A Novel 1H/ 3He Dual-Tuned Transmit Coil at Ultra-low Field MRI Designed by Using Electromagnetic Field and Radio Frequency Circuit Co-Simulation Method.

2018 ◽  
Author(s):  
Y. Dou ◽  
Y. Li ◽  
J. Xu ◽  
Q. Chen ◽  
L. Wang ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Radio Frequency ◽  
Simulation Method ◽  
Low Field ◽  
Low Field Mri ◽  
Radio Frequency Circuit

Optimization and Testing of a 1H/3He Double-Nuclear Quadrature Transmit Coil, Applying the Analytical Method at 0.06T

2020 ◽  
Vol 10 (11) ◽  
pp. 2699-2706
Author(s):  
Yan Dou ◽  
Jinzhang Xu ◽  
Yuxia Hu ◽  
Liangliang Hu ◽  
Yi Wang ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Design Method ◽  
Noble Gas ◽  
Simulation Method ◽  
Pso Algorithm ◽  
Optimization Method ◽  
Complex Model ◽  
Rf Coil ◽  
Low Field ◽  
Em Field

Application of polarized noble gas technology in lung functional magnetic resonance imaging (fMRI) has garnered attention for its unique advantages, such as high resolution and a lack of radiation exposure. This paper presents a 4-channel radio frequency (RF) coil design method for applications of an 1H/3He MRI system at the ultra-low field of 0.06T. For the complex model of the double-nuclear 1H/3He coil, the analytical optimization method (based on the theories of Biot-Savart law and PSO algorithm) and the electromagnetic (EM) field and radio frequency (RF) circuit co-simulation method was implemented to optimize the analysis, resulting in an effective evaluation. The simulation results demonstrated that the proposed model has the potential for imaging of the lung with the 1H/3He MRI system at an ultra-low field.

Improved Contrast in Ultra-Low-Field MRI with Time-Dependent Bipolar Prepolarizing Fields: Theory and NMR Demonstrations

2013 ◽  
Vol 20 (3) ◽  
pp. 327-336 ◽  
Author(s):  
Jaakko O. Nieminen ◽  
Jens Voigt ◽  
Stefan Hartwig ◽  
Hans Jürgen Scheer ◽  
Martin Burghoff ◽  
...  
Keyword(s):  
Field Strength ◽  
Time Course ◽  
Signal Strength ◽  
Relaxation Rates ◽  
Resonance Imaging ◽  
New Approach ◽  
Spin Lattice ◽  
Low Field ◽  
Low Field Mri ◽  
Magnetic Resonance Imaging Mri

Abstract The spin-lattice (T1) relaxation rates of materials depend on the strength of the external magnetic field in which the relaxation occurs. This T1 dispersion has been suggested to offer a means to discriminate between healthy and cancerous tissue by performing magnetic resonance imaging (MRI) at low magnetic fields. In prepolarized ultra-low-field (ULF) MRI, spin precession is detected in fields of the order of 10-100 μT. To increase the signal strength, the sample is first magnetized with a relatively strong polarizing field. Typically, the polarizing field is kept constant during the polarization period. However, in ULF MRI, the polarizing-field strength can be easily varied to produce a desired time course. This paper describes how a novel variation of the polarizing-field strength and duration can optimize the contrast between two types of tissue having different T1 relaxation dispersions. In addition, NMR experiments showing that the principle works in practice are presented. The described procedure may become a key component for a promising new approach of MRI at ultra-low fields

Improving Image Quality In Low-Field MRI With Deep Learning

2021 ◽  
Author(s):  
Armando Garcia Hernandez ◽  
Pierre Fau ◽  
Stanislas Rapacchi ◽  
Julien Wojak ◽  
Hugues Mailleux ◽  
...  
Keyword(s):  
Deep Learning ◽  
Image Quality ◽  
Low Field ◽  
Low Field Mri

Breast tumor imaging with ultra low field MRI

1994 ◽  
Vol 12 (3) ◽  
pp. 395-401 ◽  
Author(s):  
Kirsti I. Dean ◽  
Markku Komu
Keyword(s):  
Breast Tumor ◽  
Tumor Imaging ◽  
Low Field ◽  
Low Field Mri

Deep Learning–based Method for Denoising and Image Enhancement in Low-Field MRI

2021 ◽  
Author(s):  
Dang Bich Thuy Le ◽  
Meredith Sadinski ◽  
Aleksandar Nacev ◽  
Ram Narayanan ◽  
Dinesh Kumar
Keyword(s):  
Deep Learning ◽  
Image Enhancement ◽  
Low Field ◽  
Low Field Mri
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