NMR characterization of injection-moulded alumina green compacts

Wang, Pu Sen; Malghan, S.G.; Dapkunas, S. J.; Hens, K. F.; Raman, R.

doi:10.1007/bf01178445

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…A 15 mm wide by 30 mm high RF-coil was used for detecting nuclear spin-echo signals of the aqueous protons, with a (π/2)-τ -π-τ -echo pulse sequence. More details on the experimental setup can be found elsewhere [7].…”

mentioning

confidence: 99%

Artifacts in magnetic resonance imaging from metals

Bennett¹,

Wang²,

Donahue³

1996

Journal of Applied Physics

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Metallic biomedical implants, such as aneurysm clips, endoprostheses, and internal orthopedic devices give rise to artifacts in the magnetic resonance image (MRI) of patients. Such artifacts impair the information contained in the image in precisely the region of most interest, namely near the metallic device. Ferromagnetic materials are contraindicated because of the hazards associated with their movement during the MRI procedure. In less-magnetic metals, it has been suggested that the extent of the artifact is related to the magnetic susceptibility of the the metal, but no systematic data appear to be available. When the susceptibility is sufficiently small, an additional artifact due to electrical conductivity is observed. We present an initial systematic study of MRI artifacts produced by two low susceptibility metals, titanium (relative permeability µr ≈ 1.0002) and copper (µr ≈ 0.99998), including experimental, theoretical, and computer simulation results. 87.59.Pw, 75.20.En

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mentioning

confidence: 99%

Artifacts in magnetic resonance imaging from metals

Bennett¹,

Wang²,

Donahue³

1996

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…An alternate way of measuring T 2 is by nuclear spin-echo multiple pulse sequence [12] . T 2 can be calculated from I =I 0 exp(-r/r 2 )…”

Section: Resultsmentioning

confidence: 99%

“…The facility at NIST is capable of performing solid imaging at the proton frequency. Solid organic binder (a wax/polypropylene mixture) distributions in injection molded alumina greenbodies have been studied by monitoring nuclear spin-echo intensities [13]. Silicon nitride slurry homogeneity has also been investigated by a "soft pulse technique" to map the water distribution in the slurries [14].…”

Section: Resultsmentioning

confidence: 99%

“…Microwave data were taken using a hand-held probe applied to four different locations on the specimen, reading from outside its plastic bag. A was left in its bag for three days, then measured gravimetrically again at 13.0 % mass fraction of moisture, indicating 0.2 % loss during storage. Using the resonant frequency as the indicator of moisture content, the microwave probe reading had changed by 0.32 %.…”

Section: Methodsmentioning

confidence: 99%

“…But for the "free" water, a "soft" pulse of sine shape replaced the "hard" pulse to avoid diffusion. The detail can be found elsewhere [12][13].…”

Section: Methodsmentioning

confidence: 99%

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