Abstract: Stereotactic radiosurgery is the precise delivery of high dose radiation to cranial lesions. A combination of isocenters or `shots' is utilized by the physician to map the contours of the target lesion. The accurate localization and definition of the lesion is a crucial element of this procedure. A system has been developed that allows the physician to define 3-D wire frame objects from a series of displayed images. Each image of the series is displayed as the background of a graphics screen. In order to facilitate more accurate definition of the lesion, variable contrast mapping and stretching routines allow the physician to adjust the histogram of the image for maximum visualization of the lesion and neighboring structures. A segmentation routine automatically detects the location of reference coordinates provided by a stereotactic frame fixed to the patient's skull. The physician is then able to create precise, 3-D wire frame representations of cranial lesions and structures, quickly and easily, buy selecting points on the displayed images. These wire frame representations can then be used to display the lesion stereoscopically in 3-D as opposed to 2-D cross-sections. !2
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