Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1983-09-06
1986-10-14
Kreitman, Stephen A.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324307, 324319, 324309, G01R 3308
Patent
active
046175164
ABSTRACT:
A cylindrical coil for providing a magnetic field having a substantially linear gradient in an axial direction within the volume of the cylinder, as can be utilized in NMR apparatus, includes a cylindrical coil support structure and electrically conductive winding turns wound on the outer surface of the support structure. The winding turns are electrically insulated from each other and are located such that the axial density of the winding turns increases linearly from the center of the coil to each axial end thereof. Preferably, the winding turns are located so that the angular position .phi. of the spiral path of the windings on the surface of the cylindrical support structure satisfies the relationship determined by the equation ##EQU1## The coil may also include additional electrically conductive winding turns for compensating for variations in the linearity of the magnetic field gradient which are due to the coil being of finite length. Coils in accordance with the instant invention may be utilized to provide an improved nuclear magnetic resonance imaging and analysis system.
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Proceedings of an International Symposium on NMR Imaging (Oct. 1-3, 1981) by Bottomley-"Instrumentation for Whole Body Imaging", pp. 25-31.
J. F. Schenck et al., "Formulation of Design Rules for NMR Imaging Coil by Using Symbolic Manipulation", Proceedings of the 1981 ACM Symposium on Symbolic and Algebraic Computation, pp. 85-93, Association for Computing Machinery, New York (1981).
W. R. Smythe, Static and Dynamic Electricity, (3rd Ed.), pp. 180, 291 and 335, McGraw-Hill, New York (1968).
M. W. Garrett, "Thick Cylindrical Coil Systems for Strong Magnetic Fields with Field or Gradient Homogeneities of the 6th to 20th Order," Journal of Applied Physics, vol. 38, No. 6, pp. 2563-2586 (1967).
W. D. MacMillan, The Theory of the Potential, pp. 371-373, Dover, New York (1958).
Davis Jr. James C.
General Electric Company
Krauss Geoffrey H.
Kreitman Stephen A.
Oldham Scott M.
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