Influence of arterial input function (AIF) on quantitative prostate dynamic contrast-enhanced (DCE) MRI and zonal prostate anatomy
This study analyzes the influence of the method of AIF determination on quantitative DCE-MRI. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - June 11, 2018 Category: Radiology Authors: F. Ziayee, A. M üller-Lutz, J. Gross, M. Quentin, T. Ullrich, P. Heusch, C. Arsov, R. Rabenalt, P. Albers, G. Antoch, H.J. Wittsack, L. Schimmöller Tags: Original contribution Source Type: research
Frequency-modulated bSSFP for phase-sensitive separation of water and fat
Our study proposes the use of a frequency-modulated acquisition which suppresses banding artefacts in combination with a phase-sensitive water-fat separation algorithm.The performance of the phase-sensitive separation for standard bSSFP, complex sum combination thereof, and frequency-modulated bSSFP were compared in in vivo measurements of the upper and lower legs at 1.5 and 3 T. It is shown, that the standard acquisition suffered from banding artefacts and major swaps between tissues. The dual-acquisition bSSFP could alleviate banding artefacts and only minor swaps occurred, but it comes at the expense of a doubled acquis...
Source: Magnetic Resonance Imaging - June 11, 2018 Category: Radiology Authors: Anne Slawig, Tobias Wech, Valentin Ratz, Henning Neubauer, Thorsten Bley, Herbert K östler Source Type: research
Background field removal technique based on non-regularized variable kernels sophisticated harmonic artifact reduction for phase data for quantitative susceptibility mapping
We developed a non-regularized, variable kernel, sophisticated harmonic artifact reduction for phase data (NR-VSHARP) method to accurately estimate local tissue fields without regularization for quantitative susceptibility mapping (QSM). We then used a digital brain phantom to evaluate the accuracy of the NR-VSHARP method, and compared it with the VSHARP and iterative spherical mean value (iSMV) methods through in vivo human brain experiments. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - June 11, 2018 Category: Radiology Authors: Hirohito Kan, Nobuyuki Arai, Masahiro Takizawa, Kazuyoshi Omori, Harumasa Kasai, Hiroshi Kunitomo, Yasujiro Hirose, Yuta Shibamoto Source Type: research
Pre- and post-surgery MRSI predictive value in adult oligodendroglioma prognosis
The aim of this study was to study the relationship between MRSI, before and after surgery, and patient survival. The accuracy of pre-operative MRSI in differentiating low- from high-grade oligodendrogliomas (ODGs) was also studied. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - June 11, 2018 Category: Radiology Authors: Caroline Bund, Fran çois Lefebvre, Roland Schott, Marie-Pierre Chenard, Benoît Lhermitte, Hélène Cebula, Stéphane Kremer, François Proust, Izzie-Jacques Namer Tags: Original contribution Source Type: research
Step adaptive fast iterative shrinkage thresholding algorithm for compressively sampled MR imaging reconstruction
In order to accelerate magnetic resonance imaging (MRI) scanning, fast MRI technique based on compressed sensing (CS) was proposed. The shrinkage thresholding algorithm (STA) is an efficient method in related algorithms to decrease the incoherent artifacts produced by the undersampling in k-space directly. The traditional STA uses the fixed iteration step size during the reconstruction progress, and it is not conducive to accelerate the convergence speed. In order to improve global iteration efficiency, in this paper, step adaptive fast iterative shrinkage thresholding algorithm (SAFISTA) was proposed for MRI reconstructio...
Source: Magnetic Resonance Imaging - June 7, 2018 Category: Radiology Authors: Wei Wang, Ning Cao Source Type: research
Brain gadolinium deposition, hyperintense MRI signals, and resonance contrast agents
The Personal View article by Gulani and colleagues [1] provides evidenced-based recommendations for the clinical diagnosis and radiologic investigations of gadolinium-based contrast agents (GBCAs) [1]. As a result, this excellent review article by Gulani et al. will lead to an increased physicians' awareness of these issues. These practical recommendations (which are supported and written by or on behalf of the International Society for Magnetic Resonance in Medicine [1]) are based on published data and cover all aspects of diagnostic radiology, including recent regulatory specifications. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - June 6, 2018 Category: Radiology Authors: Antonella Costa, Anna Ronchi, Paolo D. Pigatto, Gianpaolo Guzzi Tags: Letter to the Editor Source Type: research
An autoencoder based formulation for compressed sensing reconstruction
This work proposes a new formulation for image reconstruction based on the autoencoder framework. The work follows the adaptive approach used in prior dictionary and transform learning based reconstruction techniques. Existing autoencoder based reconstructions are non-adaptive; they are trained on a separate training set and applied on another. In this work, the autoencoder is learnt from the patches of the image it is reconstructing. Experimental studies on MRI reconstruction shows that the proposed method outperforms state-of-the-art methods in dictionary learning, transform learning and (non-adaptive) autoencoder based ...
