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The purpose of this study was to compare the effect of various radiographic exposure settings of multi-slices CT (MSCT) scanners on the image quality of several anatomical landmarks used for per-surgical assessment of dental implants. A dry adult skull embedded in plexi material was used in the image acquisitions using both a GE 16 slices CT scanner (Milwaukee, USA) and a T oshiba Aquilion CT scanner (Toshiba Corporation, Japan). The exposure settings were manually adjusted for a full clear image of the head. The image qualities were assessed blindly by three dental implant specialists in randomised order. The image quality score was based on a 5 points scale where 1 is considered as not clearly visible and 5 positively clearly visible and the overall image quality (OIQ) based on 3 point ranking system scale (poor, acceptable and clear). Toshiba MSCT with 200 and 250 mA produced consistent good image quality in all three tube voltages (80,100,120 kVp) whilst 100mA setting provided the lowest image quality. In comparison, the GE MSCT with a 120 mA has shown acceptable image quality with various tube voltages while good image quality was present consistently with high kVp (120) and mA (120, 180 and 240) settings.

Computed Tomography Image Quality Evaluation for pre-surgical dental implant site assessment using Different Exposure Setting Protocols: Mandibular Phantom Study