Three dimensional magnetic resonance motion estimation on a single image plane
First Claim
1. A method of measuring three-dimensional motion of an object by magnetic resonance imaging from one acquired image orientation, comprising:
- applying a magnetic resonance imaging pulse sequence to spatially modulate a region of interest of said object, the pulse sequence comprising a slice-following CSPAMM (complementary spatial modulation of magnetization) pulse sequence with added z-phase encode;
acquiring a set of one or more vertically tagged images and a set of one or more horizontally tagged images of said spatially modulated object; and
determining in-plane and through-plane motions of said spatially modulated object from the vertically and horizontally tagged images.
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Abstract
Three-dimensional MR motion estimation on a single image plane based on tagged MRI and HARP processing. Tagged magnetic resonance imaging technique encodes and automatically tracks displacement of spatially modulated object in three dimensions, encoding both in plane and through-plane motion in a single image plane without affecting acquisition speed. Post-processing unravels encoding in order to directly track 3-D displacement of points within the image plane throughout image sequence. The invention is particularly suited to use on a heart for tracking and determining myocardial displacement. In one embodiment, an MR pulse sequence extends a slice following complementary spatial modulation of magnetization (CSPAMM) pulse sequence with two small z-encoding gradients immediately before the readouts in successive CSPAMM acquisitions, thereby adding a through-plane encoding from which through-plane motion can be computed from acquired images. HARP processing is used to determine in-plane motion, after which through-plane position can be determined using phase encodings. Use of balanced encodings and horizontal and vertical tags permits cancellation of systematic phase artifacts present in CSPAMM acquisitions.
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Citations
14 Claims
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1. A method of measuring three-dimensional motion of an object by magnetic resonance imaging from one acquired image orientation, comprising:
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applying a magnetic resonance imaging pulse sequence to spatially modulate a region of interest of said object, the pulse sequence comprising a slice-following CSPAMM (complementary spatial modulation of magnetization) pulse sequence with added z-phase encode;
acquiring a set of one or more vertically tagged images and a set of one or more horizontally tagged images of said spatially modulated object; and
determining in-plane and through-plane motions of said spatially modulated object from the vertically and horizontally tagged images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of measuring three-dimensional motion of an object by magnetic resonance imaging from one acquired image orientation, comprising:
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applying a magnetic resonance imaging pulse sequence to spatially modulate a region of interest of said object, the pulse sequence comprising a slice-following CSPAMM (complementary spatial modulation of magnetization) pulse sequence with added z-phase encode;
acquiring a set of one or more of grid tagged images of said spatially modulated object; and
determining in-plane and through-plane motions of said spatially modulated object from the grid tagged images.
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Specification