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Characterizing geometric distortions of 3D sequences in clinical head MRI
ConclusionPresented results emphasize the sensitivity of the geometric accuracy to positioning and imaging parameters. Phantom limitations may become an issue with some sequence types, encouraging the use of anatomical images for evaluating the geometric accuracy. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - June 3, 2022 Category: Materials Science Source Type: research

High-permittivity pads to enhance SNR and transmit efficiency in MRI of the heart at 7T: a simulation study
AbstractObjectiveHigh-permittivity pads have shown promising results in enhancing SNR and transmit efficiency when used for MRI of the brain, but fewer studies have been conducted to examine the performance of high-permittivity pads in other parts of the patient. In this work, we evaluate the impact on SNR and transmit efficiency distributions when high-permittivity pads with different thickness are positioned near the chest of the patient in combination with a transmit/receive array coil.MethodsThe performance of the pads is evaluated through numerical simulations, and both the SNR distribution and the transmit efficiency...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - May 31, 2022 Category: Materials Science Source Type: research

PI-RADS: multiparametric MRI in prostate cancer
AbstractMultiparametric MRI of the prostate gland has become the initial evaluation of biopsy na ïve men with a clinical suspicion for prostate cancer. PI-RADS 2.1 is a joint initiative and framework for prostate MRI acquisition and reporting, which aims to standardize technique and interpretation across centers. Building upon experience accrued following the introduction of PI-RADS 2.0, versi on 2.1 provides key updates and important clarifications, although it is intended to be an active document, which continues to be updated. Continued advances in our understanding of prostate cancer and progress in imaging technology...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - May 21, 2022 Category: Materials Science Source Type: research

Right ventricular strain and volume analyses through deep learning-based fully automatic segmentation based on radial long-axis reconstruction of short-axis cine magnetic resonance images
DiscussionOur proposed RLA realizes accurate fully automatic extraction of the entire RV region from an available CMR cine image without any additional imaging. Our findings overcome the complexity of image analysis in CMR without the limitations of the RV visualization in echocardiography. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - May 18, 2022 Category: Materials Science Source Type: research

Ultra-high-field MR in Prostate cancer: Feasibility and Potential
AbstractMultiparametric MRI of the prostate at clinical magnetic field strengths (1.5/3 Tesla) has emerged as a reliable noninvasive imaging modality for identifying clinically significant cancer, enabling selective sampling of high-risk regions with MRI-targeted biopsies, and enabling minimally invasive focal treatment options. With increased sensitivity and spectral resolution, ultra-high-field (UHF) MRI ( ≥ 7 Tesla) holds the promise of imaging and spectroscopy of the prostate with unprecedented detail. However, exploiting the advantages of ultra-high magnetic field is challenging due to inhomogeneity of the radiofr...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - May 17, 2022 Category: Materials Science Source Type: research

Can magnetisation transfer magnetic resonance imaging help for the follow-up of synthetic hernia composite meshes fate? A pilot study
ConclusionsMagnetization transfer imaging allows to detect mesh integration and, associated with pneumoperitoneum, was able to probe the effective minimizing effect of the synthetic polymeric barrier on visceral attachments. However, magnetization transfer imaging could not unambiguously allow the visualization of the mesh through the polymeric barrier. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - May 13, 2022 Category: Materials Science Source Type: research

Improving brain B0 shimming using an easy and accessible multi-coil shim array at ultra-high field
DiscussionThe designed eight-channel shim array provides a low-complexity and low-cost approach for improving B0 field shimming on an ultra-high field system. In both static and dynamic shimming, it provides improved B0 homogeneity over standard shimming. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - May 5, 2022 Category: Materials Science Source Type: research

Novel materials in magnetic resonance imaging: high permittivity ceramics, metamaterials, metasurfaces and artificial dielectrics
This article reviews recent developments in designing and testing new types of materials which can be: (i) placed around the body for in vivo imaging, (ii) be integrated into a conventional RF coil, or (iii) form the resonator itself. These materials can improve the quality of MRI scans for both in vivo and magnetic resonance microscopy applications. The methodological section covers the basic operation and design of two different types of materials, namely high permittivity materials constructed from ceramics and artificial dielectrics/metasurfaces formed by coupled conductive subunits, either in air or surrounded by diel...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 26, 2022 Category: Materials Science Source Type: research

Can detonation nanodiamonds serve as MRI phantoms?
(Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 26, 2022 Category: Materials Science Source Type: research

Developments in proton MR spectroscopic imaging of prostate cancer
AbstractIn this paper, we review the developments of1H-MR spectroscopic imaging (MRSI) methods designed to investigate prostate cancer, covering key aspects such as specific hardware, dedicated pulse sequences for data acquisition and data processing and quantification techniques. Emphasis is given to recent advancements in MRSI methodologies, as well as future developments, which can lead to overcome difficulties associated with commonly employed MRSI approaches applied in clinical routine. This includes the replacement of standard PRESS sequences for volume selection, which we identified as inadequate for clinical applic...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 20, 2022 Category: Materials Science Source Type: research

T2* assessment of the three coronary artery territories of the left ventricular wall by different monoexponential truncation methods
ConclusionClear T2* differentiation between the three coronary territories by the two truncation methods is demonstrated. The two truncation methods can be used interchangeably in classifying severe and moderate iron deposition at the recommended septal region. However, in patients with low iron indication, different results by the two truncation methods can mislead the investigation of early iron level progression. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 18, 2022 Category: Materials Science Source Type: research

MR fingerprinting of the prostate
AbstractMultiparametric magnetic resonance imaging (mpMRI) has been adopted as the key tool for detection, localization, characterization, and risk stratification of patients suspected to have prostate cancer. Despite advantages over systematic biopsy, the interpretation of prostate mpMRI has limitations including a steep learning curve, leading to considerable interobserver variation. There is growing interest in clinical translation of quantitative imaging techniques for more objective lesion assessment. However, traditional mapping techniques are slow, precluding their use in the clinic. Magnetic resonance fingerprintin...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 13, 2022 Category: Materials Science Source Type: research

Determination of oxygen relaxivity in oxygen nanobubbles at 3 and 7  Tesla
ConclusionThis suggests thatT1 mapping could provide a noninvasive method of measuring a  >  100 mmHg oxygen delivery from therapeutic nanobubbles. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 13, 2022 Category: Materials Science Source Type: research

Clinical application of single-shot echo-planar diffusion-weighted imaging with compressed SENSE in prostate MRI at 3T: preliminary experience
ConclusionCompared with EPIS, EPICS has improved IQ and comparable diagnostic performance in PC. (Source: Magnetic Resonance Materials in Physics, Biology and Medicine)
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - April 11, 2022 Category: Materials Science Source Type: research

High resolution magic angle spinning MRS in prostate cancer
AbstractIntroductionProstate cancer (PCa) is one of the leading causes of death among men worldwide. The current methods utilized to screen for prostate cancer may not have sufficient sensitivity in distinguishing aggressive from indolent diseases, which affect the quality of life of patients in the short and long term. The overdiagnosis of cases and overtreatment are prevalent due to the heterogeneity of the disease in terms of latent and progressive variants, as well as in the tissue types present in biopsy samples.MethodsThe purpose of this review is to discuss the potential clinical benefits of incorporating high-resol...
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - March 22, 2022 Category: Materials Science Source Type: research