TRADITIONAL POSTER - ismrm

Poster Sessions
Hardware optimization as well as sequence modification enable us to obtain heavily T2-weighted images at high-fields in tumor-bearing mice with in-plane
resolution of 117μm and slice thickness of 1mm. Multi-slice datasets covering the entire thorax and abdomen are acquired in ~40 minutes.
2902. ZOOM-PROPELLER-EPI: Non-Axial Imaging at Small FOV with PROPELLER-EPI
Hing-Chiu Chang 1,2 , Chun-Jung Juan 3 , Yi-Jui Liu 4 , Chao-Chun Lin 2,5 , Hao Shen 6 , Tzu-Chao Chuang 7 ,
Hsiao-Wen Chung 2
1 Applied Science Laboratory, GE Healthcare Taiwan, Taipei, Taiwan; 2 Institute of Biomedical Electronics and Bioinformatics,
National Taiwan University, Taipei, Taiwan; 3 Department of Radiology, Tri-Service General Hospital, Taipei, Taiwan; 4 Department
of Automatic Control Engineering, Feng Chia University, Taichung, Taiwan; 5 Department of Radiology, China Medical University
Hospital, Taichung, Taiwan; 6 Applied Science Laboratory, GE Healthcare, Beijing, China; 7 Electrical Engineering, National Sun Yatsen
University, Kaohsiung, Taiwan
Current implementation of PROPELLER-EPI exhibits difficulty in small FOV or non-axial acquisition due to the aliasing artifact along the phase-encoding
direction of each blade. In this work, we propose a ZOOM-PROPELLER-EPI technique, which combines the reducing-FOV (rFOV) EPI to obtain sagittal
images with a small FOV. We combined PROPELLER-EPI with three types of rFOV EPI technique based on inner volume excitation, both phantom and in
vivo results demonstrated effectiveness of ZOOM-PROPELLER-EPI. The proposed method may find applications in non-axial high-resolution scans such as
diffusion-weighted imaging of the cerebellum.
Fat-Water Separation
Hall B Wednesday 13:30-15:30
2903. Quantification of Fatty Acid Compositions Using MR-Imaging and Spectroscopy at 3 T
Pernilla Peterson 1 , Håkan Brorson 2 , Sven Månsson 1
1 Medical Radiation Physics, Lund University, Malmö, Sweden; 2 Plastic and Reconstructive Surgery, Lund University, Malmö,
Sweden
This phantom study aims at investigating the potential of multi-echo imaging and spectroscopy to quantify the fraction unsaturated fatty acids (UF) and
compare the results against known values. Six oil phantoms (UFs: 8%-92%) were measured in a 3T Siemens scanner with PRESS-localized spectroscopy
and multi gradient echo sequences. Two fat resonances were separated from the acquired spectra using jMRUI and from multi-echo images using a linear
least-squares approach. Both methods successfully quantified UFs with slopes/intercepts 0.886/3.80% and 0.956/11.3% for imaging and spectroscopy,
respectively. This experiment successfully demonstrates the ability of multi-echo imaging and spectroscopy to evaluate fatty acid compositions.
2904. Bipolar 3D-FSE-IDEAL: Fast Acquisition of Volumetric T 2 -Weighted Fat and Water
Ananth J. Madhuranthakam 1 , Huanzhou Yu 2 , Ann Shimakawa 2 , Martin P. Smith 3,4 , Scott B. Reeder 5 , Neil
M. Rofsky 3,4 , Charles A. McKenzie 6 , Jean H. Brittain 7
1 MR Applied Science Lab, GE Healthcare, Boston, MA, United States; 2 MR Applied Science Lab, GE Healthcare, Menlo Park, CA,
United States; 3 Radiology, Beth Israel Deaconess Medical Center, Boston, MA, United States; 4 Harvard Medical School, Boston, MA,
United States; 5 Radiology, Medical Physics, Biomedical Engineering and Medicine, University of Wisconsin, Madison, WI, United
States; 6 Medical Biophysics, University of Western Ontario, London, Ontario, Canada; 7 MR Applied Science Lab, GE Healthcare,
Madison, WI, United States
In this work, a bipolar acquisition with 3D-FSE-IDEAL is presented that reduces total scan time by acquiring all three images required for IDEAL
processing in a single repetition. To eliminate phase errors that arise from alternating polarities of the readout gradients, a novel 2D phase correction method
was implemented. High-resolution 3D T 2 -weighted images with uniform fat-water separation are demonstrated in breast and knee applications with less than
5-minute acquisition times.
2905. MR Water/Fat Separation Improves Optical Breast Imaging
Colin Morehouse Carpenter 1 , Shudong Jiang 2 , Brian William Pogue 2 , Keith David Paulsen 2
1 Radiation Oncology, Stanford University School of Medicine, Stanford, CA, United States; 2 Thayer School of Engineering at
Dartmouth, Hanover, NH, United States
IDEAL water/fat separation was used to improve hemoglobin quantification of MR-guided optical imaging. This technique is shown to reduce the cross-talk
between oxyhemoglobin and water, caused by the spectral similarity of these tissue constituents in the near-infrared. It is demonstrated in gelatin phantoms
that this approach reduces error in oxyhemoglobin by 70% on average for several cases. This finding has significant benefit for optical breast imaging, as the
improved quantification provided by the MR water image can be leveraged to reduce the number of wavelengths in the optical data acquisition and thus
increase temporal resolution.
2906. Flexible and Efficient Data Acquisition Technique for 3D-FSE-IDEAL
Ananth J. Madhuranthakam 1 , Huanzhou Yu 2 , Ann Shimakawa 2 , Martin P. Smith 3,4 , Scott B. Reeder 5 , Neil
M. Rofsky 3,4 , Charles A. McKenzie 6 , Jean H. Brittain 7
1 MR Applied Science Lab, GE Healthcare, Boston, MA, United States; 2 MR Applied Science Lab, GE Healthcare, Menlo Park, CA,
United States; 3 Radiology, Beth Israel Deaconess Medical Center, Boston, MA, United States; 4 Harvard Medical School, Boston, MA,
United States; 5 Radiology, Medical Physics, Biomedical Engineering and Medicine, University of Wisconsin, Madison, WI, United
States; 6 Medical Biophysics, University of Western Ontario, London, Ontario, Canada; 7 MR Applied Science Lab, GE Healthcare,
Madison, WI, United States
FSE-IDEAL requires at least three echoes for uniform fat-water separation. The three echoes are commonly acquired in multiple repetitions. Recently,
methods have been proposed to reduce total scan time by acquiring multiple gradient echoes in a repetition. Acquisition of a fourth echo increases the