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A low-rank deep image prior reconstruction for free-breathing ungated spiral functional CMR at 0.55  T and 1.5 T
ConclusionFeasibility of real-time functional cardiac imaging using a low-rank deep image prior reconstruction was demonstrated in healthy subjects on a commercial 0.55  T scanner. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 12, 2023 Category: Materials Science Source Type: research

A vision of 14  T MR for fundamental and clinical science
ConclusionsThe 14 Tesla system will offer new perspectives in neuroscience and fundamental research. We anticipate that this initiative will usher in a new era of ultra-high-field MR. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 10, 2023 Category: Materials Science Source Type: research

Germany ’s journey toward 14 Tesla human magnetic resonance
AbstractMultiple sites within Germany operate human MRI systems with magnetic fields either at 7 Tesla or 9.4 Tesla. In 2013, these sites formed a network to facilitate and harmonize the research being conducted at the different sites and make this technology available to a larger community of researchers and clinicians not only within Germany, but also worldwide. The German Ultrahigh Field Imaging (GUFI) network has defined a strategic goal to establish a 14 Tesla whole-body human MRI system as a national research resource in Germany as the next progression in magnetic field strength. This paper summarizes the history of ...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 8, 2023 Category: Materials Science Source Type: research

High-resolution imaging of the excised porcine heart at a whole-body 7  T MRI system using an 8Tx/16Rx pTx coil
ConclusionThe receive sensitivity and parallel imaging capability of the dedicated coil were superior to that of a commercial 1Tx/32Rx head coil in both SNR and T2*-mapping. The array was successfully tested to acquire ultra-high-resolution (0.1  × 0.1 × 0.8 mm voxel) images of post-infarction scar tissue. High-resolution (isotropic 1.6 mm3 voxel) diffusion tensor imaging-based tractography provided high-resolution information about normal myocardial fiber orientation. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 7, 2023 Category: Materials Science Source Type: research

Multi-feed, loop-dipole combined dielectric resonator antenna arrays for human brain MRI at 7  T
DiscussionThis work provides novel insights into the rectangular DRA design for high field MRI and shows that the loop-only feed should be used instead of the dipole-only in transmit mode to achieve the highest B1+ and SAR efficiency, while the loop-dipole should be the best suited in receive mode to obtain the highest SNR in spherical samples of similar size and electrical properties as the human head. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 5, 2023 Category: Materials Science Source Type: research

Simulation-based evaluation of SAR and flip angle homogeneity for five transmit head arrays at 14  T
Discussion and conclusionFor most arrays and regular imaging, the constraint on head SAR is reached before constraints on peak local SAR are violated. Furthermore, the different drive vectors inkT-points alleviate strong peaks in local SAR. Flip angle inhomogeneity can be alleviated bykT-points at the expense of larger power deposition. ForkT-points, the dipole arrays seem to outperform loop coil arrays. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - March 31, 2023 Category: Materials Science Source Type: research

MRI safety considerations associated with low-field MRI: mostly good news
(Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - March 28, 2023 Category: Materials Science Source Type: research

Prediction of motion induced magnetic fields for human brain MRI at 3  T
ConclusionThe proposed simulation strategy is able to predict movement-induced B0 field inhomogeneities yielding more precise estimates of the ground truth field homogeneity than the transformed FM. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - March 25, 2023 Category: Materials Science Source Type: research

Histopathological graded liver lesions: what role does the IVIM analysis method have?
ConclusionUsing extrapolatedf is the most effective method of distinguishing liver lesions using IVIM parameters. The comparison between groups does not depend on the fitting method only for parameterD. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - March 21, 2023 Category: Materials Science Source Type: research

Specific absorption rate (SAR) simulations for low-field ( & lt;  0.1 T) MRI systems
ConclusionThis work presents a comprehensive overview of the transmit and SAR efficiencies for RF coils used for POC MRI neuroimaging. While SAR is not a problem for conventional sequences, the values derived here should be useful for RF intensive sequences such asT1 ρ, and also demonstrate that if very short RF pulses are required then SAR calculations should be performed. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - March 18, 2023 Category: Materials Science Source Type: research

Numerical approach to investigate MR imaging artifacts from orthopedic implants at different field strengths according to ASTM F2119
ConclusionIn conclusion, the numerical approach could be used in the future to extend MR safety testing according to a revision of the ASTM F2119 standard and for design optimization during the development process of implants. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - March 18, 2023 Category: Materials Science Source Type: research

Radiofrequency antenna concepts for human cardiac MR at 14.0  T
DiscussionMRI of the human heart at 14.0  T is feasible from an electrodynamic and theoretical standpoint, provided that multi-channel high-density antennas are arranged accordingly. These findings provide a technical foundation for further explorations into CMR at 14.0 T. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - March 15, 2023 Category: Materials Science Source Type: research

Optimization of cobalt ferrite magnetic nanoparticle as a theranostic agent: MRI and hyperthermia
Conclusion The formation of multi-core MNPs by dextran coating is expected to improve the magnetic properties of the nanostructure, leading to optimization of theranostic parameters, so that CoFe2O4@Au@dextran NPs can create contrast-enhanced images more than three times the clinical use and require less contrast agent, reducing side effects. Accordingly, CoFe2O4@Au@dextran  can be introduced as a suitable theranostic nanostructure with optimal efficiency.Graphical abstract (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - March 6, 2023 Category: Materials Science Source Type: research

Multi T1-weighted contrast imaging and T1 mapping with compressed sensing FLAWS at 3  T
This study aims at reducing the FLAWS acquisition time by providing a new sequence optimization based on a Cartesian phyllotaxis k-space undersampling and a compressed sensing (CS) reconstruction. This study also aims at showing that T1 map ping can be performed with FLAWS at 3 T.Materials and methodsThe CS FLAWS parameters were determined using a method based on a profit function maximization under constraints. The FLAWS optimization and T1 mapping were assessed with in-silico, in-vitro and in-vivo (10 healthy volunteers) experiments conducted at 3  T.ResultsIn-silico, in-vitro and in-vivo experiments showed that the pr...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - February 27, 2023 Category: Materials Science Source Type: research

Celebrating 30  years of Magma’
(Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - February 27, 2023 Category: Materials Science Source Type: research