A unilateral magnet with an extended constant magnetic field gradient

Naranjo, Juan Carlos García; Mastikhin, Igor V.; Colpitts, Bruce G.; Balcom, Bruce J.

doi:10.1016/j.jmr.2010.09.018

Cited by 27 publications

(15 citation statements)

References 28 publications

(42 reference statements)

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“…In practice however, such a simple arrangement will result in the desired field being a saddle point at the origin, comprising two maxima and one minimum, or two minima and one maximum with respect to the three Cartesian axes. This is largely similar to what has been reported in the proposed designs of one-sided magnets for nuclear magnetic resonance (NMR) [14,15], for which the resulting small uniform field volume measuring only a few mm at 10-20 mm away from the pole surface is sufficient.…”

Section: The Magnet Conceptsupporting

confidence: 85%

A permanent MRI magnet for magic angle imaging having its field parallel to the poles

McGinley

Ristić

Young

2016

Journal of Magnetic Resonance

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Section: The Magnet Conceptsupporting

confidence: 85%

A permanent MRI magnet for magic angle imaging having its field parallel to the poles

McGinley

Ristić

Young

2016

Journal of Magnetic Resonance

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“…It is a simple array of three magnet blocks with the magnetic field oriented in the same direction. A vertical displacement of the central block allows generating a homogeneous spot [ 15 ] or an extended constant gradient [ 16 ]. The design is compact and safe and the weight of the magnet array is 5 kg.…”

Section: Methodsmentioning

confidence: 99%

“…This paper presents a magnetic resonance method for phosphate ester analysis employing a three-magnet array [ 15 , 16 ] as a sensor. The intention of this work is to develop a rapid and simple method for estimating the degree of degradation of phosphate ester hydraulic fluids in power plant turbines.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Phosphate Ester Hydraulic Fluid in Power Station Turbines Investigated by a Three-Magnet Unilateral Magnet Array

Guo

Naranjo

2014

Sensors

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A three-magnet array unilateral NMR sensor with a homogeneous sensitive spot was employed for assessing aging of the turbine oils used in two different power stations. The Carr-Purcell-Meiboom-Gill (CPMG) sequence and Inversion Recovery-prepared CPMG were employed for measuring the 1H-NMR transverse and longitudinal relaxation times of turbine oils with different service status. Two signal components with different lifetimes were obtained by processing the transverse relaxation curves with a numeric program based on the Inverse Laplace Transformation. The long lifetime components of the transverse relaxation time T2eff and longitudinal relaxation time T1 were chosen to monitor the hydraulic fluid aging. The results demonstrate that an increase of the service time of the turbine oils clearly results in a decrease of T2eff,long and T1,long. This indicates that the T2eff,long and T1,long relaxation times, obtained from the unilateral magnetic resonance measurements, can be applied as indices for degradation of the hydraulic fluid in power station turbines.

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“…For the measurement of D, the effective T 2 (T 2eff ) was measured employing a three-magnet array unilateral magnet with extended constant gradient (B 0 = 0.079 T, G = 2.1 T/m) [9]. The echo time was varied from 600 to 1600 µs with steps of 100 µs.…”

Section: Methodsmentioning

confidence: 99%

Hemoglobin S Polymerization Effect on Water Self-Diffusion Coefficient

Guevara¹,

Naranjo²,

Mengana³

et al. 2014

ABC

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The transversal relaxation time, the effective transversal relaxation time and the water self-diffusion coefficient are evaluated during hemoglobin S polymerization. One homogeneous permanent magnet and one inhomogeneous and portable unilateral magnet with a very strong and constant static magnetic field gradient were utilized. The Carr-Purcell-Meiboom-Gill method was used before and after placing the studied samples 24 hours at 36˚C to guarantee the polymerization. The transversal relaxation shows two exponents after polymerization supporting the concept of partially polymerized hemoglobin. The effective transversal relaxation time decreases around 40%, which can be explained by the increase of water self-diffusion coefficient 1.8 times as a main value. This result can be explained considering the effects of the agglutination process on the obstruction and hydration effects in a partially polymerized solution.

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A unilateral magnet with an extended constant magnetic field gradient

Cited by 27 publications

References 28 publications

A permanent MRI magnet for magic angle imaging having its field parallel to the poles

A permanent MRI magnet for magic angle imaging having its field parallel to the poles

Degradation of Phosphate Ester Hydraulic Fluid in Power Station Turbines Investigated by a Three-Magnet Unilateral Magnet Array

Hemoglobin S Polymerization Effect on Water Self-Diffusion Coefficient

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