Digital gradient magnetic field reorientation in three-dimensional NMR zeugmatography

Bottomley, PA

doi:10.1088/0022-3735/14/9/007

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…The same current is carried by each coil, and the direction of the flowing current may be set in Helmholtz or anti-Helmholtz configuration. It is well known that a uniform magnetic field in a given direction can be produced using the former configuration (14), and the second one is widely used to produce linear field gradients (15,16).…”

Section: Calculus Of the Magnetic Fieldmentioning

confidence: 99%

Saddle coils for uniform static magnetic field generation in NMR experiments

Bonetto

Anoardo

Polello

2006

Concepts Magn. Reson.

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ABSTRACT:The magnetic flux density field (called, henceforth, "magnetic field," for the sake of simplicity) generated by a saddle coil system is numerically calculated in the whole space and experimentally tested in two different spatial planes. The uniformity of the magnetic field is studied using Taylor series expansions of the three components separately. The optimum geometry is revised and obtained from the second-order Taylor expansions. The most favorable relationship between saddle coil geometric parameters is determined in case the optimum geometry cannot be achieved (because of experimental restrictions). Approximated manipulable analytical expressions are obtained via fourthorder Taylor expansions of the three components of the magnetic field and compared with exact expressions. They were found to differ in less than 10 Ϫ3 % within a sample region, when typical sample and coil dimensions are considered. Deviations of the magnetic field produced by an optimum-compensating saddle coil system were contrasted with typical NMR field-cycling magnetic field inhomogeneities. Possible influences of such deviations in NMR experiments are discussed.

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Section: Calculus Of the Magnetic Fieldmentioning

confidence: 99%

Saddle coils for uniform static magnetic field generation in NMR experiments

Bonetto

Anoardo

Polello

2006

Concepts Magn. Reson.

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NMR imaging techniques and applications: A review

Bottomley

1982

Review of Scientific Instruments

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Over the past ten years, a variety of techniques have been proposed and demonstrated that enable the spatial discrimination and mapping of nuclear-magnetic-resonance (NMR) signals in heterogeneous objects. These NMR imaging techniques are currently finding useful application in clinical medicine and physiological chemistry, where their noninvasive, apparently hazard-free nature, and the sensitivity of the NMR signal to the state of biological tissue, are key advantages. This article reviews the historical development, the conceptual basis, and the applications of the various NMR imaging techniques. Qualitative descriptions and illustrations of each technique and an outline of imaging instrumentation are provided. Proton NMR imaging, in medicine, of pathological states such as cancer, imaging of relaxation time, chemical shift and flow parameters, imaging of nuclei other than hydrogen, and potential hazards are discussed and demonstrated with examples.

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