Non-contrast dynamic MRI myocardial perfusion analysis and visualization
First Claim
Patent Images
1. A computerized system for displaying images acquired by magnetic resonance (MR) imaging, said system comprising:
- at least one computer processor coupled to associated memory, display and input/output ports and configured to;
(a) acquire separate 3D multi-slice non-contrast reconstructed MR images of blood perfusion within left ventricle (LV) myocardium for each of plural inversion time (TI) intervals during a same cardiac phase;
(b) perform segmentation of each of the 3D multi-slice non-contrast reconstructed MR images; and
(c) display, to an operator of said system, separate LV slice reconstructed images of blood perfusion at each of plural slice positions from each of the 3D multi-slice non-contrast reconstructed MR images on which the segmentation has been performed, for each of said plural TI time intervals, in sequences of respectively corresponding LV slice reconstructed images of blood perfusion at each of said plural slice positions, as a function of the TI time intervals, simultaneously in a single display panel, in a color map format for each segment resulting from the segmentation.
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Abstract
Black blood time to inversion (BBTI) tag-on and tag-off images acquired by magnetic resonance imaging (MRI) are analyzed to produce difference magnitude 3D images as a function of time (BBTI values) representing blood perfusion in a region of interest (ROI). Perfusion data of the ROI having values which are different for normal and abnormal myocardial tissues are displayed for plural slices of a 3D image and for plural BBTI values in a single display panel.
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Citations
26 Claims
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1. A computerized system for displaying images acquired by magnetic resonance (MR) imaging, said system comprising:
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at least one computer processor coupled to associated memory, display and input/output ports and configured to; (a) acquire separate 3D multi-slice non-contrast reconstructed MR images of blood perfusion within left ventricle (LV) myocardium for each of plural inversion time (TI) intervals during a same cardiac phase; (b) perform segmentation of each of the 3D multi-slice non-contrast reconstructed MR images; and (c) display, to an operator of said system, separate LV slice reconstructed images of blood perfusion at each of plural slice positions from each of the 3D multi-slice non-contrast reconstructed MR images on which the segmentation has been performed, for each of said plural TI time intervals, in sequences of respectively corresponding LV slice reconstructed images of blood perfusion at each of said plural slice positions, as a function of the TI time intervals, simultaneously in a single display panel, in a color map format for each segment resulting from the segmentation.
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2. A computerized system for analyzing inversion time (TI) tag-on and tag-off non-contrast images acquired by magnetic resonance imaging (MM) during a same cardiac phase, said system comprising:
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at least one computer processor coupled to associated memory, display and input/output ports and configured to; (a) subtract tag-off and tag-on images, each of the tag-off images and each of the tag-on images having been acquired during a same cardiac phase in relation to respective electrocardiogram (ECG) signals and using multi-slice non-contrast imaging, on a pixel-by-pixel basis using both real and imaginary parts of complex-valued acquired MM signals for each of plural TI time intervals to produce difference magnitude 3D images for a 3D volume as a function of the TI time intervals, said difference magnitude 3D images representing blood perfusion in left ventricle (LV) myocardium tissue with blood perfusion data values which are different for normal and abnormal myocardial tissues; and (b) display separate LV slice reconstructed MR images of said difference magnitude 3D images for each of plural different slices of said 3D volume at plural of the TI time intervals simultaneously in a single display panel. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A computerized method for analyzing inversion time (TI) tag-on and tag-off non-contrast images acquired by magnetic resonance imaging (MM) during a same cardiac phase, said method comprising:
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(a) subtracting, using at least one computer processor coupled to associated memory, display and input/output ports, tag-off and tag-on images, each of the tag-off images and each of the tag-on images having been acquired during a same cardiac phase in relation to respective electrocardiogram (ECG) signals and using 3D multi-slice non-contrast imaging, on a pixel-by-pixel basis using both real and imaginary parts of complex-valued acquired MRI signals for each of plural TI time intervals to produce difference magnitude 3D images of a 3D volume as a function of the TI time intervals, said difference magnitude 3D images representing blood perfusion in left ventricle (LV) myocardium tissue with data values which are different for normal and abnormal myocardial tissues; (b) performing segmentation, using the at least one computer processor, of each of the difference magnitude 3D images producing respective segmented difference magnitude 3D image corresponding to each said difference magnitude 3D image; and (c) displaying separate LV slice reconstructed MR images of plural different slices in each of said segmented difference magnitude 3D images at plural of the TI time interval values simultaneously in a single display panel, in a color map format for each segment resulting from the segmentation. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A magnetic resonance imaging (MM) system comprising:
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an MRI gantry having static and gradient magnet assemblies and at least one radio frequency (RF) coil; MRI control circuits connected to control components within said MRI gantry and configured to effect MRI data acquisition sequences of RF and gradient magnetic pulses which elicit MM signals, to acquire and process said elicited MM signals into MR image data in conjunction (a) with use of an initial spatially-selective nuclear magnetic resonance (NMR) RF tag pulse (tag-on) in a data acquisition sub-sequence and (b) without use of an initial spatially-selective NMR RF tag pulse (tag-off) in a data acquisition sub sequence; said MM control circuits being configured to (A) acquire multi-dimensional MR k-space data from the elicited MRI signals using said tag-on and tag-off data acquisition sub-sequences for each of plural time to inversion (TI) time intervals during a same cardiac phase without using an injected contrast agent; (B) reconstruct said acquired k-space data into spatial domain tag-on and tag-off MR image data, each of the tag-off MR image data and each of the tag-on MR image data having been acquired during a same cardiac phase in relation to respective electrocardiogram (ECG) signals and using 3D multi-slice imaging; (C) subtract said reconstructed tag-off and tag-on MR image data for each of plural TI time intervals using both real and imaginary parts of complex-valued acquired MRI signals from the elicited MM signals to produce difference magnitude 3D image data as a function of time having a corresponding blood flow time and/or relative peak blood flow magnitude, or lack thereof, which differentiates between normal, ischemic and infarct tissues; (D) perform segmentation of each of the difference magnitude 3D image data; and (E) concurrently display plural separate left ventricle (LV) slice reconstructed MR images of said difference magnitude 3D image data on which the segmentation has been performed, for each of plural slices of a 3D volume as visually different display data values (a) for normal, ischemic and infarct tissues based on said difference magnitude 3D image data and (b) at the plural TI time intervals simultaneously in a single display panel, in a color map format for each segment resulting from the segmentation. - View Dependent Claims (23, 24, 25, 26)
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Specification