System and Method for Ungated Non-Contrast Enhanced Magnetic Resonance Angiography

摘要

A system and method for producing an image of a vasculature of a subject using a magnetic resonance imaging (MRI) system includes applying a saturation pulse to a prescribed imaging slice to substantially suppress MR signals in the prescribed imaging slice. A quiescent inflow time period (QITP) is observed that is at least equal to half a projected duration of a cardiac cycle of the subject. After the QITP, k-space data is acquired from the prescribed imaging slice, and a subset of the data representative of a desired portion of the cardiac cycle of the subject is reconstructed into an image of the subject including at least the prescribed imaging slice.

主权项

1. A method for producing an image of a vasculature of a subject using a magnetic resonance imaging (MRI) system, the steps comprising:
a) performing a pulse sequence that directs the MRI system to:
i) apply a radio frequency (RF) saturation pulse to a prescribed imaging slice to substantially suppress MR signals in the prescribed imaging slice;ii) observe a quiescent inflow time period (QITP) at least equal to a projected duration of a cardiac cycle of the subject;iii) apply an RF excitation pulse to the prescribed imaging slice;iv) acquire k-space data from the prescribed imaging slice following the application of the RF excitation pulse as a plurality of segments in which a time delay (TR) between sequential segments in the plurality of segments for the prescribed slice is at least equal to of a projected duration of the cardiac cycle of the subject; and b) determining a subset of the acquired k-space data which is representative of a desired portion of the cardiac cycle of the subject; and c) reconstructing, from the subset of acquired k-space data which is representative of the desired portion of the cardiac cycle, an image of the subject including at least the prescribed imaging slice over the desired portion of the cardiac cycle.