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
A new discrete dipole kernel for quantitative susceptibility mapping
Most approaches for quantitative susceptibility mapping (QSM) are based on a forward model approximation that employs a continuous Fourier transform operator to solve a differential equation system. Such formulation, however, is prone to high-frequency aliasing. The aim of this study was to reduce such errors using an alternative dipole kernel formulation based on the discrete Fourier transform and discrete operators. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 16, 2018 Category: Radiology Authors: Carlos Milovic, Julio Acosta-Cabronero, Jos é Miguel Pinto, Hendrik Mattern, Marcelo Andia, Sergio Uribe, Cristian Tejos Tags: Technical note Source Type: research
Anisotropy of anomalous diffusion improves the accuracy of differentiating low- and high-grade cerebral gliomas
Anomalous diffusion model has been introduced and shown to be beneficial in clinical applications. However, only the directionally averaged values of anomalous diffusion parameters were investigated, and the anisotropy of anomalous diffusion remains unexplored. The aim of this study was to demonstrate the feasibility of using anisotropy of anomalous diffusion for differentiating low- and high-grade cerebral gliomas. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 16, 2018 Category: Radiology Authors: Boyan Xu, Lu Su, Zhenxiong Wang, Yang Fan, Gaolang Gong, Wenzhen Zhu, Peiyi Gao, Jia-Hong Gao Tags: Original contribution Source Type: research
Detection of high GS risk group prostate tumors by diffusion tensor imaging and logistic regression modelling
To assess the value of joint evaluation of diffusion tensor imaging (DTI) measures by using logistic regression modelling to detect high GS risk group prostate tumors. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 9, 2018 Category: Radiology Authors: Gokhan Ertas Tags: Original contribution Source Type: research
Editorial Board
(Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 5, 2018 Category: Radiology Source Type: research
Effect of cardiac-related translational motion in diffusion MRI of the spinal cord
Cardiac-related spinal cord motion affects diffusion-weighted (DWI) signal. The goal of this study was to further quantify the specific detrimental effect of cord translational motion on the DWI signal in order to make better informed decisions about the cost-benefit of cardiac gating.We designed an MRI-compatible phantom mimicking the spinal cord translational motion. Cardiac-gated DWI data were acquired by varying the trigger delay and the b-values. Evaluation of the effect of motion on the DWI signal was done by computing the apparent diffusion coefficient (ADC) along (z-direction) and orthogonal (y- and x-directions) t...
Source: Magnetic Resonance Imaging - April 4, 2018 Category: Radiology Authors: Darya Morozov, Nibardo Lopez Rios, Tanguy Duval, Alexandru Foias, Julien Cohen-Adad Tags: Technical note Source Type: research
eIRIS: Eigen-analysis approach for improved spine multi-shot diffusion MRI
Image reconstruction using image-space sampling function (IRIS) corrects motion-induced inter-shot phase variations using phase maps from navigator-echo for multi-shot diffusion MRI. However, the bandwidth along the phase-encoding direction of navigator-echo is usually lower than that of image-echo, and thus their geometric distortions may be different. This geometric mismatch is corrected in IRIS by using the B0 map from an additional scan. In this paper, we present an enhanced IRIS (eIRIS) method that remove the requirement of B0 map. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 4, 2018 Category: Radiology Authors: Li Guo, Feng Huang, Zhongbiao Xu, Yingjie Mei, Wenxing Fang, Xiaodong Ma, Erpeng Dai, Hua Guo, Qianjin Feng, Wufan Chen, Yanqiu Feng Tags: Technical note Source Type: research
Effect of cardiac-related translational motion in diffusion MRI of the spinal cord
Cardiac-related spinal cord motion affects diffusion-weighted (DWI) signal. The goal of this study was to further quantify the specific detrimental effect of cord translational motion on the DWI signal in order to make better informed decisions about the cost-benefit of cardiac gating.We designed an MRI-compatible phantom mimicking the spinal cord translational motion. Cardiac-gated DWI data were acquired by varying the trigger delay and the b-values. Evaluation of the effect of motion on the DWI signal was done by computing the apparent diffusion coefficient (ADC) along (z-direction) and orthogonal (y- and x-directions) t...
Source: Magnetic Resonance Imaging - April 4, 2018 Category: Radiology Authors: Darya Morozov, Nibardo Lopez Rios, Tanguy Duval, Alexandru Foias, Julien Cohen-Adad Tags: Technical note Source Type: research
eIRIS: Eigen-analysis approach for improved spine multi-shot diffusion MRI
Image reconstruction using image-space sampling function (IRIS) corrects motion-induced inter-shot phase variations using phase maps from navigator-echo for multi-shot diffusion MRI. However, the bandwidth along the phase-encoding direction of navigator-echo is usually lower than that of image-echo, and thus their geometric distortions may be different. This geometric mismatch is corrected in IRIS by using the B0 map from an additional scan. In this paper, we present an enhanced IRIS (eIRIS) method that remove the requirement of B0 map. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - April 4, 2018 Category: Radiology Authors: Li Guo, Feng Huang, Zhongbiao Xu, Yingjie Mei, Wenxing Fang, Xiaodong Ma, Erpeng Dai, Hua Guo, Qianjin Feng, Wufan Chen, Yanqiu Feng Tags: Technical note Source Type: research
Measurement of fat fraction in the human thymus by localized NMR and three-point Dixon MRI techniques
To develop a protocol to non-invasively measure and map fat fraction, fat/(fat+water), as a function of age in the adult thymus for future studies monitoring the effects of interventions aimed at promoting thymic rejuvenation and preservation of immunity in older adults. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - March 29, 2018 Category: Radiology Authors: Kenneth W. Fishbein, Sokratis K. Makrogiannis, Vanessa A. Lukas, Marilyn Okine, Ramona Ramachandran, Luigi Ferrucci, Josephine M. Egan, Chee W. Chia, Richard G. Spencer Tags: Original contribution Source Type: research
Water-fat separation incorporating spatial smoothing is robust to noise
To develop and evaluate a noise-robust method for reconstruction of water and fat images for spoiled gradient multi-echo sequences. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - March 27, 2018 Category: Radiology Authors: Jonathan Andersson, H åkan Ahlström, Joel Kullberg Tags: Original contribution Source Type: research
Radiofrequency properties of two different Licox ® parenchymal brain tissue oxygen probe designs
Neuroimaging and continuous multimodality neuromonitoring are both central to the intensive care management of patients with severe traumatic brain injury [1]. Guidelines recommend the use of multimodality monitors including brain tissue oxygen (PbtO2) sensors to assess the adequacy of cerebral oxygen delivery [2]. Devices such as the Licox® sensor (Integra LifeSciences, Plainsboro, NJ) employ a miniature implantable electrochemical cell. Temperat ure compensation is essential for accurate measurements and the device is now available with an integrated temperature sensor (Model CC1P1)[3]. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - March 16, 2018 Category: Radiology Authors: Ari Ercole Source Type: research
