Method for producing a time-resolved series of 3D magnetic resonance angiograms during the first passage of contrast agent
DCFirst Claim
1. A method for acquiring NMR data from a subject after iniection of a contrast agent to produce a series of frame images depicting the passage of contrast agent through a region of interest in the subject by repeatedly acquiring samples from a corresponding k-space during a dynamic study of the subject, the steps comprising:
- sampling a central region of k-space at intervals during the dynamic study at a selected temporal rate;
sampling peripheral regions of k-space at intervals during the dynamic study at a lower temporal rate;
producing a series of data sets by forming a data set for each central region k-space sampling, which includes said central region k-space samples and samples derived from temporally adjacent samplings of the peripheral k-space regions; and
reconstructing the series of frame images from the series of data sets.
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Abstract
A dynamic MRA study of a subject is performed using a 3D fast gradient-recalled echo pulse sequence. The frame rate of the resulting series of reconstructed images is increased by sampling a central region of k-space at a higher rate than the peripheral regions of k-space. Image frames are reconstructed at each sampling of the central k-space region using the temporally nearest samples from the peripheral k-space regions.
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Citations
23 Claims
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1. A method for acquiring NMR data from a subject after iniection of a contrast agent to produce a series of frame images depicting the passage of contrast agent through a region of interest in the subject by repeatedly acquiring samples from a corresponding k-space during a dynamic study of the subject, the steps comprising:
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sampling a central region of k-space at intervals during the dynamic study at a selected temporal rate; sampling peripheral regions of k-space at intervals during the dynamic study at a lower temporal rate; producing a series of data sets by forming a data set for each central region k-space sampling, which includes said central region k-space samples and samples derived from temporally adjacent samplings of the peripheral k-space regions; and reconstructing the series of frame images from the series of data sets. - View Dependent Claims (2, 3, 4, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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5. A method for acquiring NMR data from a subject to produce a series of frame images by repeatedly acquiring samples from a selected k-space during a dynamic study of a three-dimensional region of the subject, the steps comprising:
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sampling a central region of the selected k-space at a temporal rate; sampling peripheral regions of the selected k-space at a lower temporal rate; forming a data set for each set of central region k-space samples, which includes said central region k-space samples and samples derived from the most temporally adjacent samplings of the peripheral k-space regions; and reconstructing a three-dimensional frame image from each data set, and; in which a further three-dimensional image is produced by subtracting one of said three-dimensional frame images from another one of said three-dimensional frame images. - View Dependent Claims (6)
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10. A method for acquiring NMR data from a subject to produce a series of frame images by repeatedly acquiring samples from a selected k-space during a dynamic study of the subject, the steps comprising:
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sampling a central region of the selected k-space at a temporal rate; sampling peripheral regions of the selected k-space at a lower temporal rate; forming a data set for each set of central region k-space samples, which includes said central region k-space samples and samples derived from the most temporally adjacent samplings of the peripheral k-space regions; and reconstructing a frame image from each data set; and in which there are three different peripheral k-space regions and the k-space is repeatedly sampled during the dynamic study by alternately sampling the central k-space region and one of the three different peripheral k-space regions.
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Specification