Coronary magnetic resonance angiography using motion matched acquisition
AssigneeCornell Research Foundation, Inc.
InventorYi Wang
Life of this patent
Estimating the term…
Abstract
Coronary arteries are imaged using a cardiac gated, 3DFT fast gradient recalled echo MRA pulse sequence. A scout scan is performed to measure motion during a cardiac or respiratory cycle and a quiescent period of minimal artery motion is identified. Image data is acquired during a succession of cardiac cycles, and the view order is selected to sample the center of k-space during the quiescent period of each cardiac and or respiratory cycle to reduce motion artifacts.
Claims11
A method for imaging arteries using an MRA pulse sequence in which a series of views are acquired to sample k-space, the steps comprising:
- a) performing a scout scan using an NMR pulse sequence to measure movement of the arteries during a cardiac cycle;
- b) identifying a quiescent period during the cardiac cycle in which the measured artery movement is minimal;
- and
- c) acquiring the views from which an image is reconstructed using the MRA pulse sequence over a succession of cardiac cycles, and arranging the view order in this acquisition such that the views which sample a central region of k-space are acquired during the quiescent periods of the cardiac cycles and views which sample peripheral regions of k-space are acquired during portions of the cardiac cycles outside the quiescent periods of the cardiac cycles.
A method for imaging patient arteries with an MRI system using an MRA pulse sequence in which a series of views are acquired to sample k-space, the steps comprising:
- a) performing a scout scan using an NMR pulse sequence to measure movement of the arteries during an acquisition window;
- b) dividing the acquisition window into a plurality of time segments including a quiescent time segment during which there is minimal arterial motion;
- c) producing a view order table by mapping each time segment to a corresponding region of k-space to be sampled and wherein the quiescent time segment is mapped to a central region of k-space and another time segment is mapped to a peripheral region of k-space;
- d) acquiring image data using the MRA pulse sequence during a series of acquisition windows, wherein each region of k-space is sampled during its corresponding time segment in each acquisition window.
Dependencies are inferred from the claim text.