Brilliance ct 64 system

We searched the database of the department of radiology of a hospital institution from January 2010 to April 2013 for patients who underwent CT scans of the skull base. Individuals with a previous history of paranasal sinus disease or endonasal surgery were excluded. A total of 421 patients were selected. Informed consent was obtained from all individual participants included in the study.
All patients underwent a CT scan with skull base sections using the Brilliance CT 64 system (Philips, 2004). The scan was performed with 20 × 0.625 collimation, a pitch of 0.348, a matrix of 512; 200 mm of field of view. Section thickness ranged from 0.6 to 1 mm. The obtained data were transferred to the Extended Brilliance Workspace (Philips Medical System), where the images were reconstructed in the axial, coronal, and sagittal planes.

The magnetic resonance (MR) images of the skull were obtained in a MAGNETON Sonata 1.5 T device (Siemens Healthcare, Erlangen, Germany), with an eight-channel head coil and having the following technical specifications: gradient of 40 mT/m, matrix of 256 × 256 pixels, field of view (FOV) of 256 × 256 mm and slice thickness of 1 mm. The T1 sequence with gadolinium was acquired in the sagittal plane with TR of 2000 ms and TE of 3.42 ms. The skull CT images were obtained with the Brilliance CT 64 System (Philips, 2004) with collimation of 20 × 0.625, 0.348 pitch, 512 × 512 matrix, 200 mm field of view, 140 kpV, 278 to 600 mA and 1 mm thick. The image files in the DICOM format were imported into the Horos 1.1.7 software (GNU General Public License, version 3). The “point tool” provides the three-dimensional coordinates (x, y, z) of each of the marked points.
Point A: Point of interest marked in the software.
Points R1 and R2: These points must correspond to two surface anatomical references easily identified in the patient (Example: nasion and external acoustic pore).