Source: Magnetic Resonance Imaging - June 5, 2018 Category: Radiology Authors: Angshul Majumdar Tags: Original contribution Source Type: research
Cardiac MRI and radionuclide ventriculography for measurement of left ventricular ejection fraction in ICD candidates
Current guidelines provide left ventricular ejection fraction (LVEF) criterion for use of implantable cardioverter defibrillators (ICD) but do not specify which modality to use for measurement. We compared LVEF measurements by radionuclide ventriculography (RNV) vs cardiac MRI (CMR) in ICD candidates to assess impact on clinical decision making. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 31, 2018 Category: Radiology Authors: Vamshi K. Kotha, Djeven P. Deva, Kim A. Connelly, Michael R. Freeman, Raymond T. Yan, Iqwal Mangat, Anish Kirpalani, Joseph J. Barfett, Joanna Sloninko, Hui Ming Lin, John J. Graham, Andrew M. Crean, Laura Jimenez-Juan, Paul Dorian, Andrew T. Yan Tags: Original contribution Source Type: research
Pre-treatment functional MRI of breast cancer: T2* evaluation at 3 T and relationship to dynamic contrast-enhanced and diffusion-weighted imaging
Baseline T2* relaxation time has been proposed as an imaging biomarker in cancer, in addition to Dynamic Contrast-Enhanced (DCE) MRI and diffusion-weighted imaging (DWI) parameters. The purpose of the current work is to investigate sources of error in T2* measurements and the relationship between T2* and DCE and DWI functional parameters in breast cancer. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 31, 2018 Category: Radiology Authors: Evanthia Kousi, Elizabeth A.M. O'Flynn, Marco Borri, Veronica A. Morgan, Nandita M. de Souza, Maria A. Schmidt Source Type: research
Application of compressed sensing to 3D magnetic resonance cholangiopancreatography for the evaluation of pancreatic cystic lesions
The aim of this study was to assess changes in acquisition time, image quality and evaluation of pancreatic cysts when applying CS to a 3D MRCP sequence. Thirty subjects (17F; 13M) undergoing MRCP for evaluation of pancreatic cyst(s) were prospectively recruited and underwent 3D MRCP and CS 3D MRCP (CS factor = 2) on a 3T scanner. The acquisition time was recorded. Two experienced radiologists independently recorded quality of the images, presence of artifacts, visualization of the main pancreatic duct, bile ducts and index pancreatic cyst using a five-point scale. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 31, 2018 Category: Radiology Authors: Alessandro Furlan, Ersin Bayram, Senthur Thangasamy, Dale Barley, Anil Dasyam Tags: Original contribution Source Type: research
Improved method for MR microscopy of brain tissue cultured with the interface method combined with Lenz lenses
MR in microscopy can non-invasively image the morphology of living tissue, which is of particular interest in studying the mammalian brain. Many studies use live animals for basic research on brain functions, disease pathogenesis, and drug development. However, in vitro systems are on the rise, due to advantages such as the absence of a blood-brain barrier, predictable pharmacokinetics, and reduced ethical restrictions. Hence, they present an inexpensive and adequate technique to answer scientific questions and to perform drug screenings. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 29, 2018 Category: Radiology Authors: R. Kamberger, K. G öbel-Guéniot, J. Gerlach, O.G. Gruschke, J. Hennig, P. LeVan, C. Haas, J.G. Korvink Source Type: research
Intravoxel incoherent motion diffusion-weighted magnetic resonance imaging in characterization of axillary lymph nodes: Preliminary animal experience
To investigate the diagnostic value of intravoxel incoherent motion (IVIM) diffusion-weighted imaging (DWI) for discriminating axillary metastatic from non-metastatic lymph nodes (LNs) in rabbit models. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 28, 2018 Category: Radiology Authors: Yueqiang Zhu, Xubin Li, Fengkui Wang, Jun Zhang, Wei Li, Yan Ma, Jin Qi, Song Ren, Zhaoxiang Ye Source Type: research
A fast level set method for inhomogeneous image segmentation with adaptive scale parameter
It is difficult to segment images in the presence of intensity inhomogeneity due to the overlap of the intensity ranges between different object regions. To deal with this problem, this paper presents a novel level set method to segment inhomogeneous images. Based on the inhomogeneous image model, an optimal segmentation plane is derived in image domain to provide the optimal partition for every pixel. With the plane, a new region-based pressure force function is proposed and used to define an energy functional in the level set formulation on the whole image region. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 25, 2018 Category: Radiology Authors: Guopeng Huang, Hongbing Ji, Wenbo Zhang Source Type: research
Editorial Board
(Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 23, 2018 Category: Radiology Source Type: research
Whole lesion histogram analysis of meningiomas derived from ADC values. Correlation with several cellularity parameters, proliferation index KI 67, nucleic content, and membrane permeability
To analyze several histopathological features and their possible correlations with whole lesion histogram analysis derived from ADC maps in meningioma. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - May 18, 2018 Category: Radiology Authors: Alexey Surov, Gordian Hamerla, Hans Jonas Meyer, Karsten Winter, Stefan Schob, Eckhard Fiedler Tags: Original contribution Source Type: research
