075. A Low-Cost Ex
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Poster Sessions 1087. Quantitative
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Poster Sessions distortion, we used
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Poster Sessions fMRI Modeling & Sig
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Poster Sessions 1125. Linearity of
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Poster Sessions contrast mechanisms
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Poster Sessions Setting appropriate
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Poster Sessions 1161. A Novel Data
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Poster Sessions 1172. Resting-State
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Poster Sessions 1183. Examining Str
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1195. Complexity in the Spatiotempo
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Poster Sessions weeks) after experi
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Poster Sessions 1219. Layer Specifi
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Poster Sessions 1229. Effects of Do
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1240. Whole-Heart Water/Fat Resolve
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Poster Sessions 1252. High Resoluti
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Poster Sessions 1264. Symptomatic P
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Poster Sessions 1277. Serial Contra
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Poster Sessions 1287. Fast Quantita
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Poster Sessions 1298. Cardiac Free-
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Poster Sessions Myocardial Perfusio
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Poster Sessions With the control sy
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Poster Sessions Flow Quantification
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Poster Sessions strong similarities
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Poster Sessions 1354. MRI Measureme
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Poster Sessions 1366. Volumetric, 3
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Poster Sessions 1377. T1 Contrast o
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Poster Sessions 1387. Comparison of
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Poster Sessions 1400. Measuring Pul
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Poster Sessions sliding window reco
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Poster Sessions 1424. Non-Contrast-
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Poster Sessions 1437. Realtime Cine
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Poster Sessions calculated, which m
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Poster Sessions 1462. Dental MRI: C
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Poster Sessions 1474. A Complementa
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Poster Sessions Receive Arrays & Co
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Poster Sessions 1499. A 4-Element R
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Poster Sessions 1510. Inductive Cou
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Poster Sessions 1522. Transmit Coil
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Poster Sessions 1534. Magnetic Fiel
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Poster Sessions treadmill speed and
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Poster Sessions correlation. Positi
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Poster Sessions 1569. White Matter
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Poster Sessions 1581. On the Influe
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Poster Sessions 1593. Maximum Likel
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Poster Sessions 1604. Effects of Tu
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1615. 3D PROPELLER-Based Diffusion
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Poster Sessions 1627. A Novel Robus
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Poster Sessions inhomogeneity-relat
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Poster Sessions 1651. Repeatability
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Poster Sessions 1661. Characterizat
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Poster Sessions 1672. Towards Image
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Poster Sessions MARDI Hall B Thursd
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Poster Sessions 1696. In the Pursui
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Poster Sessions 1708. Hyperammonemi
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Poster Sessions 1719. Improved Veno
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Poster Sessions increase in cerebra
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Poster Sessions 1742. Reduced Speci
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Poster Sessions 4 Centre for Neuroi
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Poster Sessions 1766. Combined Asse
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Poster Sessions Arterial Spin Label
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Poster Sessions 1788. Joint Estimat
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Poster Sessions ultrasound disrupti
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Poster Sessions 1811. MR-Guided Unf
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Poster Sessions 1821. Optimal Multi
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Poster Sessions 1845. Development a
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Poster Sessions 1856. Post-Mortem I
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1867. Assessment of Macrophage Depl
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Poster Sessions 1878. Lipid-Coated
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Poster Sessions 1890. Thiol Complex
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Poster Sessions solution results in
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Poster Sessions 1914. Fluorinated L
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Poster Sessions 1926. T1 Mapping of
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Poster Sessions 1948. Fully-Automat
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Poster Sessions 1969. Regional and
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Poster Sessions 2010. Correlation B
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Poster Sessions 2078. A New MRI Ana
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Poster Sessions 2090. Absolute Quan
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Poster Sessions 2100. A Voxel Based
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Poster Sessions 2120. Detection of
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Poster Sessions 2182. The Effect of
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Poster Sessions 2211. Brain MR Imag
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Poster Sessions significantly corre
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Poster Sessions 2243. Identifying t
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Poster Sessions 2255. High Resoluti
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Poster Sessions MRA with 1.6mm slic
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Poster Sessions 2277. Investigation
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Poster Sessions 2288. Adaptive Chan
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Poster Sessions 2299. Short-Long Fu
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Poster Sessions 2334. The Inter-Sca
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Poster Sessions 2378. Effects of Co
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2390. In Vitro Proton MRS of Cerebr
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Poster Sessions 2401. Increased Bra
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Poster Sessions the study of large
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Poster Sessions 2423. Diffusion Ten
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Poster Sessions 2433. A DTI-Based A
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Poster Sessions cases on the pathol
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Poster Sessions 2455. Diffusion Ten
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Poster Sessions 2478. Preliminary R
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Poster Sessions good visualization
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Poster Sessions breasts. Here, we s
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Poster Sessions 2513. Non-Invasive
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Poster Sessions 2524. Blood Supply
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Poster Sessions 2534. Detection and
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Poster Sessions of HP 129Xe in show
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Poster Sessions that no single exch
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Poster Sessions 2568. Relaxation of
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Poster Sessions Hepato-Biliary & Li
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Poster Sessions 2592. Flip Angle Op
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Poster Sessions predominately from
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Poster Sessions 2626. Qualitative a
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Poster Sessions 2636. Could Obesity
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Poster Sessions 2648. A Novel Whole
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Poster Sessions diverse duodenal re
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Poster Sessions 2672. MR Imaging in
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Poster Sessions 2684. Measuring Glo
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Poster Sessions Tumor Therapy Respo
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Poster Sessions 2706. MRI Molecular
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Poster Sessions 2718. Serial R 2 *
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Poster Sessions Akaike model select
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Poster Sessions thyroid tumor model
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Poster Sessions 2751. Maximizing Ac
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Poster Sessions 2762. MR Determind
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