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Here, we show that by combining sparse sampling of t1 dimension based on recently developed algorithms for the sparse Fourier (sFFT) transform [6, 7] together with a new method for real-time motion correction ... Two important aspects limit the quality of 2D COSY in-vivo: 1) due to long acquisition times the subject movement leads to motion artifacts and changes in the shimming, and 2) because scan time has to ... The real-time correction of motion and shim update reduces artifacts related to changes in position and drifts of the scanner frequency or the shims. ...doi:10.1016/j.neuroimage.2013.09.034 pmid:24201013 pmcid:PMC4010560 fatcat:dgwr2r2l7jg3bjkrtuuniguzdq
To mitigate these problems, we implemented a 3D MEGA-editing MRS imaging sequence with the following three features: a) Real-time motion correction, dynamic shim updates, and selective reacquisition to ... of GABA+ compared to MEGA-PRESS, leading to clinically feasible scan times for 3D brain imaging. ... Resources provided to Martinos Center by the Center for Functional Neuroimaging Technologies, P41EB015896, a P41 Regional Resource supported by the National Institute of Biomedical Imaging and Bioengineering ...doi:10.1016/j.neuroimage.2014.09.032 pmid:25255945 pmcid:PMC4312209 fatcat:sq3d5ijqt5enrei2pbihmmcjba
Subject motion and scanner instabilities were corrected in real-time using volumetric navigators optimized for 7T, in combination with selective reacquisition of corrupted data to ensure robust subtraction-based ... Our sequence capitalizes on the benefits of ultra-high-field MRSI while successfully mitigating the challenges related to B0/B1+ inhomogeneities, prolonged scan times, and motion/scanner instability artifacts ... Acknowledgments This study received support from the Austrian Science Fund (FWF): KLI 646, P 30701 and J 4124; the FFG Bridge Early Stage Grant #846505. ...doi:10.1016/j.neuroimage.2018.09.039 pmid:30243974 pmcid:PMC7212034 fatcat:2krt5f4c6vdrlirubpsqva46ye
Methods: MRS data, for automated ROI-based labeling, was acquired in two different spatial resolutions using a spiral-encoded, LASER-localized 3D-MRS imaging sequence with and without MEGA-editing. ... To calculate the mean metabolite distribution within selected ROIs, masks of individual brain regions were extracted from structural T1-weighted images using FreeSurfer. ... T., Gagoski, B., Tisdall, M. D., van der Kouwe, A. J., Trattnig, S., et al. (2014b). Real-time motion- and B0-correction for LASER-localized spiral-accelerated 3D-MRSI of the brain at 3T. ...doi:10.3389/fnmol.2019.00028 pmid:30837839 pmcid:PMC6382749 fatcat:fjgkzy6ef5achglwqh6w6w2gfa
Helical scan of the complete abdomen was subsequently performed following an additional intravenous injection of 90 ml of contrast media at a fixed delay of 30 seconds, at 120 kV and with tube current ... Conclusion: Perfusion imaging of the whole pancreas allows for discrimination between changes in pancreatic oedema and necrosis in early phase of severe acute pancreatitis. ... Susceptibility artifacts were higher for T1w-GRE-imaging of the brain at 3 T, compared to the TSE-sequence at 1.5 T (ns) without impact on diagnostic value. ...doi:10.1007/s13244-010-0011-1 pmid:23099631 pmcid:PMC3534347 fatcat:yfnq3lgteja2lfjl66ivdfnoum
In general, the values of CNR reached a plateau at around 8 iterations with an average improvement factor of about 1.7 for processed MRI images. ... The method can be applied to clinical MRI images and will be crucial in order to facilitate diagnosis of tumor progression at the earliest stages. ... ., prospective Lu-177 dosimetry was estimated assuming complete local absorption of β particles only. ...doi:10.1007/s11307-021-01693-y pmid:34982365 pmcid:PMC8725635 fatcat:4sfb3isoyfdhfbiwxfr55gvqym