gms | German Medical Science

67th Annual Meeting of the German Society of Neurosurgery (DGNC)
Joint Meeting with the Korean Neurosurgical Society (KNS)

German Society of Neurosurgery (DGNC)

12 - 15 June 2016, Frankfurt am Main

Experimental evaluation of accuracy of 3D-reconstructed navigated ultrasound compared to intraoperative MRI

Meeting Abstract

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  • Max Siekmann - Neurochirurgie der Universität Ulm, Standort Günzburg, Germany
  • Christian Rainer Wirtz - Neurochirurgie der Universität Ulm, Standort Günzburg, Germany
  • Jan Coburger - Neurochirurgie der Universität Ulm, Standort Günzburg, Germany

Deutsche Gesellschaft für Neurochirurgie. 67. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), 1. Joint Meeting mit der Koreanischen Gesellschaft für Neurochirurgie (KNS). Frankfurt am Main, 12.-15.06.2016. Düsseldorf: German Medical Science GMS Publishing House; 2016. DocMI.07.03

doi: 10.3205/16dgnc276, urn:nbn:de:0183-16dgnc2761

Published: June 8, 2016

© 2016 Siekmann et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License. See license information at http://creativecommons.org/licenses/by/4.0/.


Outline

Text

Objective: Currently, intraoperative MRI(iMRI) is the “gold standard” of intraoperative imaging in glioma surgery. In addition, intraoperative navigated 3D-reconstructed ultrasound (iUS) is another fast viable, inexpensive and easily available possibility of intraoperative imaging with potentially similar results. Aim of the study was to evaluate accuracy of a linear (liUS) and a sector array ultrasound (siUS) probe and their 3D-reconstruction in comparison to iMRI based on measurements of a gel phantom.

Method: We developed an agarose gel phantom containing 3D-objects, visible in iMRI and US. All of the objects had the same measures and were arranged in a defined angle towards each other to detect 2-point-discrimination. We performed 56 navigated ultrasound sweeps in a predefined depth in perpendicular (per) and parallel (par) direction referred to the orientation of the objects and iMRI imaging of the phantom. Differences of reconstructed 3D-objects among the three imaging methods were evaluated in the navigation software and also compared to 2D-US resolution.

Results: Imaging error in 3D reconstruction of iUS shows a correlation between sweep direction and results in siUS and liUS. 2D-images have a significantly (p < 0.01) worse resolution than 3D-reconstructed images with its image plane perpendicular to the fissure, whereas there is no significant deviation from results with 3D-reconstructed parallel US images. Reconstructed image sets of siUS showed significantly worse resolution (siUS per: 0,6mm; siUS par: 1.2mm; siUS 2D: 1.1mm) than iMRI and liUS in all sweep directions. While liUS has a significantly (p < 0.01), better resolution than iMRI in reconstructed objects with an image plane perpendicular to sweep (iMRI: 0.2mm; liUS per: 0.1mm). In parallel sweep direction, iMRI is significantly (all p < 0.01) better for length, width and volume, but there is no significant difference in resolution (liUS par: 0.3mm, iMRI 0.2mm).

Conclusions: In an experimental setting, image quality and resolution of liUS shows similar results as iMRI for 3D-reconstructed images, depending on sweep directions, while simple 2D-images have a significant lower resolution than iMRI and 3D-reconstructed liUS. siUS transducers have a significant lower resolution than both, iMRI and liUS in 2D and 3D reconstruction. Therefore, 3D liUS might be an easily available alternative to modern iMRI imaging in intracranial neurosurgery.