TRADITIONAL POSTER - ismrm

Poster Sessions
2913. Cardiac Imaging with Chemical Shift Based Water-Fat Separation at 3T
Karl Kristopher Vigen 1 , Chris J. Francois 1 , Ann Shimakawa 2 , Huanzhou Yu 2 , Scott K. Nagle 1 , Mark L.
Schiebler 1 , Scott B. Reeder 1,3
1 Radiology, University of Wisconsin-Madison, Madison, WI, United States; 2 Applied Science Lab, GE Healthcare, Menlo Park, CA,
United States; 3 Medical Physics, University of Wisconsin-Madison, Madison, WI, United States
Chemical shift based water-fat separation methods have recently been demonstrated for 1.5T cardiac imaging. Higher field strengths (most notably 3T) are
increasingly used in cardiac imaging, but water-fat separation techniques can be challenging due to proportionately higher resonance frequency offsets. An
interleaved multi-echo sequence using the IDEAL water-fat method has been developed for cardiac imaging at 3T and applied to the evaluation of delayedenhancement
imaging and other fat-containing pathologies.
2914. Feasibility of T2* Estimation with Chemical Shift-Based Water-Fat Separated Cardiac Imaging
Karl Kristopher Vigen 1 , Huanzhou Yu 2 , Chris J. Francois 1 , Ann Shimakawa 2 , Scott B. Reeder 1,3
1 Radiology, University of Wisconsin-Madison, Madison, WI, United States; 2 Applied Science Lab, GE Healthcare, Menlo Park, CA,
United States; 3 Medical Physics, University of Wisconsin-Madison, Madison, WI, United States
T2* mapping has previously been investigated in cardiac imaging for iron overload assessment and detection of myocardial BOLD effects. Advanced T2*
measurement techniques have been previously demonstrated with chemical shift-based fat-water separation techniques in applications such as iron- and fatcontent
measurement in the liver, and chemical shift-based fat-water decomposition methods have been used to separate fat and water in cardiac imaging. In
this work, the feasibility of T2* mapping with chemical shift-based fat-water decomposition in cardiac imaging is demonstrated.
2915. Determination of Body Compartments at 1.5 and 3 Tesla, Combining Three Volume Estimation
Methods
Tania Buehler 1 , Nicolas Ramseier 1 , Juergen Machann 2 , Nina Schwenzer 2 , Chris Boesch 1
1 Dept. of Clinical Research, University of Bern, Bern, Switzerland; 2 Dept. of Diagnostic Radiology, Eberhard-Karls-University of
Tübingen, Tübingen, Germany
Insulin resistance and the metabolic syndrome are cardiovascular risk factors with enormous consequences for the individual patient and the health care
system. They can be linked with whole body fat (WBF), visceral adipose tissue (VAT), lean body volume (LBV), and whole body volume (WBV) imaged
with MRI. In this study, a method is proposed and tested that uses point counting algorithms to determine the above mentioned body compartments in two
groups of age-, weight-, height-, and BMI-matched volunteers at 1.5 and 3 Tesla.
2916. Autocalibrating Correction of Spatially Variant Eddy Currents for Three-Point Dixon Imaging
Holger Eggers 1 , Adri Duijndam 2
1 Philips Research, Hamburg, Germany; 2 Philips Healthcare, Best, Netherlands
The use of bipolar readout gradients in three-point Dixon imaging increases scan efficiency and separation robustness, but eddy currents lead to phase
variations that do not adhere to the assumed linear evolution over echo time. In first approximation, these phase variations are limited to one spatial direction
and are easily removed prior to the separation. For large volumes, however, this approximation becomes inaccurate. A correction of these phase variations in
all directions that requires no additional calibration data is proposed in this work and demonstrated to substantially improve the fat suppression over large
volumes in three-point Dixon imaging.
2917. Three Echo Dixon Water-Fat Separation for Cardiac Black Blood Turbo Spin Echo Imaging
Peter Koken 1 , Holger Eggers 1 , Tobias Schaeffter 2 , Peter Börnert 1
1 Philips Research Europe, Hamburg, Germany; 2 Divison of Imaging Sciences, King's College , London, United Kingdom
Turbo spin echo (TSE) sequences with black blood and fat suppression preparation pulses are widely used in cardiac MRI. In the presence of B 0
inhomogeneity the common prepulse fat suppression techniques often fail. Furthermore, it was recently shown, that the amount and the distribution of fat in
the heart could be of diagnostic value. We propose the combination of black blood TSE with a three echo GRASE-like readout and an iterative water fat
separation reconstruction without restrictions to the inter echo time. Data were acquired ECG-triggered during breath-hold at both polarities of the readout
gradient and combined with accelerated parallel imaging. The combination of TSE with the three point Dixon method could be an interesting new tool in
cardiac MRI.
2918. Water Fat Separation with Undersampled TSE BLADE Based on Three Point Dixon
Qiang He 1,2 , Dehe Weng 1,3 , Xiaodong Zhou 1,2 , Marc Beckmann 1 , Cheng Ni 1,2
1 Siemens Mindit Magnetic Resonance Co. Ltd., Shenzhen, Guangdong, China; 2 Life Science and Technology School, Tongji
University, Shanghai, China; 3 Beijing MRI Center for Brain Research, Institute of Biophysics, Chinese Academy of Sciences, Beijing,
China
By the method of integrating the total variation regularized iterative reconstruction and water fat separation calculation, the water and fat images with robust
and high quality is reconstructed from the undersampled TSE BLADE three point Dixon with less scanning time comparing with full coverage of BLADE k-
space trajectory. The final fat and water images have less streaking artifacts comparing with conventional regridding reconstruction methods followed by
water-fat separation. Meanwhile, inheriting the benefits of the BLADE scanning, the present method is less sensitive to the motions comparing with
Cartesian sampling.