Editorial Board
(Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 26, 2018 Category: Radiology Source Type: research
Identification of an optimal threshold for detecting human brown adipose tissue using receiver operating characteristic analysis of IDEAL MRI fat fraction maps
Lower fat fraction (FF) in brown adipose tissue (BAT) than white adipose tissue (WAT) has been exploited using Dixon-based Magnetic Resonance Imaging (MRI) to differentiate these tissues in rodents, human infants and adults. We aimed to determine whether an optimal FF threshold could be determined to differentiate between BAT and WAT in adult humans in vivo. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 25, 2018 Category: Radiology Authors: Terence A. Jones, Sarah C. Wayte, Narendra L. Reddy, Oludolapo Adesanya, George K. Dimitriadis, Thomas M. Barber, Charles E. Hutchinson Source Type: research
Oral carcinoma: Clinical evaluation using diffusion kurtosis imaging and its correlation with histopathologic findings
In this study, we aimed to determine the usefulness of diffusion kurtosis imaging (DKI) as a noninvasive method for evaluation of the histologic grade and lymph node metastasis in patients with oral carcinoma. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 25, 2018 Category: Radiology Authors: Ichiro Yamada, Norio Yoshino, Keigo Hikishima, Junichiro Sakamoto, Misaki Yokokawa, Yu Oikawa, Hiroyuki Harada, Tohru Kurabayashi, Yukihisa Saida, Ukihide Tateishi, Akane Yukimori, Toshiyuki Izumo, Shun Asahina Tags: Original contribution Source Type: research
FoCA: A new framework of coupled geometric active contours for segmentation of 3D cardiac magnetic resonance images
In this paper, a new framework of coupled active contours (FoCA) is proposed for segmentation of the left ventricle myocardium, in cardiac magnetic resonance (CMR) images, without primary learning and user-driven segmentation. Primarily, we suggest a pair of coupled geometric active contours (GACs) for segmentation of the endo- and epicardial boundaries of the left ventricle in every CMR slice. The energy functional of each active contour includes the edge and shape terms of the STACS energy functional, regulator term of the local binary fitting (LBF), and new region and coupling terms. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 23, 2018 Category: Radiology Authors: Mohammad-Bagher Khamechian, Mahdi Saadatmand-Tarzjan Tags: Original contribution Source Type: research
Effect of echo time and T2-weighting on GRASE-based T1w/T2w ratio measurements at 3T
Tissue contrast can be enhanced by dividing T1-weighted (T1w) images by T2-weighted (T2w) images to map the so-called T1w/T2w ratio, which has become an increasingly popular technique for quantifying brain tissue changes associated with neurodevelopment, aging, and a variety of neurodegenerative diseases. However, although it is self-evident that T1w/T2w ratios increase with the amount of T2-weighting in the T2w image – which is determined by the echo time (TE), all else being equal – longer TEs also reduce the signal-to-noise ratio (SNR) of the T2w images, and it is not clear how these SNR characteristics affect the r...
Source: Magnetic Resonance Imaging - April 19, 2018 Category: Radiology Authors: Md Nasir Uddin, Teresa D. Figley, Chase R. Figley Tags: Original contribution Source Type: research
A multi-purpose electromagnetic actuator for magnetic resonance elastography
An electromagnetic actuator was designed for magnetic resonance elastography (MRE). The actuator is unique in that it is simple, portable, and capable of brain, abdomen, and phantom imagings. A custom-built control unit was used for controlling the vibration frequency and synchronizing the trigger signals. An actuation unit was built and mounted on the specifically designed clamp and holders for different imaging applications. MRE experiments with respect to gel phantoms, brain, and liver showed that the actuator could produce stable and consistent mechanical waves. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 18, 2018 Category: Radiology Authors: Yuan Feng, Mo Zhu, Suhao Qiu, Ping Shen, Shengyuan Ma, Xuefeng Zhao, Chun-hong Hu, Liang Guo Tags: Original contribution Source Type: research
Ex vivo mouse brain microscopy at 15T with loop-gap RF coil
The design of a loop-gap-resonator RF coil optimized for ex vivo mouse brain microscopy at ultra high fields is described and its properties characterized using simulations, phantoms and experimental scans of mouse brains fixed in 10% formalin containing 4 mM Magnevist™. The RF (B1) and magnetic field (B0) homogeneities are experimentally quantified and compared to electromagnetic simulations of the coil. The coil's performance is also compared to a similarly sized surface coil and found to yield double the sensitivity. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 18, 2018 Category: Radiology Authors: Ouri Cohen, Jerome L. Ackerman Source Type: research
Quantitative diffusion MRI using reduced field-of-view and multi-shot acquisition techniques: Validation in phantoms and prostate imaging
To evaluate the reproducibility of quantitative diffusion measurements obtained with reduced Field of View (rFOV) and Multi-shot EPI (msEPI) acquisitions, using single-shot EPI (ssEPI) as a reference. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 17, 2018 Category: Radiology Authors: Yuxin Zhang, James Holmes, I ñaki Rabanillo, Arnaud Guidon, Shane Wells, Diego Hernando Source Type: research
Effect of intravascular contrast agent on diffusion and perfusion fraction coefficients in the peripheral zone and prostate cancer
To determine whether water diffusion and the perfusion fraction coefficients in prostate peripheral zone (PZ) and prostate cancer (PCa) are affected by intravenous contrast injection and explore the potential mechanism behind previously reported differences between pre- and post-contrast ADC values. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 17, 2018 Category: Radiology Authors: Yousef Mazaheri, Andreas M. H ötker, Amita Shukla-Dave, Oguz Akin, Hedvig Hricak Source Type: research
B1 − non-uniformity correction of phased-array coils without measuring coil sensitivity
Parallel imaging can be used to increase SNR and shorten acquisition times, albeit, at the cost of image non-uniformity. B1 − non-uniformity correction techniques are confounded by signal that varies not only due to coil induced B1− sensitivity variation, but also the object's own intrinsic signal. Herein, we propose a method that makes minimal assumptions and uses only the coil images themselves to produce a single combined B1− non-uniformity-corrected complex image with the highest available SNR. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 17, 2018 Category: Radiology Authors: Frederick C. Damen, Kejia Caic Tags: Original contribution Source Type: research
Quantitative diffusion MRI using reduced field-of-view and multi-shot acquisition techniques: Validation in phantoms and prostate imaging
To evaluate the reproducibility of quantitative diffusion measurements obtained with reduced Field of View (rFOV) and Multi-shot EPI (msEPI) acquisitions, using single-shot EPI (ssEPI) as a reference. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 17, 2018 Category: Radiology Authors: Yuxin Zhang, James Holmes, I ñaki Rabanillo, Arnaud Guidon, Shane Wells, Diego Hernando Source Type: research
Effect of intravascular contrast agent on diffusion and perfusion fraction coefficients in the peripheral zone and prostate cancer
To determine whether water diffusion and the perfusion fraction coefficients in prostate peripheral zone (PZ) and prostate cancer (PCa) are affected by intravenous contrast injection and explore the potential mechanism behind previously reported differences between pre- and post-contrast ADC values. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 17, 2018 Category: Radiology Authors: Yousef Mazaheri, Andreas M. H ötker, Amita Shukla-Dave, Oguz Akin, Hedvig Hricak Source Type: research
