Sadeghi-Tarakameh, Alireza Zulkarnain, Nur Izzati Huda He, Xiaoxuan Atalar, Ergin Harel, Noam Eryaman, Yigitcan
Published in
Magnetic resonance in medicine
The purpose of this study is to present a workflow for predicting the radiofrequency (RF) heating around the contacts of a deep brain stimulation (DBS) lead during an MRI scan. The induced RF current on the DBS lead accumulates electric charge on the metallic contacts, which may cause a high local specific absorption rate (SAR), and therefore, heat...
Huang, Shuai Lah, James J Allen, Jason W Qiu, Deqiang
Published in
Magnetic resonance in medicine
Undersampling is used to reduce the scan time for high-resolution three-dimensional magnetic resonance imaging. In order to achieve better image quality and avoid manual parameter tuning, we propose a probabilistic Bayesian approach to recover R2∗$$ {R}_2^{\ast } $$ map and phase images for quantitative susceptibility mapping (QSM), while allowing ...
Qin, Qin Alsop, David C Bolar, Divya S Hernandez-Garcia, Luis Meakin, James Liu, Dapeng Nayak, Krishna S Schmid, Sophie van Osch, Matthias J P Wong, Eric C
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Published in
Magnetic resonance in medicine
This review article provides an overview of the current status of velocity-selective arterial spin labeling (VSASL) perfusion MRI and is part of a wider effort arising from the International Society for Magnetic Resonance in Medicine (ISMRM) Perfusion Study Group. Since publication of the 2015 consensus paper on arterial spin labeling (ASL) for cer...
Piek, Marjolein Ryd, Daniel Töger, Johannes Testud, Frederik Hedström, Erik Aletras, Anthony H
Published in
Magnetic resonance in medicine
To explore a fetal 3D cardiovascular cine acquisition using a radial image acquisition and compressed-sensing reconstruction and compare image quality and scan time with conventional multislice 2D imaging. Volumetric fetal cardiac data were acquired in 26 volunteers using a radial 3D balanced SSFP pulse sequence. Cardiac gating was performed using ...
Clarke, William T. Bell, Tiffany K. Emir, Uzay E. Mikkelsen, Mark Oeltzschner, Georg Shamaei, Amirmohammad Soher, Brian J. Wilson, Martin
Published in
Magnetic resonance in medicine
Purpose Multiple data formats in the MRS community currently hinder data sharing and integration. NIfTI-MRS is proposed as a standard spectroscopy data format, implemented as an extension to the Neuroimaging informatics technology initiative (NIfTI) format. This standardized format can facilitate data sharing and algorithm development as well as ea...
Ahad, James Cummings, Evan Franson, Dominique Hamilton, Jesse Seiberlich, Nicole
Published in
Magnetic resonance in medicine
This work proposes principal component analysis (PCA) coil compression and weight sharing to reduce acquisition and reconstruction time of through-time radial GRAPPA. Through-time radial GRAPPA enables ungated free-breathing motion-resolved cardiac imaging but requires a long calibration acquisition and GRAPPA weight calculation time. PCA coil comp...
May, Markus W Hansen, Sam-Luca J D Mahmutovic, Mirsad Scholz, Alina Kutscha, Nicolas Guerin, Bastien Stockmann, Jason P Barry, Robert L Kazemivalipour, Ehsan Gumbrecht, Rene
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Published in
Magnetic resonance in medicine
To extend the coverage of brain coil arrays to the neck and cervical-spine region to enable combined head and neck imaging at 7 Tesla (T) ultra-high field MRI. The coil array structures of a 64-channel receive coil and a 16-channel transmit coil were merged into one anatomically shaped close-fitting housing. Transmit characteristics were evaluated ...
Chen, Sihao Fraum, Tyler J Eldeniz, Cihat Mhlanga, Joyce Gan, Weijie Vahle, Thomas Krishnamurthy, Uday B Faul, David Gach, H Michael Binkley, Michael M
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Published in
Magnetic resonance in medicine
We evaluated the impact of PET respiratory motion correction (MoCo) in a phantom and patients. Moreover, we proposed and examined a PET MoCo approach using motion vector fields (MVFs) from a deep-learning reconstructed short MRI scan. The evaluation of PET MoCo was performed in a respiratory motion phantom study with varying lesion sizes and tumor ...
Obert, Arnd Jonathan Gutberlet, Marcel Kern, Agilo Luitger Kaireit, Till Frederik Glandorf, Julian Moher Alsady, Tawfik Wacker, Frank Hohlfeld, Jens Michael Vogel-Claussen, Jens
Published in
Magnetic resonance in medicine
To examine the time-dependent diffusion of fluorinated (19 F) gas in human lungs for determination of surface-to-volume ratio in comparison to results from hyperpolarized 129 Xe and lung function testing in healthy volunteers and patients with chronic obstructive pulmonary disease. Diffusion of fluorinated gas in the short-time regime was measured ...
Babaloo, Reza Atalar, Ergin
Published in
Magnetic resonance in medicine
Providing accurate gradient currents is challenging due to the gradient chain nonlinearities, arising from gradient power amplifiers and power supply stages. This work introduces a new characterization approach that takes the amplifier and power supply into account, resulting in a nonlinear model that compensates for the current droop. The gradient...
