Int J Comput Assist Radiol Surg - Computer-assisted analysis of human upper arm flexion by 4D-visualization based on MRI.

Tópicos

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Resumo

RPOSE: 4D-visualization of the human upper arm based on sequential or dynamic MRI may be useful in functional orthopedic disorders and surgical planning. A cascade of 4D-visualization approaches have been applied including deformation of the soft tissue surfaces and muscular contraction. Skeletal structures and the epifascial tissue comprising vascular structures are included in the 4D-visualization.METHODS: Sequential MRI (T2-weighted spin echo sequences) scans of a healthy volunteer's upper extremity were obtained. The skeletal, muscular, and epifascial tissues were segmented. For 4D-rendering of the elbow joint, surface models of the humerus, the ulna, and the radius, were displaced with respect to the movement. For 4D-visualization of the soft tissue, the processed MRI data were subjected to highly transparent direct volume rendering with special two-tone transfer functions designed with regard to the application, e.g., muscular inner structure or fasciae. For rendering of time dependent behavior, the visualization was continuously updated.RESULTS: Continuous deformation of muscular inner structure and fasciae, and dynamics of muscle fibers could be differentiated in 4D-visualizations of the upper extremity. Using sequential MRI scans, this work was constrained by the high sagittal slice thickness and separation.CONCLUSION: 4D-visualization of the upper extremity based on sequential MRI is feasible and provides a realistic appearance in comparison with anatomical drawings and preparations. The 4D-visualization method may be useful for detecting and monitoring muscular pathologies and lesions.

Resumo Limpo

rpose dvisual human upper arm base sequenti dynam mri may use function orthoped disord surgic plan cascad dvisual approach appli includ deform soft tissu surfac muscular contract skelet structur epifasci tissu compris vascular structur includ dvisualizationmethod sequenti mri tweight spin echo sequenc scan healthi volunt upper extrem obtain skelet muscular epifasci tissu segment drender elbow joint surfac model humerus ulna radius displac respect movement dvisual soft tissu process mri data subject high transpar direct volum render special twoton transfer function design regard applic eg muscular inner structur fascia render time depend behavior visual continu updatedresult continu deform muscular inner structur fascia dynam muscl fiber differenti dvisual upper extrem use sequenti mri scan work constrain high sagitt slice thick separationconclus dvisual upper extrem base sequenti mri feasibl provid realist appear comparison anatom draw prepar dvisual method may use detect monitor muscular patholog lesion

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