Imaging And Targeting

Scanning, most often with CT, is done. An adapter to the scan table, needed for radiosurgery image acquisition, is not necessary but may make scan interpretation and targeting easier. Axial scans with 3-mm slice thickness are obtained; if a lesion is known to enhance with contrast, this is given as well. Imaging for localization for functional surgery (e.g., targeting the Vim nucleus of the thalamus) should use the thinnest possible slices, usually 1 mm [5]. The scan field of view should be 34.5 to ensure inclusion of the localizer rods in the image. Gantry tilt should be avoided if a surgical navigation (SN) computer or the Radionics Stereo Calc program is to be used for image processing; if the dedicated Radionics "mini-computer" (MC) is used, then the gantry may be angled to optimize target visualization. This will be of use mainly for identifying the AC-PC line for functional targeting.

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