Outcome measures
BEST

A multiplanar spiral CT machine (Philips brilliance 64, Philips Medical Systems, Best, the Netherlands) was used to obtain pre- (T1) and post-treatment (T2) CT images. The CT scans were performed at 80 kV and 100 mAs, one pitch, 2.5 mGy (CTDIvol), and a 1.25 mm slice thickness.

Each image was resliced to make the head orientation uniform along the midsagittal and Frankfort horizontal planes. The basion, crista galli, and glabella landmarks defined the midsagittal plane. The Frankfort horizontal plane was defined by the right and left orbitale landmarks and the right porion landmark.
The image processing procedures are shown in
