Adaptive acquisition and reconstruction of dynamic MR images
AssigneeThe Board of Trustees of the University of Illinois
InventorsNitin Aggarwal, Saptarshi Bandyopadhyay, Yoram Bresler
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Abstract
A method for acquiring MR data from a beating heart during subject respiration includes a prescan phase in which a respiratory compensation table and a k-space sampling schedule are produced. The k-space sampling table is produced using a spatio-temporal model of the beating heart and time sequential sampling theory. During the subsequent scan an imaging pulse sequence which is prospectively compensated for respiratory motion is used to acquire k-space data from the subject. The imaging pulse sequence is repeated to play out the phase encodings in the order listed in the k-space sampling schedule.
Claims29
A method for acquiring and producing images of a time-varying subject with a magnetic resonance imaging (MRI) system, the steps comprising:
- a) performing a prescan of the time-varying subject that includes:
- a)i) estimating a dynamic model for the time-varying subject;
- a)ii computing a dynamic sampling schedule using the estimated dynamic model, the sampling schedule including information indicative of the position in k-space, order and timing at which k-space image data is to be acquired;
- and
- a)iii selecting a pulse sequence for directing the MRI system to acquire k-space image data from the time-varying subject;
- b) performing a scan of the time-varying subject to acquire k-space image data with the MRI system that includes:
- b)i acquiring information indicative of the motion of the subject caused by respiration;
- b)ii altering during the scan one of the dynamic sampling schedule or the selected pulse sequence to compensate for respiratory motion of the subject;
- and
- b)iii acquiring k-space image data with the MRI system using the sampling schedule and the selected pulse sequence;
- and
- c) reconstructing an image using k-space image data acquired in step b).
A method for acquiring and producing an image of a time-varying subject with a magnetic resonance imaging (MRI) system, the steps comprising:
- a) performing a prescan of the time-varying subject that includes:
- a)i) estimating a dynamic model for the time-varying subject;
- a)ii producing a dynamic sampling schedule using the estimated dynamic model, the dynamic sampling schedule including information indicative of the position in k-space, order and timing at which k-space image data is to be acquired;
- b) performing a scan of the time-varying subject to acquire k-space image data using the MRI system that includes:
- b)i acquiring information indicative of the motion of the subject during the scan caused by respiration;
- b)ii acquiring k-space image data with the MRI system in accordance with the dynamic sampling schedule;
- and
- c) reconstructing an image using the k-space image data acquired in step b)ii) and the subject motion information acquired in step b)i).
A method for acquiring and producing an image of a subject with a magnetic resonance imaging (MRI) system, the steps comprising:
- a) selecting a pulse sequence and a sampling schedule for directing the MR system to acquire k-space image data from the subject at designated times and k-space locations indicated by the sampling schedule;
- b) performing a scan of the subject to acquire k-space image data with the MRI system that includes:
- b)i acquiring information indicative of the motion of the subject caused by respiration;
- b)ii acquiring k-space data by operating the MRI system with the selected pulse sequence and in accordance with the sampling schedule,
- c) producing corrected k-space image data by altering the acquired k-space data to compensate for volumetric changes in the subject caused by respiration, using the motion information acquired in step b)i;
- d) reconstructing an image using the corrected k-space image data.
Dependencies are inferred from the claim text.