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Iterative PET Image Reconstruction Using Convolutional Neural Network Representation


3D Reconstruction in Canonical

Scalable and Secure Big Data I

A Wavelet-Predominant Algorith
Abstract


PET image reconstruction is challenging due to the illposeness of the inverse problem and limited number of detected photons. Recently deep neural networks have been widely and successfully used in computer vision tasks and attracted growing interests in medical imaging. In this work, we trained a deep residual convolutional neural network to improve PET image quality by using the existing interpatient information. An innovative feature of the proposed method is that we embed the neural network in the iterative reconstruction framework for image representation, rather than using it as a postprocessing tool. We formulate the objective function as a constrained optimization problem and solve it using the alternating direction method of multipliers (ADMM) algorithm. Both simulation data and hybrid real data are used to evaluate the proposed method. Quantification results show that our proposed iterative neural network method can outperform the neural network denoising and conventional penalized maximum likelihood methods.

KeyWords
Positron emission tomography, Convolutional neural network, iterative reconstruction



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