Adaptive diffusion priors for accelerated MRI reconstruction

Deep MRI reconstruction is commonly performed with conditional models that de-alias undersampled acquisitions to recover images consistent with fully-sampled data. Since conditional models are trained with knowledge of the imaging operator, they can show poor generalization across variable operators...

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Main Authors: Güngör, Alper (Author) , Dar, Salman Ul Hassan (Author) , Öztürk, Şaban (Author) , Korkmaz, Yilmaz (Author) , Bedel, Hasan A. (Author) , Elmas, Gokberk (Author) , Ozbey, Muzaffer (Author) , Çukur, Tolga (Author)
Format: Article (Journal)
Language:English
Published: August 2023
In: Medical image analysis
Year: 2023, Volume: 88, Pages: 1-16
ISSN:1361-8423
DOI:10.1016/j.media.2023.102872
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.media.2023.102872
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S1361841523001329
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Author Notes:Alper Güngör, Salman UH Dar, Şaban Öztürk, Yilmaz Korkmaz, Hasan A. Bedel, Gokberk Elmas, Muzaffer Ozbey, Tolga Çukur

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520 |a Deep MRI reconstruction is commonly performed with conditional models that de-alias undersampled acquisitions to recover images consistent with fully-sampled data. Since conditional models are trained with knowledge of the imaging operator, they can show poor generalization across variable operators. Unconditional models instead learn generative image priors decoupled from the operator to improve reliability against domain shifts related to the imaging operator. Recent diffusion models are particularly promising given their high sample fidelity. Nevertheless, inference with a static image prior can perform suboptimally. Here we propose the first adaptive diffusion prior for MRI reconstruction, AdaDiff, to improve performance and reliability against domain shifts. AdaDiff leverages an efficient diffusion prior trained via adversarial mapping over large reverse diffusion steps. A two-phase reconstruction is executed following training: a rapid-diffusion phase that produces an initial reconstruction with the trained prior, and an adaptation phase that further refines the result by updating the prior to minimize data-consistency loss. Demonstrations on multi-contrast brain MRI clearly indicate that AdaDiff outperforms competing conditional and unconditional methods under domain shifts, and achieves superior or on par within-domain performance. 
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