Magnetic susceptibility imaging for nondestructive evaluation (using SQUID magnetometer)

Wikswo, John P.; Ma, Yanxue; Sepulveda, N.G.; Tan, S.; Thomas, Ian M.; Lauder, A.

doi:10.1109/77.233464

Cited by 36 publications

(11 citation statements)

References 18 publications

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“…Three-dimensional methods of MST have not been implemented, but the analytical groundwork for the method has been developed [42, 43]. Further developments of MST for biological imaging [44], non-destructive evaluation (NDE) [45], diamagnetic and paramagnetic objects [46] and in a non-uniform magnetic field [47] have also been reported. Models including a system of voxels containing magnetically susceptible material, an array of excitation coils, and an array of sensors have been developed for magnetic relaxometry [48] and brain hemodynamics [49].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic AC susceptibility imaging (sASI) of magnetic nanoparticles

Ficko

Nadar

Diamond

2015

Journal of Magnetism and Magnetic Materials

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This study demonstrates a method for alternating current (AC) susceptibility imaging (ASI) of magnetic nanoparticles (mNPs) using low cost instrumentation. The ASI method uses AC magnetic susceptibility measurement to create tomographic images using an array of drive coils, compensation coils and fluxgate magnetometers. Using a spectroscopic approach in conjunction with ASI, a series of tomographic images can be created for each frequency measurement and is termed sASI. The advantage of sASI is that mNPs can be simultaneously characterized and imaged in a biological medium. System calibration was performed by fitting the in-phase and out-of-phase susceptibility measurements of an mNP sample with a hydrodynamic diameter of 100 nm to a Brownian relaxation model (R2 = 0.96). Samples of mNPs with core diameters of 10 and 40 nm and a sample of 100 nm hydrodynamic diameter were prepared in 0.5 ml tubes. Three mNP samples were arranged in a randomized array and then scanned using sASI with six frequencies between 425 and 925 Hz. The sASI scans showed the location and quantity of the mNP samples (R2 = 0.97). Biological compatibility of the sASI method was demonstrated by scanning mNPs that were injected into a pork sausage. The mNP response in the biological medium was found to correlate with a calibration sample (R2 = 0.97, p <0.001). These results demonstrate the concept of ASI and advantages of sASI.

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Section: Introductionmentioning

confidence: 99%

Spectroscopic AC susceptibility imaging (sASI) of magnetic nanoparticles

Ficko

Nadar

Diamond

2015

Journal of Magnetism and Magnetic Materials

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“…The simplest is to measure the DC magnetic moment as a function of position. A more powerful technique is to apply a DC magnetic field to the sample and map the susceptibility [2]. An alternative solution is to induce an eddy current response from the sample by using a very low power, low frequency driving magnetic field [3].…”

Section: Instrument Desi~nmentioning

confidence: 99%

Potential New Applications of SQUIDS and SQUID Arrays in NDE

Hibbs

1993

Review of Progress in Quantitative Nondestructive Evaluation

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“…21 For investigations of diamagnetic and paramagnetic objects, an imaging susceptometer based on SQUID that exposes an object to dc magnetic fields has been reported. 22,23 In the case of ferromagnetic metal NDE, the secondary magnetic field is caused not only by eddy currents but also by the focused magnetic flux based on high permeability. In order to distinguish between these phenomena, we have developed an imaging system capable of detecting and analyzing three-dimensional secondary magnetic field components utilizing a large area primary magnetic field exposure.…”

Section: Introductionmentioning

confidence: 99%

Magnetic property mapping system for analyzing three-dimensional magnetic components

Tsukada

Kiwa

2006

Review of Scientific Instruments

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A magnetic measurement system utilizing a vector magnetic sensor for analyzing and mapping low frequency magnetic properties of metals has been developed for nondestructive evaluation. The measurement system consists mainly of an induction coil which can expose a large sample area, a vector magnetic sensor for detecting magnetic fields emanating from a sample, a lock-in amplifier, and a two-dimensional scanning stage. The system was determined to have a high magnetic sensitivity corresponding to less than 1 nT in the locked-in state. The magnetic field strength change was detected in a sample that contained a slit of width greater than 1 mm. Time sequential vector component ͑normal and tangential͒ maps were developed. An iron plate as an example of a ferromagnetic metal and an aluminum plate as an example of a good conducting and nonferromagnetic material were compared using this system. Analyzing the vector component maps could differentiate differences in the magnetic properties, such as permeability, eddy current distribution, and residual magnetism.

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Magnetic susceptibility imaging for nondestructive evaluation (using SQUID magnetometer)

Cited by 36 publications

References 18 publications

Spectroscopic AC susceptibility imaging (sASI) of magnetic nanoparticles

Spectroscopic AC susceptibility imaging (sASI) of magnetic nanoparticles

Potential New Applications of SQUIDS and SQUID Arrays in NDE

Magnetic property mapping system for analyzing three-dimensional magnetic components

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