Int J Comput Assist Radiol Surg - Target visibility enhancement for C-arm cone beam CT-fluoroscopy-guided hepatic needle placement: implementation and accuracy evaluation.

Tópicos

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Resumo

RPOSE: Fluoroscopy-guided hepatic intervention is limited by target visibility and respiratory movement. A feasible procedure for visibility enhancement of the key regions and targets in 2D fluoroscopic images is needed. A system was developed to improve targeting by integrating the forward projection of objects extracted from 3D cone beam CT (CBCT) volumes. The target matching accuracy during regular respiration was measured to evaluate the system.METHOD: 3D CBCT abdominal volumes were acquired and segmented to extract different regions, including the diaphragm, hepatic vessels, bony structures, and hepatic tumor. The segmented result was rendered and projected to generate augmented fluoroscopy fusion images. The target matching accuracy by applying these procedures was evaluated for the hepatic intervention guidance.RESULT: Quantitative assessment of the target matching accuracy in the upper section of liver was performed for eight targets from four subjects. The 2D and 3D target matching accuracy were 0.98?0.37 and 1.47?0.26 mm, respectively. The 2D target matching accuracy was 1.46?0.67 mm for the target in the lower liver. This accuracy should be acceptable for the 5 mm safety margin required in clinical use.CONCLUSION: Visibility of targets in 2D fluoroscopy was enhanced to improve interactive navigation guidance for hepatic needle placement. The target matching accuracy for the C-arm cone beam CT-fluoroscopy-guided hepatic needle targeting was sufficient for clinical use.

Resumo Limpo

rpose fluoroscopyguid hepat intervent limit target visibl respiratori movement feasibl procedur visibl enhanc key region target d fluoroscop imag need system develop improv target integr forward project object extract d cone beam ct cbct volum target match accuraci regular respir measur evalu systemmethod d cbct abdomin volum acquir segment extract differ region includ diaphragm hepat vessel boni structur hepat tumor segment result render project generat augment fluoroscopi fusion imag target match accuraci appli procedur evalu hepat intervent guidanceresult quantit assess target match accuraci upper section liver perform eight target four subject d d target match accuraci mm respect d target match accuraci mm target lower liver accuraci accept mm safeti margin requir clinic useconclus visibl target d fluoroscopi enhanc improv interact navig guidanc hepat needl placement target match accuraci carm cone beam ctfluoroscopyguid hepat needl target suffici clinic use

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