intracranial stereotactic radiosurgery with the ExacTrac X-ray system (ETX) and a frameless
mask. Methods A total of 143 patients who completed a pre-treatment examination for IFM
were eligible for this study. The frameless mask type B R408 (Klarity Medical & Equipment
Co., Ltd., Guangzhou, China), which covers the back of the head, and the entire face, was
used for patient immobilization. After the initial 6D correction and first X-ray verification (IFM …