Ict 256 slice ct scanner

CT examinations were conducted with an iCT 256-slice CT scanner (Philips) set to 120 kVp and 60 mA with 512 × 512-pixel image resolution, 0.78-mm pixel size, 0.45-mm slice increment, and 0.9-mm slice thickness. Images were then exported to Mimics (version 18; Materialise) in DICOM (Digital Imaging and Communications in Medicine) format for further processing. For segmentation, the threshold was set to 1,250 to 2,600 Hounsfield units (HU). The resulting models were sliced at the base of the femoral neck and 5 cm below the lesser trochanter, leaving only the trochanteric region of the proximal part of the femur. A mirrored model of the femoral neck fracture was exported together with the model of the uninjured proximal part of the femur to 3-matic (version 18; Materialise). The models of the femoral neck fracture and the uninjured femur were then superimposed by means of point set registration. To achieve the best possible alignment, the computer software used an iterative closest point (ICP) algorithm to minimize the distance between corresponding points. This process requires manual input of at least 3 corresponding regions on the 2 models, and, to improve the precision of the ICP alignment, we used 7 anatomical landmarks as previously described^{8 (link)}.

CT head examinations for the non-MBIR group were acquired on a Toshiba aquilion^TM, 64-slice CT scanner, while for the MBIR group the images were acquired on a Philips Brilliance iCT 256-slice CT scanner using MBIR technology. The protocols for both the groups are summarized in Table 1. The images from both the study groups were transferred to a common workstation for analysis.