Magnetom 1.5 t mr imaging system

Treatments were delivered using the CyberKnife, an image-guided, frameless, LINAC-based, 6 MV radiosurgery system. The patient’s head was immobilized with a thermoplastic mask for imaging acquisition and treatment. The neuroimaging technique consisted of a thin-section, contrast-enhanced, multiplanar reconstruction-gradient echo volumetric study conducted on a Siemens Magnetom 1.5-T MR imaging system (Siemens, Erlangen, Germany), performed at the following parameters: repetition time (TR) 9.7 ms, echo time (TE) 4 ms, matrix 200 × 256, flip angle 1, orientation sagittal. A multislice, contrast-enhanced, head computerized tomography (CT) was also performed using a multislice scanner, Siemens Sensation 16 (Siemens, Erlangen, Germany). Contouring of the tumor and the critical volumes was performed on the co-registered MR and CT dataset. Manual contouring was done in the axial plane with simultaneous display of contours on reconstructed orthogonal images.

We used a Cyberknife system, an image-guided, frameless LINAC-based, 6 MV radiosurgery system that uses inverse planning for the delivery of radiation to a defined target volume. The patient’s head was immobilized with a thermoplastic mask for imaging acquisition and treatment. The neuroimaging technique consisted of a thin-section, contrast-enhanced, multiplanar reconstruction-gradient echo volumetric study conducted on a Siemens Magnetom 1.5-T MR imaging system (Siemens, Erlangen, Germany), performed at the following parameters: TR 9.7 ms, TE 4 ms, matrix 200 × 256, flip angle 1, orientation sagittal. A Multislice contrast-enhanced CT was also performed using a multislice scanner Siemens Sensation 16 (Siemens).
Contouring of the tumor and the critical volumes was performed on the co-registered MR and CT dataset. Manual contouring was done in the axial plane with simultaneous display of contours on reconstructed orthogonal images.