ELECTRONIC POSTER - ismrm

Non-Cartesian k-space trajectories are becoming more popular because they allow for large undersampling with acceptable image
quality. In this work, SENC was combined with radial k-space acquisition using interleaved SENC tunings and radial undersampling.
Scan time was reduced to one breath-hold with comparable image quality.
15:00 3591. High Resolution, Functional Real-Time Cardiac MR Imaging Using a Combination
of Compressed Sensing and Parallel Imaging
Tobias Wech 1 , Marcel Gutberlet 1 , Daniel Stäb 1 , Dietbert Hahn 1 , Herbert Köstler 1
1 Institute of Radiology, University of Wuerzburg, Wuerzburg, Bavaria, Germany
To achieve a sufficient temporal and spatial resolution in functional cardiac MRI, real time acquisition has to be accelerated by a
factor of 8 – 10 compared to Fourier MRI. In this work, a combination of compressed sensing and parallel imaging has been
implemented, tested in a simulation using undersampled data of a segmented cine acquisition and finally applied to in-vivo data
sampled in real time. The reconstructions for the real time acquisition and for the simulated data result in high resolution images with
an excellent SNR and do not show any visible artefacts.
Wednesday 13:30-15:30 Computer 30
13:30 3592. Association Between Left Ventricle Sympathetic Innervation and Torsion in
Patients with Type 1 Diabetes
Scott David Swanson 1 , Gisela C. Mueller 1 , David Raffel 1 , Dorthea Happ 1 , Claire S.
Duvernoy 2,3 , Rodica Pop-Busui 4
1 Department of Radiology, University of Michigan, Ann Arbor, MI, United States; 2 Cardiology Section, VA
Ann Arbor Health Care System, United States; 3 Department of Internal Medicine, University of Michigan;
4 Department of Internal Medicine; Division of Metabolism, Endocrinology and Diabetes, , University of
Michigan
We compare left ventricular torsion as measured by cardiac MR tagging with sympathetic denervation as measure by PET and find
that increased torsion is correlated with denervation.
14:00 3593. Myofiber Developmental Plasticity in Fetal and Adult Pig Hearts Delineated with
Diffusion Tensor MRI
Lei Zhang 1 , Huiying Zhang 1 , Gregory M. Lanza 1 , Samuel A. Wickline 1 , Junjie Chen 1
1 Washington University School of Medicine, St. Louis, MO, United States
Cardiac function in pre and post-natal stages are different because of reduced workload of right ventricle relative to left ventricle after
birth. We hypothesize that myocardial fiber structure in fetal hearts differs from that of adult hearts as a response to the change of
cardiac function. Diffusion tensor MRI was used to quantitatively evaluate myofiber structure in mid-gestation, pre-born and adult pig
hearts. Helix angle and transverse angle in septum and LV/RV fusion sites were compared between the three groups. Our results
showed that contributions of RV myofibers to septum was higher in fetal pig hearts than adult pig hearts. The current observations
were in agree with change of cardiac function and reflect the plasticity of myocardial fiber development in response to programmed
differential contractile functions before and after birth.
14:30 3594. Accelerated Simultaneous Multi-Slice Cardiac Cine Imaging Using a Combination
of CAIPIRINHA and Compressed Sensing
Daniel Stäb 1 , Tobias Wech 1 , Christian Ritter 1 , Dietbert Hahn 1 , Herbert Köstler 1
1 Institute of Radiology, University of Wuerzburg, Wuerzburg, Bavaria, Germany
A combination of CAIPIRINHA simultaneous multi-slice imaging with Compressed Sensing is presented. A technique is generated,
effectively accelerating the imaging procedure in slice and phase encoding direction. Several slices are excited simultaneously and
shifted with respect to each other in the FOV using RF phase cycles, while k-space is undersampled randomly in incoherent fashion.
In the reconstruction process, Compressed Sensing is used to eliminate incoherent artifacts, while a parallel imaging reconstruction
separates the simultaneously excited slices. The method shows potential for high quality multi-slice imaging with high acceleration
factor.
15:00 3595. SNR Evaluation of 32 Channel Cardiac Coils in DENSE MRI at 1.5 and 3T
Andreas Sigfridsson 1,2 , Henrik Haraldsson 1,2 , Tino Ebbers 1,2 , Hans Knutsson, 23 , Hajime
Sakuma 4
1 Clinical Physiology, Linköping University, Linköping, Sweden; 2 CMIV, Linköping University, Linköping,
Sweden; 3 Biomedical Engineering, Linköping University, Linköping, Sweden; 4 Radiology, Mie University,
Tsu, Mie, Japan
The in-vivo SNR for DENSE MRI was evaluated for 32 channel cardiac coils compared to standard 5 and 6 channel coils at 1.5 and
3T. On average, the 32 channel coils provided 50% higher SNR. The SNR improvement was more pronounced at 3T than at 1.5T, and
closest to the chest wall. The higher SNR provides the opportunity for DENSE imaging in a longer portion of the cardiac cycle.