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Will standardization kill innovation?
(Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - August 26, 2023 Category: Materials Science Source Type: research

Optimal bi-planar gradient coil configurations for diamond nitrogen-vacancy based diffusion-weighted NMR experiments
DiscussionWe found that the chosen relative bi-planar tilt of\(35^{\circ }\) represents a reasonable compromise in terms of overall performance and allows for easier coil implementation with a straight, horizontal alignment within the overall experimental setup. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - August 14, 2023 Category: Materials Science Source Type: research

A new method to improve RF safety of implantable medical devices using inductive coupling at 3.0  T MRI
ConclusionA novel method employing the designed SR, which generates opposing magnetic fields to partially shield a sample, has been proposed to mitigate the risk of induced-RF heating at theVoI through numerical simulations and corresponding experiments under various conditions at 3.0  T. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - August 11, 2023 Category: Materials Science Source Type: research

Streamlined quantitative BOLD for detecting visual stimulus-induced changes in oxygen extraction fraction in healthy participants: toward clinical application in human glioma
ConclusionThe sqBOLD technique is sensitive enough to detect and quantify changes in oxygenation in the healthy brain and shows potential for integration into clinical settings to provide valuable information on oxygenation in glioma. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - August 9, 2023 Category: Materials Science Source Type: research

The impact of pre-processing and disease characteristics on reproducibility of T2-weighted MRI radiomics features
ConclusionThe reproducibility of T2WI radiomics features was significantly influenced by pre-processing parameters, but not by disease characteristics. The selected pre-processing setting yielded 25 reproducible features. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - August 9, 2023 Category: Materials Science Source Type: research

Exploring the foothills: benefits below 1 Tesla?
(Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - July 24, 2023 Category: Materials Science Source Type: research

Repeatability and reproducibility of apparent exchange rate measurements in yeast cell phantoms using filter-exchange imaging
ConclusionsUsing ice –water and yeast cell-based phantoms, a protocol for the validation of FEXI pulse sequences was established for the assessment of stability, repeatability, reproducibility and directionality. In addition, a strong dependence of AXR on cell density and temperature was shown. As AXR is an emerging n ovel imaging biomarker, the suggested protocol will be useful for quality assurance of AXR measurements within a study and potentially across multiple sites. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - July 12, 2023 Category: Materials Science Source Type: research

High-field magnetic resonance microscopy of aortic plaques in a mouse model of atherosclerosis
We describe an ex-vivo, high-resolution MRI method that allows the 3 dimensional imaging of the vessel for aortic plaque visualization and quantification.Materials and methodsAortas from apolipoprotein-E-deficient (apoE−/−) mice fed an atherogenic diet (group 1) or a control diet (group 2) were subjected to 14  T MR imaging using a 3D gradient echo sequence. The obtained data sets were reconstructed (Matlab), segmented, and analyzed (Avizo). The aortas were further sectioned and subjected to traditional histological analysis (Oil-Red O and hematoxylin staining) for comparison.ResultsA resolution up to 15  × 10x10...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - July 8, 2023 Category: Materials Science Source Type: research

Arterial occlusion duration affects the cuff-induced hyperemic response in skeletal muscle BOLD perfusion imaging as shown in young healthy subjects
The objective was to explore the robustness of this technique and its sensitivity to the occlusion duration.Materials and methodsBOLD images were acquired at 3  T in 14 healthy volunteers.\({\mathrm{T}}_{2}^{*}\)-imaging with 5- and 1.5-min occlusions were acquired and several semi-quantitative BOLD parameters were derived from ROI-based\({\mathrm{T}}_{2}^{*}\)-time curves. Differences in parameters from the two different occlusion durations were evaluated in the gastrocnemius and soleus muscles using non-parametrical tests. Intra- and inter-scan repeatability were evaluated with coefficient of variation.ResultsLonger occ...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - June 17, 2023 Category: Materials Science Source Type: research

Concomitant field compensation of spiral turbo spin-echo at 0.55  T
DiscussionWe demonstrated a generalizable approach to mitigate concomitant field artifacts for spiral TSE acquisitions via the addition of quadratic-nulling gradients, which can potentially improve neuroimaging at low-field through increased acquisition efficiency. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - June 12, 2023 Category: Materials Science Source Type: research

Automated inversion time selection for black-blood late gadolinium enhancement cardiac imaging in clinical practice
DiscussionThanks to its good performance and simplicity of implementation, the proposed algorithm is a good candidate for automated BL-LGE imaging in clinical practice. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - June 9, 2023 Category: Materials Science Source Type: research

An evolution of low-field strength MRI
AbstractThe paper describes the evolution of low-field MRI from the very early pioneering days in the late 70  s until today. It is not meant to give a comprehensive historical account of the development of MRI, but rather to highlight the different research environments then and now. In the early 90 s, when low-field systems below 1.5 T essentially vanished, there were just no reasonable means available to make up for the factor of roughly three in signal-to-noise-ratio (SNR) between 0.5 and 1.5 T. This has drastically changed. Improvements in hardware—closed Helium-free magnets, RF receiver systems and especially m...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - June 8, 2023 Category: Materials Science Source Type: research

An integrated target field framework for point-of-care halbach array low-field MRI system design
DiscussionThe framework allows the designer to optimize the different hardware components with respect to the desired imaging parameters taking into account the interdependencies between these components and thus give insight into the influence of the design choices. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - May 20, 2023 Category: Materials Science Source Type: research

Relaxation measurements of an MRI system phantom at low magnetic field strengths
DiscussionThe low field relaxation rates of the NiCl2 and MnCl2 arrays in the ISMRM/NIST system phantom are investigated and compared to results from clinical field strengths of 1.5  T and 3.0 T. The measurements can be used as a benchmark for MRI system functionality and stability, especially when MRI systems are taken out of the radiology suite or laboratory and into less traditional environments. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - May 20, 2023 Category: Materials Science Source Type: research

In vivo quantitative MRI: T1 and T2 measurements of the human brain at 0.064  T
Discussion\({T}_{1}\) and\({T}_{2}\) times for brain tissue were measured at 0.064  T. Test samples demonstrated accuracy in WM and GM ranges of values but underestimated long\({T}_{2}\) in the CSF range. This work contributes to measuring quantitative MRI properties of the human body at a range of field strengths. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - May 20, 2023 Category: Materials Science Source Type: research