Magnetic properties of materials for MR engineering, micro-MR and beyond.

@article{Wapler2014MagneticPO,
  title={Magnetic properties of materials for MR engineering, micro-MR and beyond.},
  author={Matthias C Wapler and Jochen Leupold and Iulius Dragonu and Dominik von Elverfeld and Maxim Zaitsev and Ulrike Wallrabe},
  journal={Journal of magnetic resonance},
  year={2014},
  volume={242},
  pages={
          233-42
        }
}
We present the results of a systematic measurement of the magnetic susceptibility of small material samples in a 9.4 T MRI scanner. We measured many of the most widely used materials in MR engineering and MR micro technology, including various polymers, optical and substrate glasses, resins, glues, photoresists, PCB substrates and some fluids. Based on our data, we identify particularly suitable materials with susceptibilities close to water. For polyurethane resins and elastomers, we also show… Expand
Materials with low DC magnetic susceptibility for sensitive magnetic measurements
Materials with very low DC magnetic susceptibility have many scientific applications. To our knowledge however, relatively little research has been conducted with the goal to produce a totallyExpand
Efficient Experimental Design for Measuring Magnetic Susceptibility of Arbitrarily Shaped Materials by MRI
Magnetic susceptibility represents the degree of magnetization of a material in an applied magnetic field. It is a critical material parameter in MRI because difference of magnetic susceptibilityExpand
Experimental setup for bulk susceptibility effect-minimized, multi-orientation MRI of ex-vivo tissue samples.
TLDR
An experimental method to effectively minimize bulk susceptibility-induced B0 perturbation in multi-orientation ex vivo MRI is demonstrated and promises to benefit a range of tissue orientation-dependent MR property studies. Expand
Physical and numerical phantoms for the validation of brain microstructural MRI: A cookbook
TLDR
The current review aims to provide guidelines on how to build, implement, or choose the right phantom for a particular application, along with an overview of the current state‐of‐the‐art of phantoms dedicated to study brain microstructure with MRI. Expand
Glassy carbon microelectrodes minimize induced voltages, mechanical vibrations, and artifacts in magnetic resonance imaging
TLDR
Experimental, theoretical, and finite element modeling establish that GC microelectrodes exhibit significant MRI compatibility, hence demonstrating clear clinical advantages over current conventional thin-film materials, further opening avenues for wider adoption of GC microElectrodes in chronic clinical applications. Expand
Torque property of titanium alloy cerebral aneurysm clips in a magnetic resonance scanner
TLDR
A visual inspection showed that the torque applied to Ti alloy cerebral aneurysm clips is comparable with that in the case of those of Elgiloy, and contradictory results of a larger torque for smaller-susceptibility products could be explained by the new theory, which takes into account the crystal susceptibility anisotropy in addition to the conventional torque. Expand
Fabrication of a spherical inclusion phantom for validation of magnetic resonance-based magnetic susceptibility imaging
TLDR
The proposed phantom can provide a useful testbed for validation of MR phase imaging and MR-based magnetic susceptibility reconstruction and was used to validate publicly available codes for quantitative susceptibility mapping. Expand
Fabrication and validation of reference structures for the localization of subdural standard- and micro-electrodes in MRI.
TLDR
The precise localization of subdural micro- and standard electrodes in magnetic resonance imaging (MRI) in phantom experiments is validated and post-implantation electrode localization using MRI may be advantageous compared to the common alternative of CT-MRI image co-registration. Expand
MR-compatible optical microscope for in-situ dual-mode MR-optical microscopy
TLDR
A dual-mode imaging platform that combines optical microscopy with magnetic resonance microscopy and a waveguide in the optical layout for the electromagnetic shielding of the camera minimizes the noise increase in the MR and optical images below practical relevance is presented. Expand
Specific heat, thermal conductivity, and magnetic susceptibility of cyanate ester resins – An alternative to commonly used epoxy resins
Abstract In low temperature experiments, resins have many applications as glues or thermal and electrical insulators. Cyanate ester resins (CEs) are a high-temperature compatible thermoset resinExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 32 REFERENCES
Magnetic resonance imaging for the determination of magnetic susceptibility of materials.
A magnetic resonance imaging method for volume magnetic susceptibility estimate of materials immersed in a liquid containing resonant nuclei is proposed. The method uses either the standard spin-echoExpand
Magnetic susceptibility of some materials used for apparatus construction (at 295 K)
The magnetic susceptibility, χ, at 295 K of a wide variety of common laboratory construction materials has been carefully measured. Only materials with well‐characterized compositions are included inExpand
Magnetic susceptibility measurement using 2D magnetic resonance imaging
The authors describe a nuclear magnetic resonance (NMR) method for measuring the magnetic susceptibility of bar-shaped samples that have an arbitrary cross-section and do not produce an MR signal.Expand
Accurate and sensitive measurements of magnetic susceptibility using echo planar imaging.
TLDR
A previously proposed MR imaging (MRI) method was improved to facilitate sensitive in-house measurements of different phantom materials so that such artifacts can more easily be minimized. Expand
The role of magnetic susceptibility in magnetic resonance imaging: MRI magnetic compatibility of the first and second kinds.
TLDR
The quantitative use of susceptibility data is important to MRI, but the use of literature values for the susceptibility of materials is often difficult because of inconsistent traditions in the definitions and units used for magnetic parameters-particularly susceptibility. Expand
Magnetism in high-resolution NMR probe design. I: general methods
In Part I, we review some basic physics, properties, and types of magnetism as they relate to high-resolution nuclear magnetic resonance (NMR) probe design, both in liquids and in solids, and some ofExpand
Magnetic resonance imaging measurement of volume magnetic susceptibility using a boundary condition.
TLDR
A magnetic resonance imaging method is described for measuring the magnetic susceptibility difference between two homogeneous macroscopic compartments in contact with each other using signals from both sides in the vicinity of the boundary. Expand
Susceptibility-limited resolution in nuclear magnetic resonance microscopy
Abstract Sensitivity considerations suggest that a voxel resolution of (10 μm)3 should be possible for NMR microscopy at 400 MHz. It is shown however that diamagnetic susceptibility inhomogeneity canExpand
MRI susceptometry: Image‐based measurement of absolute susceptibility of MR contrast agents and human blood
We present a novel NMR imaging technique that allows absolute determination of the magnetic susceptibility constant, χ, of a solution. By comparing the phase difference of MR images produced with anExpand
NMR probes for measuring magnetic fields and field dynamics in MR systems
TLDR
High‐resolution magnetic field probes based on pulsed liquid‐state NMR are presented and sufficient SNR to follow the relevant field evolution without signal averaging and at bandwidths up to hundreds of kHz is demonstrated. Expand
...
1
2
3
4
...