Journal
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
Volume 102, Issue -, Pages 79-87Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ejmp.2022.09.005
Keywords
MRI; Motion calibration; Motion artifact; Motion estimation; In -vivo; EPI; Spin -Echo
Funding
- Lausanne University Hospital (CHUV) , Switzerland
- University of Lausanne (UNIL) , Switzerland
- Ecole polytechnique federale de Lausanne (EPFL), Switzerland
- University of Geneva (UNIGE), Switzerland
- Geneva University Hospitals (HUG), Switzerland
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MRI is a non-invasive medical imaging modality that is sensitive to patient motion. This study presents a methodology for acquiring reproducible motion-corrupted MRI images and validating the system's performance through motion estimation using rigid-body volume registration. The proposed protocol is versatile and can potentially benefit the MRI and artificial intelligence research communities.
MRI is a non-invasive medical imaging modality that is sensitive to patient motion, which constitutes a major limitation in most clinical applications. Solutions may arise from the reduction of acquisition times or from motion-correction techniques, either prospective or retrospective. Benchmarking the latter methods requires labeled motion-corrupted datasets, which are uncommon. Up to our best knowledge, no protocol for generating labeled datasets of MRI images corrupted by controlled motion has yet been proposed. Hence, we present a methodology allowing the acquisition of reproducible motion-corrupted MRI images as well as validation of the system's performance by motion estimation through rigid-body volume registration of fast 3D echo-planar imaging (EPI) time series. A proof-of-concept is presented, to show how the protocol can be implemented to provide qualitative and quantitative results. An MRI-compatible video system displays a moving target that volunteers equipped with customized plastic glasses must follow to perform predefined head choreographies. Motion estimation using rigid-body EPI time series registration demonstrated that head position can be accurately determined (with an average standard deviation of about 0.39 degrees). A spatiotemporal upsampling and interpolation method to cope with fast motion is also proposed in order to improve motion estimation. The proposed protocol is versatile and straightforward. It is compatible with all MRI systems and may provide insights on the origins of specific motion artifacts. The MRI and artificial intelligence research communities could benefit from this work to build in-vivo labeled datasets of motion-corrupted MRI images suitable for training/testing any retrospective motion correction or machine learning algorithm.
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