Accuracy and reproducibility of coordinates, angles/areas and volume measurements are the main goal of image-guided stereotactic systems. Errors in measurements are due to pitfalls in a present systems. Factors responsible for inaccuracy and
variability
on measurements are inappropriate display window settings, unequal spatial resolution, display/film distortion, inappropriate slice width, lack of isocentricity between gantry and frame. And nonparallelism between frame and scanning plan.
The most important factor that causes errors when using stereotactic frames is the nonparallel relationship to the plane of scanning. For the solution of above problem, author developed a computer program for the measurement of the coordinates of
intracerebral target, which is operated by the personal computer. This program can decrease the range of errors in measurements and also calculate the actual spatial coordinates regardless of the inappropriate parallelism between frame and
scanning
plane.
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