High Pitch Imaging has been used mainly for cardiac imaging because of its high temporal resolution. As some angles of scanned object are not covered during scanning it could decrease the radiation dose of examination. In this study we aimed to evaluate the effect of high pitch imaging on patient radiation doses and image quality in paranasal CT examinations.

Followingapproval from local ethical committee, thirteen (n=13) cadaver heads werescanned with a first generation 64 detector dual tube CT scanner (Definition, Siemens Medical Systems; Erlangen, Germany). Scan range was determined to be from the upper border of frontal sinuses to the inferior border of maxillary alveolar process. Each head was scanned 10 times with following parameters (Table 1) (Figure 1) Scan No kV Tube Current (mAs) pitch 1 120 80 1.2 2 120 80 3 3 120 50 3 4 120 20 3 5 120...

Limitations: Some of the effective dose results of this study are inconsistent with high pitch literature. Those results must be confirmed with future studies and using of high pitch imaging with first generation dual tube scanners in paranasal sinus examinations should be made with caution. As first generation dual tube scanners don't have additional filters and predetector collimators, effective radiation dose could be more than expected in small scan lenghts as used in this study. Radiation doses used in the study are acquired from CTDIvol...

Hacettepe University hospital has 1000 beds, 30 operating rooms, 2 dual slice CT, one 16 detector CT, one 4 detector CT, one dual tube CT scanners, four1.5T andone 3T MR scanners. Prof. Dr.Kader Karli Oguz is the chief of Neuroradiology Section of Hacettepe University. Prof. Dr.Burce Ozgen Mocan is chief of the Head and Neck Imaging Section. Onur Akca and Elif Bulut are staff members of the neuroradiology and head and neck imaging sections. Prof. Md. Erhan Akpınar is chief of Emergency Radiology of Hacettepe...

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