An Open Magnet Utilizing Ferro-Refraction Current Magnification

Pulyer, Yuly M.; Hrovat, Mirko I.

doi:10.1006/jmre.2001.2482

Cited by 9 publications

(6 citation statements)

References 7 publications

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“…Such a coil is the figure-eight coil [185,190] where the current flow follows the path of the figure eight. Sensors less open than unilateral ones can be constructed by exploring the principle of ferro-refraction that is, mirroring of magnetic dipoles by suitably placed iron plates [191].…”

Section: Magnets For Unilateral Nmrmentioning

confidence: 99%

Mobile single-sided NMR

Blümich

Perlo

Casanova

2008

Progress in Nuclear Magnetic Resonance Spectroscopy

431

299

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Section: Magnets For Unilateral Nmrmentioning

confidence: 99%

Mobile single-sided NMR

Blümich

Perlo

Casanova

2008

Progress in Nuclear Magnetic Resonance Spectroscopy

431

299

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“…Pulyer et al [9] have demonstrated the validity of producing an imaging region of homogeneous field outside the magnet configuration for MRI devices and figured out that for a reliable design of unilateral open magnet devices there must exist a saddle point of magnetic field outside the permanent magnet source, at which there is ∇B i = 0 (i = x, y, z). Thus, in the design of unilateral open MRI devices, it is essential to find the accurate location of the saddle point and it is highly desirable to develop a flexible method of magnetic field analysis, which not only has high efficiency and sufficient accuracy for the solution to open region problems with multiple materials, but also can give an analytical expression of the solution.…”

Section: Discussion Of Design Methodsmentioning

confidence: 98%

A New Development of Fully Open MRI Magnet by a Hybrid FEM-NESM Computation

Zhang¹,

Xie²

2006

Journal of Electromagnetic Waves and Applications

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A fully open permanent magnet configuration for magnetic resonance imaging (MRI) system, which can produce lice imaging region with field homogeneity outside the magnet structure, is presented. It is a totally new problem about magnet design to build a slice imaging region with homogeneous magnetic field outside the magnet source. In order to satisfy the special design requirement for the fully open magnet structure of unilateral MRI devices, a new approach based on the combination of finite element and new-style equivalent source methods (FEM-NESM) is proposed in detail. To verify the effectiveness of the combined method, the calculated results are compared with those obtained by finite element method. Good agreement is obtained. The possibility of the existence of such a remote slice region and the location and size of the slice region are discussed.

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“…Other devices rely on a region of magnetic field uniformity, where first‐order (and higher‐order) gradients are negligible; this precludes the kind of depth profiling afforded by the NMR‐MOUSE, but detects a larger ensemble of polarized spins and narrows the bandwidth of the signal, thereby increasing the signal‐to‐noise ratio (SNR) of the measured spectrum . An example of such a device is the NMR‐MOLE (Mobile Lateral Explorer) .…”

Section: Introductionmentioning

confidence: 99%

“…A detailed and comprehensive review of many single‐sided and other portable magnet configurations can be found in References , , and . Our group has also studied single‐sided magnet designs . Here we have developed a prototype system to achieve a penetration depth of ~8 cm while maintaining a mass of ~10 kg.…”

Section: Introductionmentioning

confidence: 99%

A portable single‐sided magnet system for remote NMR measurements of pulmonary function

et al. 2014

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In this work, we report initial results from a light-weight, low field magnetic resonance device designed to make relative pulmonary density measurements at the bedside. The development of this device necessarily involves special considerations for the magnet, RF and data acquisition schemes as well as a careful analysis of what is needed to provide useful information in the ICU. A homogeneous field region is created remotely from the surface of the magnet such that when the magnet is placed against the chest, an NMR signal is measured from a small volume in the lung. In order to achieve portability, one must trade off field strength and therefore spatial resolution. We report initial measurements from a ping-pong ball size region in the lung as a function of lung volume. As expected, we measured decreased signal at larger lung volumes since lung density decreases with increasing lung volume. Using a CPMG sequence with ΔTE=3.5 ms and a 20 echo train, a signal to noise ratio ~1100 was obtained from an 8.8mT planar magnet after signal averaging for 43 s. This is the first demonstration of NMR measurements made on a human lung with a light-weight planar NMR device. We argue that very low spatial resolution measurements of different lobar lung regions will provide useful diagnostic information for clinicians treating Acute Respiratory Distress Syndrome as clinicians want to avoid ventilator pressures that cause either lung over distension (too much pressure) or lung collapse (too little pressure).

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An Open Magnet Utilizing Ferro-Refraction Current Magnification

Cited by 9 publications

References 7 publications

Mobile single-sided NMR

Mobile single-sided NMR

A New Development of Fully Open MRI Magnet by a Hybrid FEM-NESM Computation

A portable single‐sided magnet system for remote NMR measurements of pulmonary function

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