Patent ID: 9057770
Filing Date: 2015-06-16
Classification: G01R

Abstract:
1. A method for acquiring magnetic resonance image data, comprising: operating a magnetic resonance data acquisition unit to, in each of a plurality of successive acquisition time frames, exciting nuclear spins in a subject located in the data acquisition unit by radiating an excitation pulse having a frequency duration, and temporally frequency modulating said excitation pulse to excite said nuclear spins in a temporal sequence within the respective acquisition time frame according to a non-linear frequency modulation function that defines said frequency modulation during said pulse duration, said non-linear frequency modulation function exhibiting at least one peak selected from the group consisting of a maximum peak and a minimum peak; operating said magnetic resonance data acquisition unit to generate at least one gradient field and giving said at least one gradient field a different gradient field orientation respectively in each of said acquisition time frames; operating said magnetic resonance data acquisition unit to detect, in each acquisition time frame, a magnetic resonance signal that arises from the excitation of nuclear spins in the respective acquisition time frame, thereby acquiring a plurality of time-resolved magnetic resonance signals; supplying said time-resolved magnetic resonance signals to a computerized processor and, in said computerized processor, automatically generating a projection image data record for each acquisition time frame by evaluation of the respective time-resolved magnetic resonance signal detected in the respective acquisition time frame; and in said computerized processor, reconstructing a magnetic resonance image by back projection of the respective projection image data records.