Method for fast scan cine NMR imaging
First Claim
1. A method for producing an image with an NMR imaging system which depicts an object at a selected phase of its functional cycle, the steps comprising:
- (a) repeatedly executing an NMR pulse sequence throughout a functional cycle to acquire a subset of NMR data, said execution being asynchronous with respect to said functional cycle to produce NMR data at each of a plurality of phases of the functional cycle, and said NMR pulse sequence including a position encoding gradient pulse;
(b) correlating the NMR data acquired during the execution of each NMR pulse sequence with the phase of the functional cycle at the time the NMR data is acquired;
(c) repeating steps (a) and (b) for a plurality of functional cycles with a different position encoding gradient pulse employed during each functional cycle to produce other subsets of NMR data;
(d) reconstructing an image at a selected phase of the functional cycle by interpolating between NMR data within each subset of acquired NMR data to produce a set of interpolated NMR data which is employed to produce the image.
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Abstract
An NMR method for producing a sequence of images throughout the cardiac cycle is disclosed. A fast scan NMR pulse sequence is continuously and asynchronously applied during successive cardiac cycles, and a phase encoding magnetic field gradient is incremented between cardiac cycles to acquire NMR data which is reconstructed using a 2DFT technique. The phase encoding magnetic field gradient is stepped in subincrements, and the odd and even phase encoding views are acquired in separate segments of the procedure in order to eliminate image distortion due to disturbance of the residual transverse magnetization.
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Citations
16 Claims
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1. A method for producing an image with an NMR imaging system which depicts an object at a selected phase of its functional cycle, the steps comprising:
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(a) repeatedly executing an NMR pulse sequence throughout a functional cycle to acquire a subset of NMR data, said execution being asynchronous with respect to said functional cycle to produce NMR data at each of a plurality of phases of the functional cycle, and said NMR pulse sequence including a position encoding gradient pulse; (b) correlating the NMR data acquired during the execution of each NMR pulse sequence with the phase of the functional cycle at the time the NMR data is acquired; (c) repeating steps (a) and (b) for a plurality of functional cycles with a different position encoding gradient pulse employed during each functional cycle to produce other subsets of NMR data; (d) reconstructing an image at a selected phase of the functional cycle by interpolating between NMR data within each subset of acquired NMR data to produce a set of interpolated NMR data which is employed to produce the image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of producing an image with an NMR imaging system which depicts an object at a selected phase of its functional cycle, the steps comprising:
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(a) repeatedly executing an NMR pulse sequence throughout a plurality of functional cycles to produce NMR data, wherein said execution is asynchronous with respect to said functional cycles, wherein each NMR pulse sequence includes a position encoding gradient pulse characterized by a value, and wherein said value is altered during said repeated executions; (b) correlating the NMR data acquired during the execution of each NMR pulse sequence with the phase of the functional cycle at the time the data was acquired and the value of the position encoding gradient used; (c) generating an NMR data set for the selected phase of the functional cycle and a plurality of values of the position encoding gradient pulse by interpolation between measured NMR data, said interpolation using the known phase of the functional cycle at the time each pulse sequence was executed; and (d) producing an image at the selected phase of the functional cycle using the NMR data generated in step (c). - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification