System for suppression of artifacts in MR imaging

摘要

An MR system acquires, over multiple heart cycles, image datasets representing multiple image slices of an anatomical region of interest of a patient. In the device, an RF signal generator and a magnetic field gradient generator provides an RF pulse and magnetic field gradient sequence for RF signal excitation of the region of interest and for acquiring RF data following the signal excitation. The sequence comprises, a first sequence occurring substantially immediately after the acquisition of image data using a readout magnetic field gradient. The first sequence includes an RF pulse with a predetermined flip angle followed by a magnetic field gradient pulse for reducing field magnetization to substantially zero. The first sequence is preceded by a dummy acquisition sequence comprising the elements of the first sequence except substantially without acquisition of data.

主权项

1. A system for suppressing artifacts arising from long longitudinal relaxation time (T1) of tissue, fluids, or other matter in MR imaging, comprising:
an MR image acquisition device for acquiring, over a plurality of consecutive data acquisition periods, image datasets representing one or more image slices of an anatomical region of interest of a patient, comprising: an RF (Radio Frequency) signal generator and a magnetic field gradient generator for providing an image data acquisition sequence, said image data acquisition sequence comprising:
for each period of the plurality of consecutive data acquisition periods:
an RF excitation signal for excitation of said anatomical region of interest;a data readout following said RF excitation signal for image data acquisition; anda first sequence occurring substantially immediately after the data readout, said first sequence including an RF pulse with a predetermined flip angle followed substantially immediately by a magnetic field gradient pulse for reducing field magnetization of said anatomical region of interest to substantially zero, anda dummy acquisition sequence preceding a first one of the plurality of consecutive data acquisition periods, comprising said RF excitation signal and said first sequence, without acquisition of image data.