Sequences for current-density and conductivity imaging with ultra-low-field MRI

2012 ◽  
Vol 57 (SI-1 Track-M) ◽  
Author(s):  
J. O. Nieminen ◽  
P. T. Vesanen ◽  
R. J. Ilmoniemi
Keyword(s):  
Current Density ◽  
Low Field ◽  
Low Field Mri ◽  
Conductivity Imaging

scholarly journals Evaluating the Performance of Ultra-Low-Field MRI for in-vivo 3D Current Density Imaging of the Human Head

2020 ◽  
Vol 8 ◽  
Author(s):  
Peter Hömmen ◽  
Antti J. Mäkinen ◽  
Alexander Hunold ◽  
René Machts ◽  
Jens Haueisen ◽  
...  
Keyword(s):  
Current Density ◽  
Human Head ◽  
Low Field ◽  
Current Density Imaging ◽  
Low Field Mri

Current-density imaging using ultra-low-field MRI with zero-field encoding

2014 ◽  
Vol 32 (6) ◽  
pp. 766-770 ◽  
Author(s):  
Panu T. Vesanen ◽  
Jaakko O. Nieminen ◽  
Koos C.J. Zevenhoven ◽  
Yi-Cheng Hsu ◽  
Risto J. Ilmoniemi
Keyword(s):  
Current Density ◽  
Zero Field ◽  
Low Field ◽  
Current Density Imaging ◽  
Low Field Mri

scholarly journals Demonstration of full tensor current density imaging using ultra-low field MRI

2019 ◽  
Vol 60 ◽  
pp. 137-144 ◽  
Author(s):  
P. Hömmen ◽  
J.-H. Storm ◽  
N. Höfner ◽  
R. Körber
Keyword(s):  
Current Density ◽  
Low Field ◽  
Current Density Imaging ◽  
Low Field Mri ◽  
Tensor Current

Current-density imaging using ultra-low-field MRI with adiabatic pulses

2014 ◽  
Vol 32 (1) ◽  
pp. 54-59 ◽  
Author(s):  
Jaakko O. Nieminen ◽  
Koos C.J. Zevenhoven ◽  
Panu T. Vesanen ◽  
Yi-Cheng Hsu ◽  
Risto J. Ilmoniemi
Keyword(s):  
Current Density ◽  
Adiabatic Pulses ◽  
Low Field ◽  
Current Density Imaging ◽  
Low Field Mri

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

A quadrature lowpass birdcage coil for a vertical low field MRI scanner

2004 ◽  
Vol 22B (1) ◽  
pp. 1-6 ◽  
Author(s):  
Giulio Giovannetti ◽  
Raffaello Francesconi ◽  
Luigi Landini ◽  
Vittorio Viti ◽  
Maria Filomena Santarelli ◽  
...  
Keyword(s):  
Birdcage Coil ◽  
Low Field ◽  
Low Field Mri
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