Int J Comput Assist Radiol Surg - Patient-specific ultrasound liver phantom: materials and fabrication method.

Tópicos

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Resumo

RPOSE: An anatomically realistic ultrasound liver phantom with tissue-specific distinct signal properties is needed for training of novices in diagnostic and interventional procedures. The main objective of this work was development and testing of a new durable liver ultrasound training phantom for use with a hybrid simulator.METHODS: A liver ultrasound phantom was fabricated in four main phases: materials selection, segmentation of CT images and realization of 3D models, vessel and lesion realization, and final assembly with silicone casting. Silicone was used as basic material due to its durability and stability over time. Several additives were analyzed and mixed with the polymer to reproduce the echogenicity of three simulated soft tissue types: parenchyma, lesions, and veins.RESULTS: Cysts and vessel trees appear anechoic in the B mode ultrasound images when realized with pure silicone. The liver parenchyma, hypoechoic, and hyperechoic lesions were realized with different concentrations of graphite and Vaseline oil to increase their relative echogenicity. These materials were successful for creation of an ultrasound liver phantom containing simulated blood vessels and lesions.CONCLUSION: The phantom reproduces the human liver morphology and provides vessels and lesions ultrasound images with recognizable differences in echogenicity. The speed of sound in the simulated materials is inaccurate, but the problem can be overcome via software adjustment in a hybrid simulator.

Resumo Limpo

rpose anatom realist ultrasound liver phantom tissuespecif distinct signal properti need train novic diagnost intervent procedur main object work develop test new durabl liver ultrasound train phantom use hybrid simulatormethod liver ultrasound phantom fabric four main phase materi select segment ct imag realiz d model vessel lesion realiz final assembl silicon cast silicon use basic materi due durabl stabil time sever addit analyz mix polym reproduc echogen three simul soft tissu type parenchyma lesion veinsresult cyst vessel tree appear anecho b mode ultrasound imag realiz pure silicon liver parenchyma hypoecho hyperecho lesion realiz differ concentr graphit vaselin oil increas relat echogen materi success creation ultrasound liver phantom contain simul blood vessel lesionsconclus phantom reproduc human liver morpholog provid vessel lesion ultrasound imag recogniz differ echogen speed sound simul materi inaccur problem can overcom via softwar adjust hybrid simul

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