Abstract:
In this work, a computer interface is developed to deform atlas overlays, so as to make them fit to a certain case, namely a particular patient's anatomy for pre-operational target determination for neurosurgeries. The integration of CT images with atlas overlays is first achievement. Secondly, the ACTR (Atlas-CT registrar) is equipped with many abilities to manipulate the overlays and CT images in all axial, sagittal and frontal views, namely, to zoom them, to span in the zoomed one, to scroll through atlas overlays and CT images, and to place the overlays on their propel locations on sagittal CT image. One of the most powerful features of ACTR is its independence to zooming factor during placing process of overlays onto sagittal CT image, which is done respect to coordinates of Anterior and posterior commissure. It is also independent of zooming factor during the selection of analog points from a zoomed CT image and an atlas overlay. Deformation is done by analog points with no necessity of the measurement of the dimensions of the region of the patient like in interest on CT console or film or of modeling of the cortical surface of earlier versions of such tools, and the utilization of a 2-D coordinates of analog points. deformation fed by the coordinates of analog points. In terms of time, the system is able to calculate the coordinates of region of interest within a quarter of an hour with a great range of selection for region of interest.|Keywords : Computerised Tomography , Atlas Overlays, Image Deformation, 2-D deformations.
