Two dimensional distribution measurement of electric current generated in a polymer electrolyte fuel cell using 49 NMR surface coils
In order to increase the current density generated in a PEFC (polymer electrolyte fuel cell), a method for measuring the spatial distribution of both the current and the water content of the MEA (membrane electrode assembly) is necessary. Based on the frequency shifts of NMR (nuclear magnetic resonance) signals acquired from the water contained in the MEA using 49 NMR coils in a 7 × 7 arrangement inserted in the PEFC, a method for measuring the two-dimensional spatial distribution of electric current generated in a unit cell with a power generation area of 140 mm × 160 mm was devised. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 17, 2018 Category: Radiology Authors: Kuniyasu Ogawa, Tatsuyoshi Sasaki, Shigeki Yoneda, Kumiko Tsujinaka, Ritsuko Asai Tags: Original contribution Source Type: research
Alterations in apparent diffusion coefficient values of the kidney during the cardiac cycle: Evaluation with ECG-triggered diffusion-weighted MR imaging
To evaluate dynamic changes in apparent diffusion coefficient (ADC) values of the kidney at different time points during the cardiac cycle using electrocardiographic (ECG)-triggered diffusion-weighted MR imaging in normal subjects, and to elucidate the differences in ADC values between the right and left kidneys during a cardiac cycle. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 17, 2018 Category: Radiology Authors: Katsuyoshi Ito, Minoru Hayashida, Akihiko Kanki, Akira Yamamoto, Tsutomu Tamada, Koji Yoshida, Masahiro Tanabe Tags: Original contribution Source Type: research
7 Tesla magnetic resonance imaging of caudal anterior cingulate and posterior cingulate cortex atrophy in patients with trigeminal neuralgia
The cingulate cortex (CC) is a brain region that plays a key role in pain processing, but CC abnormalities are not unclear in patients with trigeminal neuralgia (TN). The purpose of this study was to determine the central causal mechanisms of TN and the surrounding brain structure in healthy controls and patients with TN using 7 Tesla (T) magnetic resonance imaging (MRI). Whole-brain parcellation in gray matter volume and thickness was assessed in 15 patients with TN and 16 healthy controls matched for sex, age, and regional variability using T1-weighted imaging. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 17, 2018 Category: Radiology Authors: Hyeong Cheol Moon, Chan-A Park, Yeong-Jae Jeon, Soon Tae You, Hyun Man Baek, Youn Joo Lee, Chul Beom Cho, Chae Joon Cheong, Young Seok Park Tags: Original contribution Source Type: research
Effects of global signal regression and subtraction methods on resting-state functional connectivity using arterial spin labeling data
Arterial spin labeling (ASL) is an established magnetic resonance imaging (MRI) technique that is finding broader applications in functional studies of the healthy and diseased brain. To promote improvement in cerebral blood flow (CBF) signal specificity, many algorithms and imaging procedures, such as subtraction methods, were proposed to eliminate or, at least, minimize noise sources. Therefore, this study addressed the main considerations of how CBF functional connectivity (FC) is changed, regarding resting brain network (RBN) identification and correlations between regions of interest (ROI), by different subtraction me...
Source: Magnetic Resonance Imaging - May 17, 2018 Category: Radiology Authors: Jo ão Paulo Santos Silva, Luciana da Mata Mônaco, André Monteiro Paschoal, Ícaro Agenor Ferreira de Oliveira, Renata Ferranti Leoni Tags: Original contribution Source Type: research
Accuracy and precision of quantitative DCE-MRI parameters: How should one estimate contrast concentration?
Pharmacokinetic parameters derived from dynamic contrast-enhanced MRI (DCE-MRI) data are sensitive to acquisition and post-processing techniques, which makes it difficult to compare results obtained using different methods. In particular, one of the most important factors affecting estimation of model parameters is how to convert MRI signal intensities to contrast agent concentration. The purpose of our study was to quantitatively compare a linear signal-to-concentration conversion (LC) as an approximation and a non-linear conversion (NLC) based on the MRI signal equation, in terms of the accuracy and precision of the phar...
