FIG 2. CT scans chosen for rWTH measures. Represented are eight contiguous 2-mm-thick sections spanning the whole caudal-to-rostral extension of the temporal horns of a patient with AD. The scans in which the right and left horns can be appreciated in their full length are C and D, and these are chosen for the measurements. Parallel lines are drawn tangentially to the tip of the temporal horns where the width is maximum (arrows).