Method for dynamic prior image constrained image reconstruction
First Claim
1. A method for reconstructing an image of a subject with an imaging system, the steps comprising:
- a) acquiring, with the imaging system, a time series of image data of the subject;
b) selecting an estimate image of the subject;
c) reconstructing a prior image of the subject from the time series of image data acquired in step a);
d) producing a sparsified image of the subject using the prior image and the estimate image; and
e) reconstructing a desired image of the subject using the sparsified image, the estimate image, and the acquired time series of image data.
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Abstract
A method for reconstructing a high quality image from undersampled image data is provided. The image reconstruction method is applicable to a number of different imaging modalities. Specifically, the present invention provides an image reconstruction method that incorporates an appropriate prior image into the image reconstruction process. Thus, one aspect of the present invention is to provide an image reconstruction method that requires less number of data samples to reconstruct an accurate reconstruction of a desired image than previous methods, such as, compressed sensing. Another aspect of the invention is to provide an image reconstruction method that produces a time series of desired images indicative of a higher temporal resolution than is ordinarily achievable with the imaging system. For example, cardiac phase images can be produced with high temporal resolution (e.g., 20 milliseconds) using a CT imaging system with a slow gantry rotation speed.
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Citations
20 Claims
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1. A method for reconstructing an image of a subject with an imaging system, the steps comprising:
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a) acquiring, with the imaging system, a time series of image data of the subject; b) selecting an estimate image of the subject; c) reconstructing a prior image of the subject from the time series of image data acquired in step a); d) producing a sparsified image of the subject using the prior image and the estimate image; and e) reconstructing a desired image of the subject using the sparsified image, the estimate image, and the acquired time series of image data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for reconstructing a time series of images of a subject with an imaging system, the steps comprising:
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a) acquiring, with the imaging system at a first temporal resolution, a time series of image data of the subject; b) selecting an estimate image of the subject; c) reconstructing a prior image of the subject from the time series of image data acquired in step a); d) producing a sparsified image of the subject using the prior image and the estimate image; and e) reconstructing a time series of desired images of the subject using the sparsified image, the estimate image, and the acquired time series of image data, wherein the time series of desired images of the subject is indicative of a second temporal resolution that is higher than the first temporal resolution. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification