Abstract
Simultaneous positron emission tomography (PET) and magnetic resonance imaging (MRI) provide complementary information about brain function and structure. Joint reconstruction of MRI and PET images can improve image quality in both modalities, potentially enabling faster MRI and lower-dose PET scans. Current methods for joint MRI-PET reconstruction use priors that model inter-modality dependencies in image gradients. Many methods also ignore the potential in parallel MRI for acceleration. In contrast, we combine accelerated parallel MRI with a joint MRI-PET patch-based dictionary model to infer higher-order dependencies across MRI and PET image neighborhoods. We propose a novel Bayesian framework for joint MRI-PET reconstruction. The results show that our method reconstructs images more accurately, in simulated and in vivo MRI-PET (in parallel MRI) cases, than the state of the art.
Thanks to the Infrastructure Facility for Advanced Research and Education in Diagnostics grant funded by the Department of Biotechnology of the Government of India (RD/0117-DBT0000-002); Reignwood Cultural Foundation; Australian Research Council Linkage grant LP170100494. Thanks to Kamlesh Pawar and Shenpeng Li from MBI for providing reconstructed images using the scanner software.
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Sudarshan, V.P., Gupta, K., Egan, G., Chen, Z., Awate, S.P. (2019). Joint Reconstruction of PET + Parallel-MRI in a Bayesian Coupled-Dictionary MRF Framework. In: Shen, D., et al. Medical Image Computing and Computer Assisted Intervention – MICCAI 2019. MICCAI 2019. Lecture Notes in Computer Science(), vol 11766. Springer, Cham. https://doi.org/10.1007/978-3-030-32248-9_5
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