Int J Comput Assist Radiol Surg - New prototype neuronavigation system based on preoperative imaging and intraoperative freehand ultrasound: system description and validation.

Tópicos

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Resumo

RPOSE: The aim of this report is to present IBIS (Interactive Brain Imaging System) NeuroNav, a new prototype neuronavigation system that has been developed in our research laboratory over the past decade that uses tracked intraoperative ultrasound to address surgical navigation issues related to brain shift. The unique feature of the system is its ability, when needed, to improve the initial patient-to-preoperative image alignment based on the intraoperative ultrasound data. Parts of IBIS Neuronav source code are now publicly available on-line.METHODS: Four aspects of the system are characterized in this paper: the ultrasound probe calibration, the temporal calibration, the patient-to-image registration and the MRI-ultrasound registration. In order to characterize its real clinical precision and accuracy, the system was tested in a series of adult brain tumor cases.RESULTS: Three metrics were computed to evaluate the precision and accuracy of the ultrasound calibration. 1) Reproducibility: 1.77?mm and 1.65?mm for the bottom corners of the ultrasound image, 2) point reconstruction precision 0.62-0.90?mm: and 3) point reconstruction accuracy: 0.49-0.74?mm. The temporal calibration error was estimated to be 0.82?ms. The mean fiducial registration error (FRE) of the homologous-point-based patient-to-MRI registration for our clinical data is 4.9 ? 1.1?mm. After the skin landmark-based registration, the mean misalignment between the ultrasound and MR images in the tumor region is 6.1 ? 3.4?mm.CONCLUSIONS: The components and functionality of a new prototype system are described and its precision and accuracy evaluated. It was found to have an accuracy similar to other comparable systems in the literature.

Resumo Limpo

rpose aim report present ibi interact brain imag system neuronav new prototyp neuronavig system develop research laboratori past decad use track intraop ultrasound address surgic navig issu relat brain shift uniqu featur system abil need improv initi patienttopreop imag align base intraop ultrasound data part ibi neuronav sourc code now public avail onlinemethod four aspect system character paper ultrasound probe calibr tempor calibr patienttoimag registr mriultrasound registr order character real clinic precis accuraci system test seri adult brain tumor casesresult three metric comput evalu precis accuraci ultrasound calibr reproduc mm mm bottom corner ultrasound imag point reconstruct precis mm point reconstruct accuraci mm tempor calibr error estim ms mean fiduci registr error fre homologouspointbas patienttomri registr clinic data mm skin landmarkbas registr mean misalign ultrasound mr imag tumor region mmconclus compon function new prototyp system describ precis accuraci evalu found accuraci similar compar system literatur

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