Traditional Posters: Miscellaneous



Yüklə 355,76 Kb.
səhifə14/37
tarix05.01.2022
ölçüsü355,76 Kb.
#63667
1   ...   10   11   12   13   14   15   16   17   ...   37
Donghoon Lee1, Kenneth Marro1, Mark Mathis1, Cecil Hayes1

1University of Washington, Seattle, WA, United States

We report our efforts on continuous development of a synthetic signal injection method for metabolite quantification using MRS and MRI. This work demonstrates that calibrated synthetic voxels (instead of pseudo-FID: free induction decay), injected during or separately from real image acquisition, can be used to quantify metabolite content in real 19F image voxels. Images of vials containing different concentrations of sodium fluoride (NaF) were converted to units of moles by reference to precalibrated synthetically-injected voxels. Additional images of vials containing variable sodium chloride (NaCl) demonstrate that the quantification process is robust and immune to changes in coil loading conditions.



965. Iterative CSI Reconstruction with High-Resoluiton Spatial Priors for Improved Lipid Suppression

Joonsung Lee1, Elfar Adalsteinsson1,2

1Electrical engineering and computer science, Massachusetts Institute of Technology, Cambridge, MA, United States; 2Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, United States

We have developed and demonstrated an iterative reconstruction with spatial priors for improved lipid suppression. By imposing the spatial locality constraint on the lipid spectra inside the brain, we are able to substantially improve lipid suppression from the subcutaneous fat into the brain.



966. Skewed Adiabatic Pulses for Outer Volume Suppression in Single Voxel Spectroscopy

Federico Giove1,2, Francesco Marcocci1, Fabrizio Fasano, 1,3, Mauro DiNuzzo1, Gisela E. Hagberg3, Bruno Maraviglia1,2

1Department of Physics, Sapienza University of Rome, Rome, RM, Italy; 2MARBILab, Enrico Fermi Center, Rome, RM, Italy; 3Neuroimaging Laboratory, Fondazione Santa Lucia IRCCS, Rome, RM, Italy

We developed an outer volume suppression approach for nulling the external signal in single voxel spectroscopy, based on trains of adiabatitic skewed selective pulse. The pulses shape allowed the saturation bands to be prescribed adjacent to the voxel, without loss of signal. The train was tested before STEAM and PRESS acquisition schemes at 3T, and showed excellent performaces both in vitro and in vivo, in particolar for the suppression of exravoxel lipids in the visual cortex. Optimal performances were observed with VAPOR water suppression and short TE STEAM, but the approach worked eqaully well before PRESS at intermediate (30ms) TE



967. Atlas-Based Automated Positioning of Outer Volume Suppression Slices in Short-TE 3D MR Spectroscopic Imaging of the Human Brain

Kaung-Ti Yung1, Chenguang Zhao1, Weili Zheng1, Manel Martinez-Ramon2, Andre van der Kouwe3, Stefan Posse1,4

1Neurology, University of New Mexico School of Medicine, Albuquerque, NM, United States; 2Dept. of Signal Processing and Communications, Universidad Carlos III de Madrid, Madrid, Spain; 3Radiology, Massachusetts General Hospital, Boston, MA, United States; 4Electrical and Computer Engineering, University of New Mexico, Albuquerque, NM, United States

Manual placement of outer volume suppression (OVS) slices in short TE proton MR spectroscopic imaging (MRSI) is time consuming and prone to human error. Here, we introduce an atlas-based approach to optimally positions both the 3D MRSI slab and up to 16 OVS slices in a subject’s head using affine transformation of MRSI slab and OVS slice positions that are optimally placed in MNI space. In vivo 3D short TE (11 ms) Proton-Echo-Planar-Spectroscopic-Imaging (PEPSI) demonstrates consistent spectral quality with the MRSI volume and comparable lipid suppression for automatic and manual OVS placement, which is desirable for clinical research studies.



968. Targeted Fat Characterization with MQC Pathways


Yüklə 355,76 Kb.

Dostları ilə paylaş:
1   ...   10   11   12   13   14   15   16   17   ...   37




Verilənlər bazası müəlliflik hüququ ilə müdafiə olunur ©muhaz.org 2024
rəhbərliyinə müraciət

gir | qeydiyyatdan keç
    Ana səhifə


yükləyin