A phantom study of the immobilization and the indications for using virtual isocenter in stereoscopic X-ray image guidance system referring to position localizer in frameless radiosurgery.

Only when the distance of the ITT isocenter and the skull edge was greater than 80 mm on the z‐axis (cranial–caudal) after mask resetting became statistically insignificant, but the deviations still showed a trend, with a p‐value less than 0.1.

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