By Isabelle M. Germano
A accomplished overview of the cutting-edge expertise presently on hand for neuronavigation. it is going to give you the reader with the medical purposes of this expertise to varied facets of cranial and spinal surgical procedure.
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Extra resources for Advanced Techniques in Image-Guided Brain and Spine Surgery
Bone surface points can be found using tracked Amode38 and B-mode46 ultrasound probes. The computer vision sensors, 3-D localizers, and tracked A-mode probes produce surface point sets. Tracked B-mode probes produce a set of 2-D images (or a single compounded 3-D image) from which bone surface points need to be segmented. There is a large body of literature in computer vision concerned with the surface-based registration problem. pgsI 2/28/02 10:42 AM Page 27 Sources of Error in Image Registration for Cranial Image-Guided Neurosurgery FIGURE 2–8.
To illustrate some characteristics of the expected value of TRE, Figure 2–7 shows three different configurations of four fiducial markers, along with iso-TRE contours in midcoronal, midsagittal, and transverse image slices, for a patient with a lesion in the right orbitofrontal lobe. 0 mm. f The head image in this figure is a T1-weighted gradient-echo MR image similar to those typically acquired for frameless cranial IGS. These images illustrate that TRE is smallest at the fiducial configuration centroid, that TRE increases as the distance of the target from the centroid increases, and that the iso-TRE contours are ellipsoidal.
The middle row shows that a cluster of fiducials produces small TRE values only near the cluster. The bottom row illustrates the danger of using linear or near collinear fiducial configurations. 0 mm. , in (G), contours for 1 and 2 mm are missing], which means that TRE values inside the 3 mm contour range between 2 and 3 mm. (Modified from West JB, Fitzpatrick JM, Toms SA, Maurer CR Jr, Maciunas RJ. Fiducial point placement and the accuracy of point-based, rigid-body registration. Neurosurgery 2001;48:810–817.