Max-planck-gesellschaft Zur F&#xf6;rderung Der Wissenschaften E. V.

Axel Haase

Jens Frahm

Klaus-Dietmar Merboldt

Dieter Matthaei

Wolfgang Haenicke

A method and an apparatus for a locally resolved investigation of a speci, wherein the specimen is exposed to a constant magnetic field and a variable combination of three gradient magnetic fields directed substantially perpendicularly to each other and to a sequence of high-frequency (RF) pulses which contains three successive pulses with flip angles not equal to .vertline.m Pi.vertline., and signals corresponding to a magnetic resonance of spin moments, in particular nuclear spin moments in said specimen are detected. The interval (tau) between the first and the second pulse is greater than T.sub.2eff and smaller than 5T.sub.2, and that the interval (T-tau) between the second and the third pulse is greater than T.sub.2eff and smaller than 5T.sub.1, wherein

Imaging magnetic spin resonance method and apparatus

A circuit arrangement is described for preventing a reaction of a coil on an external high-frequency field of predetermined frequency containing the coil due to a current induced by the field in the coil for a multiple-coil probe of a nuclear magnetic resonance apparatus wherein the coil is coupled via a high-frequency line of predetermined characteristic impedance to a switching element and a circuit unit cooperating with the coil. The electrical length of the high-frequency line between the coil and the switching element is so dimensioned that any undesired reaction of an inactive coil on the other coil(s) is eliminated.

Decoupling multiple-coil NMR probes

A fast low angle shot ('FLASH') NMR method is described, which uses radio frequency excitation pulses having a flip angle substantially less than 90 degrees, and subsequent reading gradient reversal for producing a gradient echo signal. The small flip angle pulses create an equilibrium state between longitudinal and transverse magnetization, which allows to apply the radio frequency pulses repeatedly with high repetition rate to produce gradient echo signals of essentially equal strength, without any intervening delay for magnetization restoration or recovery.

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Goettingen, Germany

Axel Haase