SYSTEM AND METHOD FOR GRADIENT-MODULATED SWEEP IMAGING WITH FOURIER TRANSFORMATION MAGNETIC RESONANCE IMAGING

摘要

Described here are systems and methods for magnetic resonance imaging (“MRI”) using a sweeping frequency excitation applied during a time-varying magnetic field gradient. As an example, a gradient-modulated offset independent adiabaticity (“GOIA”) approach can be used to modify the pattern of the sweeping frequency excitation. Data are acquired as time domain signals and processed to generate images. As an example, the time domain signals are processed using a correlation between a Fourier transform of the gradient-modulated sweeping frequency excitation and a Fourier transform of the time domain signals.

主权项

1. A method for producing an image of a subject with a magnetic resonance imaging (MRI) system, the steps of the method comprising:
directing the MRI system to perform a pulse sequence that includes:
applying a sweeping frequency excitation having a duration, the sweeping frequency excitation being configured to sequentially excite spins having different resonance frequencies;applying a time-varying magnetic field gradient in a constant direction during the duration, the time-varying magnetic field being configured to impart a different phase accumulation to spins having different resonance frequencies;acquiring a time domain signal during the duration, the time domain signal being based on evolution of the spins; and generating data for display from the acquired time domain signal.