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Image distortion correction for MRI in low field permanent magnet systems with strong B 0 inhomogeneity and gradient field nonlinearities
DiscussionIn case of\({B}_{0}\) inhomogeneities in the order of kHz, iterative MB reconstructions can help to improve both image quality and\(\Delta {B}_{0}\) map estimation. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - January 27, 2021 Category: Materials Science Source Type: research

3D magnetization transfer (MT) for the visualization of cardiac free-running Purkinje fibers: an ex vivo proof of concept
DiscussionMT significantly improves contrast between PFs and ventricular myocardium and appears promising for imaging the 3D architecture of the Purkinje network. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - January 23, 2021 Category: Materials Science Source Type: research

A physical phantom for amine chemical exchange saturation transfer (CEST) MRI
DiscussionWe designed a physical phantom for amine CEST-MRI, which is easy to assemble and transfer, holds 18 different solutions, and has excellent short-term chemical and MRI stability. We believe this robust phantom will facilitate the development of novel sequences and cross-scanners validations. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - January 23, 2021 Category: Materials Science Source Type: research

Impact of the acquisition protocol on the sensitivity to demyelination and axonal loss of clinically feasible DWI techniques: a simulation study
DiscussionThis work is expected to impact future choices for investigating white matter microstructure in focusing on specific stages of the disease, and for selecting the appropriate experimental framework to obtain optimal data quality given the purpose of the experiment. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - January 8, 2021 Category: Materials Science Source Type: research

A new technique to evaluate the impact of running on knee cartilage deformation by region
The objectives of this investigation were: (1) use statistical parametric mapping (SPM) to determine regional deformation patterns of tibiofemoral cartilage in response to running; (2) quantify regional differences in cartilage thickness between males and females; and (3) explore the influence of sex on deformation.Materials and methodsAsymptomatic males (n = 15) and females (n = 15) had MRI imaging of their right knee before and after 15 min of treadmill running. Medial and lateral tibial, and medial and lateral weight-bearing femoral cartilage were segmented. SPM was completed on cartilage thickness maps to test...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - January 2, 2021 Category: Materials Science Source Type: research

Integrated slice-specific dynamic shimming for whole-body diffusion-weighted MR imaging at 1.5  T
ConclusioniShim reduced the degree of spinal cord displacement artefact between imaging stations and susceptibility-gradient-induced signal loss. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - December 23, 2020 Category: Materials Science Source Type: research

Simulated basis sets for semi-LASER: the impact of including shaped RF pulses and magnetic field gradients
DiscussionThe inclusion of the shaped RF pulses and magnetic field gradients in the simulation of basis sets for semi-LASER is only important for strongly coupled metabolites. If computational time is a limiting factor, simple simulations with hard RF pulses can provide almost as accurate metabolite quantification as those that include the chemical-shift related displacement. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - December 23, 2020 Category: Materials Science Source Type: research

Comparing multiband and singleband EPI in NODDI at 3  T: what are the implications for reproducibility and study sample sizes?
ConclusionsBoth SB and MB yield highly reproducible NDI and ODI measures, but direct comparison of these parameters between methods is complicated by systematic differences that exist between the two approaches. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - December 14, 2020 Category: Materials Science Source Type: research

Feasibility of quantitative susceptibility mapping (QSM) of the human kidney
ConclusionQSM of the human kidney could be a promising approach for the assessment of information about microscopic renal tissue structure. Therefore, it might further improve functional renal MR imaging. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - November 24, 2020 Category: Materials Science Source Type: research

Hyperpolarization via dissolution dynamic nuclear polarization: new technological and methodological advances
AbstractDissolution-DNP is a method to boost liquid-state NMR sensitivity by several orders of magnitude. The technique consists in hyperpolarizing samples by solid-state dynamic nuclear polarization at low temperature and moderate magnetic field, followed by an instantaneous melting and dilution of the sample happening inside the polarizer. Although the technique is well established and the outstanding signal enhancement paved the way towards many applications precluded to conventional NMR, the race to develop new methods allowing higher throughput, faster and higher polarization, and longer exploitation of the signal is ...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - November 13, 2020 Category: Materials Science Source Type: research

Can sodium MRI be used as a method for mapping of cartilage stiffness?
Discussion and conclusionAlthough there was correlation between GAG concentration and cartilage stiffness, this was not similar with sodium concentration as measured by MRI. Thus, if the correlation between MRI sodium imaging and GAG concentration could be resolved, this strategy for assessing cartilage functional quality still holds promise. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - November 12, 2020 Category: Materials Science Source Type: research

A radiomics pipeline dedicated to Breast MRI: validation on a multi-scanner phantom study
DiscussionA dedicated standardisation pipeline was developed to reduce variabilities in breast MRI, which paves the way for robust multi-scanner radiomic studies but needs to be assessed on patient data. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - November 12, 2020 Category: Materials Science Source Type: research

15 Years MR-encephalography
DiscussionMREG has been developed to push the speed limits of fMRI. Compared to multiband-EPI this allows considerably faster acquisition at the cost of reduced image quality and spatial resolution. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - October 20, 2020 Category: Materials Science Source Type: research

Comparison of 2D simultaneous multi-slice and 3D GRASE readout schemes for pseudo-continuous arterial spin labeling of cerebral perfusion at 3 T
DiscussionOur study demonstrates that the accelerated SMS readout can provide increased acquisition efficiency and/or a higher temporal resolution than conventional 2D and 3D readout sequences. Among all of the methods, 3D-GRASE showed the lowest variability in CBF measurements and thus highest robustness against noise. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - October 13, 2020 Category: Materials Science Source Type: research

Accuracy and longitudinal reproducibility of quantitative femorotibial cartilage measures derived from automated U-Net-based segmentation of two different MRI contrasts: data from the osteoarthritis initiative healthy reference cohort
DiscussionThe 2D U-Net-based automated segmentation method yielded high agreement compared with manual segmentation and also demonstrated high accuracy and longitudinal test –retest reproducibility for morphometric analysis of articular cartilage derived from it, using both corFLASH and sagDESS. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - October 5, 2020 Category: Materials Science Source Type: research