Deep MRI reconstruction with radial subsampling

George Yiasemis; Chaoping Zhang; Clara I. Sánchez; Jan-Jakob Sonke; Jonas Teuwen

doi:10.1117/12.2609876

4 April 2022 Deep MRI reconstruction with radial subsampling

George Yiasemis, Chaoping Zhang, Clara I. Sánchez, Jan-Jakob Sonke, Jonas Teuwen

Proceedings Volume 12031, Medical Imaging 2022: Physics of Medical Imaging; 1203136 (2022) https://doi.org/10.1117/12.2609876
Event: SPIE Medical Imaging, 2022, San Diego, California, United States

Conference Poster

Abstract

In spite of its extensive adaptation in almost every medical diagnostic and examinatorial application, Magnetic Resonance Imaging (MRI) is still a slow imaging modality which limits its use for dynamic imaging. In recent years, Parallel Imaging (PI) and Compressed Sensing (CS) have been utilised to accelerate the MRI acquisition. In clinical settings, subsampling the k-space measurements during scanning time using Cartesian trajectories, such as rectilinear sampling, is currently the most conventional CS approach applied which however, is prone to producing aliased reconstructions. With the advent of the involvement of Deep Learning (DL) in accelerating the MRI, reconstructing faithful images from subsampled data became increasingly promising. Retrospectively applying a subsampling mask onto the k-space data is a way of simulating the accelerated acquisition of kspace data in real clinical setting. In this paper we compare and provide a review for the effect of applying either rectilinear or radial retrospective subsampling on the quality of the reconstructions outputted by trained deep neural networks. With the same choice of hyper-parameters we train and evaluate two distinct Recurrent Inference Machines (RIMs), one for each type of subsampling. The qualitative and quantitative results of our experiments indicate that the model trained on data with radial subsampling attains higher performance and learns to estimate reconstructions with higher fidelity paving the way for other DL approaches to involve radial subsampling.

Conference Presentation

Citation Download Citation

George Yiasemis, Chaoping Zhang, Clara I. Sánchez, Jan-Jakob Sonke, and Jonas Teuwen "Deep MRI reconstruction with radial subsampling", Proc. SPIE 12031, Medical Imaging 2022: Physics of Medical Imaging, 1203136 (4 April 2022); https://doi.org/10.1117/12.2609876

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