9 research outputs found
Dynamic-MRI quantification of abdominal wall motion and deformation during breathing and muscular contraction
International audienc
Semiautomatic quantification of abdominal wall muscles deformations based on dynamic MRI image registration
International audiencein the diagnosis of abdominal muscle deficiency. Here, wepresent a dedicated semiautomatic dynamic MRI postprocessing method enablingthe quantification of spatial and temporal deformations of the antero-lateral abdominalwall muscles. Ten healthy participants were imaged during a controlled breathingsession at the L3–L4 disc level using real-time dynamic MRI at 3 T. A coarse featuretrackingstep allowed the selection of the inhalation cycle of maximum abdominalexcursion. Over this image series, the described method combines (1) a supervised2D+t segmentation procedure of the abdominal wall muscles, (2) the quantificationof muscle deformations based on masks registration, and (3) the mapping of deformationswithin muscle subzones leveraging a dedicated automatic parcellation. Thesupervised 2D+t segmentation (1) provided an accurate segmentation of the abdominalwall muscles throughout maximum inhalation with a 0.95 ± 0.03 Dice similaritycoefficient (DSC) value and a 2.3 ± 0.7 mm Hausdorff distance value while requiringonly manual segmentation of 20% of the data. The robustness of the deformationquantification (2) was indicated by high indices of correspondence between the registeredsource mask and the target mask (0.98 ± 0.01 DSC value and 2.1 ± 1.5 mmHausdorff distance value). Parcellation (3) enabled the distinction of muscle substructuresthat are anatomically relevant but could not be distinguished based on imagecontrast. The present genuine postprocessing method provides a quantitative analyticalframe that could be used in further studies for a better understanding of abdominalwall deformations in physiological and pathological situations
Tensile mechanical properties of the cervical, thoracic and lumbar porcine spinal meninges
International audienc
Preoperative Prediction of Small Bowel Length Using CT Scan and Tridimensional Reconstructions: a New Tool in Bariatric Surgery?
International audienc