By Isabelle M. Germano
A complete evaluate of the cutting-edge expertise at present on hand for neuronavigation. it is going to give you the reader with the medical functions of this expertise to numerous features of cranial and spinal surgical procedure.
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Additional info for Advanced techniques in image-guided brain and spine surgery
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. Because TRE depends on the shape of the fiducial configuration, the configuration can affect the accuracy of navigation in IGS systems using fiducials to perform point-based IPR.
These artifacts do not affect the geometrical fidelity of the image, but they can interfere with fiducial marker localization or surgical target identification. The spatial fidelity of CT image slices is determined largely by the number, position, and operating characteristics of detecting sensors, and is, therefore, relatively constant between studies and independent of the specific patient imaged. , Wang et al4). , its shape and size). But it is generally not possible to manually identify a surgical target with accuracy better than the voxel dimension.
By tracking the position of an A-mode ultrasound transducer, it is possible to calculate the position of a bone surface point as the position of the ultrasound transducer face plus the distance to the bone– tissue interface along the ultrasound beam axis. 46 Intensity-based registration Intensity-based registration involves computing a transformation between two images using image voxel values rather than geometrical features such as points or surfaces derived from the images. The term intensity refers to the scalar value of an image voxel.
Advanced techniques in image-guided brain and spine surgery by Isabelle M. Germano