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A modular motion compensation pipeline for prospective respiratory motion correction of multi-nuclear MR spectroscopy. | LitMetric

AI Article Synopsis

  • Respiratory motion significantly impacts the quality of magnetic resonance imaging (MRI) of the torso, necessitating rapid MR imaging techniques to effectively track and correct this motion.
  • A new pipeline has been developed that uses MR image navigators and OpenCV for tracking organ motion, enabling accurate motion correction during MRI acquisitions, tested on both 3 T and 7 T scanners.
  • The proposed method demonstrated high tracking precision with kernelized correlation filter (KCF) achieving close accuracy to manual assessments, making it a promising tool for imaging dynamic organs like the heart and kidneys.

Article Abstract

Magnetic resonance (MR) acquisitions of the torso are frequently affected by respiratory motion with detrimental effects on signal quality. The motion of organs inside the body is typically decoupled from surface motion and is best captured using rapid MR imaging (MRI). We propose a pipeline for prospective motion correction of the target organ using MR image navigators providing absolute motion estimates in millimeters. Our method is designed to feature multi-nuclear interleaving for non-proton MR acquisitions and to tolerate local transmit coils with inhomogeneous field and sensitivity distributions. OpenCV object tracking was introduced for rapid estimation of in-plane displacements in 2D MR images. A full three-dimensional translation vector was derived by combining displacements from slices of multiple and arbitrary orientations. The pipeline was implemented on 3 T and 7 T MR scanners and tested in phantoms and volunteers. Fast motion handling was achieved with low-resolution 2D MR image navigators and direct implementation of OpenCV into the MR scanner's reconstruction pipeline. Motion-phantom measurements demonstrate high tracking precision and accuracy with minor processing latency. The feasibility of the pipeline for reliable in-vivo motion extraction was shown on heart and kidney data. Organ motion was manually assessed by independent operators to quantify tracking performance. Object tracking performed convincingly on 7774 navigator images from phantom scans and different organs in volunteers. In particular the kernelized correlation filter (KCF) achieved similar accuracy (74%) as scored from inter-operator comparison (82%) while processing at a rate of over 100 frames per second. We conclude that fast 2D MR navigator images and computer vision object tracking can be used for accurate and rapid prospective motion correction. This and the modular structure of the pipeline allows for the proposed method to be used in imaging of moving organs and in challenging applications like cardiac magnetic resonance spectroscopy (MRS) or magnetic resonance imaging (MRI) guided radiotherapy.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11088657PMC
http://dx.doi.org/10.1038/s41598-024-61403-wDOI Listing

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