Schlaier, Juergen and Herzog, Peter and Schoedel, Petra and Aldebert, Hans and Lange, Max and Doenitz, Christian and Winkler, Juergen and Warnat, Jan and Finkenzeller, Thomas and Brawanski, Alexander (2006) Relevance of correction for rotational targeting error in functional neurosurgery. Computer aided surgery : official journal of the International Society for Computer Aided Surgery 11 (1), pp. 37-42.
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Other URL: http://dx.doi.org/10.1080/10929080500432132
OBJECTIVE: A prospective study is presented on the amount of targeting error that is due to rotational deviations between the atlas and the stereotactic coordinate system. MATERIALS AND METHODS: We investigated 14 volunteers with a stereotactic frame fixed to their heads by tight adhesive bands. Sagittal, coronal and axial T2-weighted MRI scans, as well as MPRage sequences, were performed. The anterior and posterior commissures and one additional point on the midline (the septum pellucidum) were determined on the axial T2-weighted images. Bilateral atlas coordinates for the subthalamic nucleus (STN), globus pallidus pars interna (GPi) and nucleus ventralis intermedius (Vim) were transformed to stereotactic frame coordinates, either without correction or by 2-point or 3-point correction. A total of 896 coordinates (x, y, z for the STN, GPi and Vim in both hemispheres) were calculated. RESULTS: Although the mean differences between the two algorithms (0.24 +/- standard deviation of 0.33 mm) were within the range of system-immanent inaccuracies in MRI-guided stereotaxy, deviations of up to 2.8 mm occurred. No significant correlation was found regarding the amount of rotational angle and the differences in x-, y-, or z-coordinates when 2-point and 3-point transformations were compared. CONCLUSIONS: The reliability of meticulous trajectory planning might be compromised significantly by using only 2-point-based correction or no calculations at all.
|Institutions:|| Medicine > Lehrstuhl für Röntgendiagnostik|
Medicine > Lehrstuhl für Neurochirurgie
|Keywords:||Stereotaxy; targeting error; functional neurosurgery; deep brain stimulation|
|Subjects:||600 Technology > 610 Medical sciences Medicine|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||01 Mar 2007|
|Last Modified:||05 Aug 2009 13:25|