Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

NMR Concepts
(Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering)
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - June 25, 2015 Category: Radiology Tags: NMR Concepts Source Type: research

DVD Review
(Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering)
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - June 25, 2015 Category: Radiology Tags: DVD Review Source Type: research

Issue Information
(Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering)
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - June 25, 2015 Category: Radiology Tags: Issue Information Source Type: research

2D B0 mapping of micro solenoids with and without FC‐84 and SU‐8 at 9.4 T
ABSTRACT This work addresses the effect of susceptibility matching improvement of micro‐solenoid coil materials on decreasing the B0 deviation in MR imaging of mass‐limited samples at high Tesla animal scanners. For this purpose, I investigated the effect of improving the solenoids of 1 and 0.5 mm diameters “susceptibility matching” by surrounding them in FC‐84 and SU‐8. Comparing 2D B0 maps of solenoids of 1 mm show that the mean value of B0 deviation has decreased by factors of 15.6 and 4.72 for the coils embedded with FC‐84 and SU‐8 respectively. Likewise, the mean of B0 deviation has decreased by factor...
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - June 10, 2015 Category: Radiology Authors: Mohammad Mohammadzadeh Tags: Research Article Source Type: research

A more accurate tuning‐matching technique for NMR probes using wobulation and variable phase shifter
ABSTRACT For optimizing sensitivity and RF excitation, high resolution NMR probes have to be tuned at the Larmor frequency and matched to 50 Ω‐transmission lines to which they are connected. For achieving this setting, one usually resorts to the wobulation function which consists in sweeping the frequency of the power source while monitoring and minimizing the reflected power taken from a directional coupler through adjusting the tuning and matching capacitors. However, the presence of a transmission‐reception switch between the directional coupler and the probe leads to the appearance of extra loss and reactance, and...
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - June 10, 2015 Category: Radiology Authors: Guillaume Ferrand, Michel Luong, Gaspard Huber, Hervé Desvaux Tags: Research Article Source Type: research

Subthreshold CMOS transistors are largely immune to magnetic field effects when operated above 11 T
We report on measurements of n‐channel field‐effect transistor structures with multiple drain/source contacts, fabricated in a commercial complementary metal‐oxide‐semiconductor (CMOS) technology, at high magnetic field strengths. The focus lies on field dependent effects such as the Hall effect to better understand how these key electronic devices behave when their embedding circuits are immersed in strong magnetic fields. In addition, measurement results of relevant electrical parameters for circuit design, i.e., the saturation current of IDS as well as the slope of IDS and threshold voltage Vt will be shown. The...
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - June 8, 2015 Category: Radiology Authors: Jens Höfflin, Christian Sander, Pascal Gieschke, Andreas Greiner, Jan G. Korvink Tags: Research Article Source Type: research

Numerical methods and software tools for simulation, design, and resonant mode analysis of radio frequency birdcage coils used in MRI
In this study, finite element method (FEM) based methods have been proposed for accurate time‐harmonic electromagnetic simulations, estimation of the tuning capacitors on the rungs or end rings, and the resonant mode analysis of the birdcage coils. Capacitance estimation was achieved by maximizing the magnitude of the port impedance at the desired frequency while simultaneously minimizing the variance of RF magnetic field in the region of interest. In order for the proposed methods to be conveniently applicable, two software tools, resonant mode and frequency domain analyzer (RM‐FDA) and Optimum Capacitance Finder (Opt...
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - June 5, 2015 Category: Radiology Authors: Necip Gurler, Yusuf Ziya Ider Tags: Research Article Source Type: research

A fast and simple method for calibrating the flip angle in hyperpolarized 13C MRS experiments
ABSTRACT Hyperpolarized 13C Magnetic resonance represents a promising modality for in vivo studies of intermediary metabolism of bio‐molecules and new biomarkers. Although it represents a powerful tool for metabolites spatial localization and for the assessment of their kinetics in vivo, a number of technological problems still limits this technology and needs innovative solutions. In particular, the optimization of the signal‐to‐noise ratio during the acquisitions requires the use of pulse sequences with accurate flip angle calibration, which is performed by adjusting the transmit power in the prescan step. This is ...
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - June 5, 2015 Category: Radiology Authors: Giulio Giovannetti, Francesca Frijia, Alessandra Flori, Daniele De Marchi, Giovanni Donato Aquaro, Luca Menichetti, Jan Henrik Ardenkjaer‐Larsen Tags: Research Article Source Type: research

Real‐time image reconstruction for pulse EPR oxygen imaging using a GPU and lookup table parameter fitting
ABSTRACT The importance of tissue oxygenation has led to a great interest in methods for imaging pO2 in vivo. Electron paramagnetic resonance imaging (EPRI) provides noninvasive, near absolute 1 mm‐resolved 3D images of pO2 in the tissues and tumors of living animals. Current EPRI image reconstruction methods tend to be time consuming and preclude real‐time visualization of information. Methods are presented to significantly accelerate the reconstruction process in order to enable real‐time reconstruction of EPRI pO2 images. These methods are image reconstruction using graphics processing unit (GPU)‐based 3D filter...
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - June 5, 2015 Category: Radiology Authors: Gage Redler, Zhiwei Qiao, Boris Epel, Howard J. Halpern Tags: Research Article Source Type: research

Assessment of MR compatibility and machinability using the fuzzy comprehensive evaluation method for material selection of MR device
ConclusionA thorough examination of four commonly used engineering materials has been discussed and the fuzzy comprehensive evaluation method is suitable for choosing MR compatible robot materials. © 2015 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering), 2015 (Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering)
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - May 30, 2015 Category: Radiology Authors: Shan Jiang, Zhengxing Wu, Zhaowei Ren, Zhiyong Yang Tags: Research Article Source Type: research

Issue Information
(Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering)
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - May 27, 2015 Category: Radiology Tags: Issue Information Source Type: research

NMR Concepts
(Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering)
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - May 27, 2015 Category: Radiology Tags: NMR Concepts Source Type: research

DVD Review
(Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering)
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - May 27, 2015 Category: Radiology Tags: DVD Review Source Type: research

Circuit level simulation of MRI receive chain using excitation derived from images
ABSTRACT We introduce a novel component‐level simulation method with which to characterize the performance of the electronic interfaces and circuitry of a magnetic resonance imaging (MRI) receiver. The Matlab‐based toolbox first reconstructs idealized coil free induction decay signals from real MR images, then uses these signals to drive a transistor‐level and extracted‐layout simulation of the desired receiver architecture. The simulated receiver's outputs are read back into the toolbox, which then reconstructs the MR images. By comparing the reconstructed images with the original ones, important design characteri...
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - May 27, 2015 Category: Radiology Authors: Mazin Jouda, Oliver G. Gruschke, Jan G. Korvink Tags: Research Article Source Type: research

NMR Concepts
(Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering)
Source: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering - April 23, 2015 Category: Radiology Tags: NMR Concepts Source Type: research