Source: Magnetic Resonance Imaging - May 17, 2018 Category: Radiology Authors: Nicole Wake, Hersh Chandarana, Henry Rusinek, Koji Fujimoto, Linda Moy, Daniel K. Sodickson, Sungheon Gene Kim Tags: Technical note Source Type: research
Regional cardiac function analysis from tagged MRI images. Comparison of techniques: Harmonic-Phase (HARP) versus Sinusoidal-Modeling (SinMod) analysis
In this study, we compared HARP and SinMod and studied inter-observer variability between the two techniques for evaluating myocardial strain and apical-to-base torsion in numerical phantom, nine healthy controls, and thirty diabetic patients. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 17, 2018 Category: Radiology Authors: El-Sayed H. Ibrahim, Jadranka Stojanovska, Azza Hassanein, Claire Duvernoy, Pierre Croisille, Rodica Pop-Busui, Scott D. Swanson Tags: Original contribution Source Type: research
Free-breathing ultrashort echo time lung magnetic resonance imaging using stack-of-spirals acquisition: A feasibility study in oncology patients
To investigate the diagnostic accuracy of lung magnetic resonance imaging (MRI) with a free-breathing three-dimensional ultrashort echo time spoiled gradient echo sequence using a stack-of-spirals acquisition (spiral 3D UTE) for pulmonary nodule detection at 3 T in oncology patients. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 15, 2018 Category: Radiology Authors: Min Jae Cha, Hyun Jeong Park, Mun Young Paek, Alto Stemmer, Eun Sun Lee, Sung Bin Park, Yang Soo Kim Tags: Original contribution Source Type: research
Phase matched RF pulse design for imaging a reduced field of excitation with a fast TSE acquisition
A method is described to design parallel transmit (PTX) excitation pulses that are compatible with turbo spin echo (TSE) sequences, based on information available from conventional per-channel B1+ mapping. The excitation phase of PTX pulses that generate a reduced field of excitation (rFOX) is matched to the phase the quadrature mode of a PTX coil. This enables TSE imaging of a PTX-enabled rFOX excitation combined with standard nonselective refocusing pulses transmitted in the quadrature mode. In-vivo imaging experiments were performed at 7T using a dual channel parallel transmit head coil. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 7, 2018 Category: Radiology Authors: Ronald Mooiweer, Alessandro Sbrizzi, Alexander J.E. Raaijmakers, Cornelis A.T. van den Berg, Peter R. Luijten, Hans Hoogduin Source Type: research
Intravoxel incoherent motion MRI-derived parameters and T2* relaxation time for noninvasive assessment of renal fibrosis: An experimental study in a rabbit model of unilateral ureter obstruction
To evaluate the association of apparent diffusion coefficient (ADC), intravoxel incoherent motion (IVIM) MRI-derived parameters, and T2* relaxation time with histopathological changes observed during renal fibrogenesis in a rabbit model of unilateral ureter obstruction (UUO). (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 5, 2018 Category: Radiology Authors: Sungmin Woo, Jeong Yeon Cho, Sang Youn Kim, Seung Hyup Kim Tags: Original contribution Source Type: research
Pancreatic stiffness response to an oral glucose load in obese adults measured by magnetic resonance elastography
To test the feasibility of magnetic resonance elastography (MRE) for assessing changes in pancreatic stiffness of obese adults administered an oral glucose load. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 3, 2018 Category: Radiology Authors: Ruoyun Ji, Jiahui Li, Ziying Yin, Yanqing Liu, Lizhuo Cang, Min Wang, Yu Shi Tags: Original contribution Source Type: research
Compressive sensing based on L1 and Hessian regularizations for MRI denoising
Compressive sensing can be used to reduce noise. However, some details also are sparsified. This paper presents a new denoising model based on compressive sensing with L1 and Hessian regularizations for magnetic resonance images denoising. Firstly, the proposed model can make an image more sparse through L1 regularization and reduce noise. Secondly, Hessian regularization is introduced to protect some details from being over-smoothed. Experimental results demonstrate that the proposed method is efficient, and has better denoising capability. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 2, 2018 Category: Radiology Authors: Jianjun Yuan, Jianjun Wang Source Type: research
Amide proton transfer imaging can predict tumor grade in rectal cancer
To prospectively investigate the ability of amide proton transfer (APT) imaging, in comparison with that of diffusion-weighted imaging (DWI), to predict pathological factors in rectal cancer. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 2, 2018 Category: Radiology Authors: Akihiro Nishie, Yukihisa Takayama, Yoshiki Asayama, Kousei Ishigami, Yasuhiro Ushijima, Daisuke Okamoto, Nobuhiro Fujita, Daisuke Tsurumaru, Osamu Togao, Tatsuya Manabe, Eiji Oki, Yuichiro Kubo, Tomoyuki Hida, Minako Hirahashi-Fujiwara, Jochen Keupp, Hiro Tags: Original contribution Source Type: research
Influence of k-space trajectory corrections on proton density mapping with ultrashort echo time imaging: Application for imaging of short T2 components in white matter
To evaluate the impact of MR gradient system imperfections and limitations for the quantitative mapping of short T2* signals performed by ultrashort echo time (UTE) acquisition approach. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 2, 2018 Category: Radiology Authors: Peter Latta, Zenon Star čuk, Marco L.H. Gruwel, Barbora Lattova, Petra Lattova, Pavel Štourač, Boguslaw Tomanek Tags: Original contribution Source Type: research
Editorial Board
(Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 1, 2018 Category: Radiology Source Type: research
Dynamic contrast-enhanced MRI of orbital and anterior visual pathway lesions
The accurate diagnosis of orbital and anterior visual pathway lesions has clinical significance. We determined whether dynamic contrast-enhanced MRI could differentiate benign from malignant lesions and compared model-independent and model-dependent methods of data analysis. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 27, 2018 Category: Radiology Authors: Nutchawan Jittapiromsak, Ping Hou, Ho-Ling Liu, Jia Sun, Jade S. Schiffman, T. Linda Chi Tags: Original contribution Source Type: research
