MRI METHODS AND APPARATUS FOR FLEXIBLE VISUALIZATION OF ANY SUBSET OF AN ENLARGED TEMPORAL WINDOW
First Claim
1. A method for controlling a magnetic resonance (MR) imaging system to provide retrospective reconstruction of an object image of a four-dimensional (4D) volume by an optimized rotation angle, the method comprising:
- acquiring a temporal acquisition window based on an associated motion period of the object image,acquiring a plurality of image slices of the object, in which each kz plane is repeatedly determined during a sub-window of the temporal acquisition window;
in response to a request, selecting a temporal acquisition sub-window for retrospective processing of the image slices to determine a period of minimal objection motion within the acquired temporal window.
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Abstract
A method and apparatus for MRI retrospective reconstruction determines a period of minimal coronary artery motion within the acquired temporal window with a rotation angle optimized for a K-space four-dimensional (4D) volume by a segmented 4D radial stack-of-stars (SOS) acquisition during a temporal acquisition window (taw). Radial stacks of the image of an object are acquired by performing the radial (SOS) acquisition to determine a plurality of kz plane samples of the object, in which each kz plane is repeatedly determined during a sub-window of the temporal acquisition window. Consecutive volumes of kz centric slices of the image at each temporal sub-window of the temporal acquisition window are generated and summed to fill a 3D k-space volume. The radial (SOS) acquisition of the image is determined utilizing a customized rotation angle θ providing a uniform distribution of k-space spokes of the kz centric slices for each sub-window of the (taw).
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Citations
31 Claims
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1. A method for controlling a magnetic resonance (MR) imaging system to provide retrospective reconstruction of an object image of a four-dimensional (4D) volume by an optimized rotation angle, the method comprising:
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acquiring a temporal acquisition window based on an associated motion period of the object image, acquiring a plurality of image slices of the object, in which each kz plane is repeatedly determined during a sub-window of the temporal acquisition window; in response to a request, selecting a temporal acquisition sub-window for retrospective processing of the image slices to determine a period of minimal objection motion within the acquired temporal window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for controlling a magnetic resonance (MR) imaging system to provide interactive visualization of 4D MRI imaging for flexible gridding image reconstruction by a Graphics Processing Unit (GPU) for lag-free performance, the method comprising:
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forwarding selected k-space points and coordinates from a selected slice of an image of an object and temporal window to a GPU reconstruction and visualization engine executed by the GPU comprising circuitry configured by machine executable code that is executed by the GPU for operation; performing by the GPU rapid gridding on a per-point basis of the selected slice of the image of an object by indexing raw k-space data into kx, ky, kz and t coordinates; processing by the GPU a 2D image according to input parameters including the kx, ky, kz and t coordinates mounted onto a GPU memory; performing by the GPU a gridding operation on a per-point basis and accumulating gridded data from each GPU kernel onto a final Cartesian grid; performing by the GPU an image reconstruction sequence, and mounting the reconstructed image back to a CPU memory for display by a display device. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method for controlling a magnetic resonance (MR) imaging system to address an inaccurate trigger delay derived from Scout Cine Steady State Free Precession (SSFP) in a whole-heart coronary MRI with an enlarged acquisition window, the method comprising:
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setting an enlarged acquisition window in accordance with a subject'"'"'s observed heart rate; determining a subject-specific trigger delay from an initial breath-held 2D cine at a beginning of an imaging protocol; adjusting the subject-specific trigger delay to begin a predetermined time prior to a determined quiescent period from a scout cine scan; performing a radial stack-of-stars scan of a whole heart coronary sequence; performing k-space sampling over the enlarged acquisition window; reconstructing offline images of the subject for display by a display device in which a temporal reconstruction window is optimized in response to user selected adjustment of the offline images of the subject being displayed by the display device. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. An apparatus for providing flexible visualization of any subset of an enlarged temporal window of Magnetic Resonance (MR) imaging, the apparatus comprising:
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an image generating unit including a Graphics Processing Unit (GPU); a user interface that detects input from an operator the of the apparatus; an image outputting unit including a display screen that displays an image of a temporal acquisition window of MR generated by the image generating unit; and a control unit configured to control at least the image generating unit, image outputting unit and the user interface, wherein in response to selection or input via the user interface, the control unit controls the image generating unit to generate reconstruction windows with a stack-of-stars acquisition and interleaving of radial stacks of MR images utilizing a customized rotation angle θ
to provide a uniform distribution of k-space spokes of kz centric slices of a scanned image for each sub-window of a temporal acquisition window, andthe control unit is configured to process retrospectively a determination of a period of minimal coronary artery motion within an acquired temporal window in response to a request via the user interface. - View Dependent Claims (29, 30, 31)
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Specification