Magnetic Field Variations Near Weak Magnetic Materials Studied by Magnetic Resonance Imaging Techniques

Frollo, Ivan; Andris, Peter; Gogola, D.; Přibil, Jiří; Valkovič, Ladislav; Szomolányi, Pavol

doi:10.1109/tmag.2012.2191298

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…The interaction of the planar electromagnetic phantom, or the weak magnetic materials of the various shapes with homogeneous static magnetic field, was described and mathematically modelled in [16,17]. The magnetic field distribution in these articles was calculated as the superposition of elementary areas, as opposed to this study where magnetic field distribution was calculated as a superposition of individual magnetic domains.…”

Section: Introductionmentioning

confidence: 99%

Magnetic resonance imaging of the static magnetic field distortion caused by magnetic nanoparticles: Simulation and experimental verification

Gogola

Štrbák

Krafčík

et al. 2015

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 99%

Magnetic resonance imaging of the static magnetic field distortion caused by magnetic nanoparticles: Simulation and experimental verification

Gogola

Štrbák

Krafčík

et al. 2015

Journal of Magnetism and Magnetic Materials

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“…Special diagnostic techniques have to be applied when an object consisting of weak magnetic materials is inserted into a stationary homogeneous magnetic field of the MR scanner [1]. These materials with higher magnetic susceptibility cause local inhomogeneities of the main field of MR tomograph.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Resonance Imaging of Surgical Implants Made from Weak Magnetic Materials

Gogola¹,

Krafčík²,

Štrbák³

et al. 2013

Measurement Science Review

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Materials with high magnetic susceptibility cause local inhomogeneities in the main field of the magnetic resonance (MR) tomograph. These inhomogeneities lead to loss of phase coherence, and thus to a rapid loss of signal in the image. In our research we investigated inhomogeneous field of magnetic implants such as magnetic fibers, designed for inner suture during surgery. The magnetic field inhomogeneities were studied at low magnetic planar phantom, which was made from four thin strips of magnetic tape, arranged grid-wise. We optimized the properties of imaging sequences with the aim to find the best setup for magnetic fiber visualization. These fibers can be potentially exploited in surgery for internal stitches. Stitches can be visualized by the magnetic resonance imaging (MRI) method after surgery. This study shows that the imaging of magnetic implants is possible by using the low field MRI systems, without the use of complicated post processing techniques (e.g., IDEAL).

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Higher precision integer operations instead of floating-point operations in computers or microprocessors

Zhang

Luo

et al. 2021

Review of Scientific Instruments

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The rounding errors of floating-point operations are inevitable in computers or microprocessors, and this issue will make the calculation results inaccurate, unreliable, or even completely incorrect. For this purpose, this paper proposes to replace floating-point operations with integer operations to improve the operation precision. The key lies in not only controlling the variable type as the integer to avoid the automatic conversion of intermediate operation results into floating-point numbers but also converting floating-point operations in the operation process into integer operations using some numerical calculation methods. Lock-in amplifier is one of the most widely used instruments in the field of weak signal detection. This paper only takes the digital lock-in amplifier (DLIA) as an example for detailed analysis and proposes a DLIA based on integer calculation. The experimental results show that replacing floating-point operations with integer operations can obtain higher operation precision without “wasting” memory, and the improvement will be more significant as the calculation amount increases. The research will help to further improve the calculation accuracy of digital signal processing and other scientific computations in computers or microprocessors.

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Magnetic Field Variations Near Weak Magnetic Materials Studied by Magnetic Resonance Imaging Techniques

Cited by 5 publications

References 15 publications

Magnetic resonance imaging of the static magnetic field distortion caused by magnetic nanoparticles: Simulation and experimental verification

Magnetic resonance imaging of the static magnetic field distortion caused by magnetic nanoparticles: Simulation and experimental verification

Magnetic Resonance Imaging of Surgical Implants Made from Weak Magnetic Materials

Higher precision integer operations instead of floating-point operations in computers or microprocessors

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