| Paper ID | B-2-1.1 |
| Paper Title |
Deep-learning based motion-corrected image reconstruction in 4D magnetic resonance imaging of the body trunk |
| Authors |
Thomas Küstner, University Hospital Tübingen, Germany; Jiazhen Pan, University of Stuttgart, Germany; Christopher Gilliam, RMIT University, Australia; Haikun Qi, Gastao Cruz, King's College London, United Kingdom; Kerstin Hammernik, Imperial College London, United Kingdom; Bin Yang, University of Stuttgart, Germany; Thierry Blu, Chinese University of Hong Kong, Hong Kong (SAR of China); Daniel Rueckert, Imperial College London, United Kingdom; René Botnar, Claudia Prieto, King's College London, United Kingdom; Sergios Gatidis, University Hospital Tübingen, Germany |
| Session |
B-2-1: Multidimensional Biomedical Signal and Image Processing |
| Time | Wednesday, 09 December, 12:30 - 14:00 |
| Presentation Time: | Wednesday, 09 December, 12:30 - 12:45 Check your Time Zone |
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All times are in New Zealand Time (UTC +13) |
| Topic |
Biomedical Signal Processing and Systems (BioSiPS): Special Session: Multidimensional Biomedical Signal and Image Processing |
| Abstract |
Respiratory and cardiac motion can cause artifacts in magnetic resonance imaging of the body trunk if patients cannot hold their breath or triggered acquisitions are not practical. Retrospective correction strategies usually cope with motion by fast imaging sequences with integrated motion tracking under freemovement conditions. These acquisitions perform sub-Nyquist sampling and retrospectively bin the data into the respective motion states, yielding subsampled and motion-resolved k-space data. The motion-resolved k-spaces are linked to each other by non-rigid deformation fields. The accurate estimation of such motion is thus an important task in the successful correction of respiratory and cardiac motion. Usually this problem is formulated in image space via diffusion, parametric-spline or optical flow methods. Image-based registration can be however impaired by aliasing artifacts or by estimation from low-resolution images. Subsequently, any motion-corrected reconstruction can be biased by errors in the deformation fields. In this work, we propose a novel deep-learning based motion-corrected 4D (3D spatial + time) image reconstruction which combines a non-rigid registration network and a (3+1)D reconstruction network. Non-rigid motion is estimated directly in k-space based on an optical flow idea and incorporated into the reconstruction network. The proposed method is evaluated on in-vivo 4D motion-resolved magnetic resonance images of patients with suspected liver or lung metastases and healthy subjects. |