Magnetic resonance method and system to generate an optimized MR image of an examination subject

摘要

A magnetic resonance method and system for generation of an optimized MR image of an examination subject operate as follows. A pulse sequence including a series of at least two RF pulses is radiated into the examination subject to generate at least one optimized signal, wherein the second and possibly every additional RF pulse is radiated before the effect of the first or a preceding RF pulse on the spin system in the examination subject has decayed. The radiated RF pulses are generated by parallel transmission coils. At least the signal resulting after the last radiated RF pulse of the pulse sequence is acquired. The pulse sequence is repeated with modified spatial coding until signals have been generated and acquired in a desired positional space. The optimized MR image per pulse sequence is calculated from at least one of the acquired signals.

主权项

1. A method for generating an optimized magnetic resonance image of an examination subject, comprising:
placing an examination subject in a magnetic resonance data acquisition unit comprising a plurality of radio frequency (RF) transmission coils; operating said plurality of RF transmission coils in parallel to radiate at least two RF excitation pulses into the examination subject in the data acquisition unit, that each excite nuclear spins in the subject to cause emission of at least one magnetic resonance signal from the nuclear spins in the subject that have been excited by said at least two RF excitation pulses, with at least a second of said RF excitation pulses being radiated before an effect on said nuclear spins of a preceding RF excitation pulse in said series of at least two RF excitation pulses has subsided, so that said at least one magnetic resonance signal comprises signal contributions from nuclear spins excited by said preceding RF excitation pulse and nuclear spins excited by said at least a second of said RF excitation pulses; selecting at least said preceding RF excitation pulse and said at least a second of said RF excitation pulses to cause said signal contributions to give said magnetic resonance signal a selected optimization as an optimized magnetic resonance signal; spatially encoding said at least one optimized signal with a spatial coding; detecting the at least one optimized and spatially coded magnetic resonance signal with a reception antenna of said data acquisition unit; repeating radiation of said sequence and modifying said spatial coding with each repetition until all signals have been generated and acquired in a predetermined region of the examination subject; and in a processor, calculating a magnetic resonance image for each pulse sequence from at least one of the acquired signals, said magnetic resonance image having an image content that is a result of said selected optimization given to said optimized magnetic resonance signal.