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MACHINE LEARNING FOR SIMULTANEOUSLY OPTIMIZING AN UNDER-SAMPLING PATTERN AND A CORRESPONDING RECONSTRUCTION MODEL IN COMPRESSIVE SENSING
MACHINE LEARNING FOR SIMULTANEOUSLY OPTIMIZING AN UNDER-SAMPLING PATTERN AND A CORRESPONDING RECONSTRUCTION MODEL IN COMPRESSIVE SENSING
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机译:同时优化压缩感测中的欠采样模式和对应重构模型的机器学习
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摘要
Systems and methods are disclosed for optimizing a sub-sampling pattern for efficient capture of a sub-sampled image to be reconstructed to form a high-resolution image, in a data-driven fashion. For example, Magnetic Resonance Imaging (MRI) scans can be accelerated by under-sampling in k-space (i.e., the Fourier domain). Since the reconstruction model's success depends on the sub-sampling pattern, optimization of the sub-sampling pattern can be combined with optimization of the model, for a given sparsity constraint, using an end-to-end learning operation. A machine-learning model may be trained using full-resolution training data that are under-sampled retrospectively, yielding a sub-sampling pattern and reconstruction model that are customized to the type of images represented in the training data. The disclosed Learning-based Optimization of the Under-sampling PattErn (LOUPE) operations may implement a convolutional neural network architecture, appended with a forward model that encodes the under-sampling process.
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