Research on the parameters for impacting the ordinate/Z-axis resolution and image noise of multi-detector spiral CT
BAI Mei, LIU Bin, ZHENG Jun-zheng(Department of Medical Engineering, Xuanwu Hospital of Capital Medical University, Beijing 100053, China)
Objective To evaluate the effect of slice thickness, collimation, pitch and reconstruction algorithm on image noise and ordinate/Z-axis resolution or slice sensitivity profile (SSP). Methods Different slice thickness, collimation, pitch and reconstruction algorithm were used to scan the phantoms. The effect of different parameters on SSP and image noise were compared. Results For SSP measurements, the FWHMs were maintained well when pitch and reconstruction algorithm were changed. For image noise measurements, the image noise decreased with increasing slice thickness and reducing collimation width (P0.05). There was no significant difference on image noise when pitch was changed (P0.05). Conclusion For multislice spiral CT, the reconstruction algorithm, pitch and collimation have no significant effect on SSP. There is no obvious relationship between image noise and pitch, but the slice thickness and collimation have obvious effect on image noise. We should take into account these parameters which impact the image quality so as to optimize CT scanning protocol.
【CateGory Index】： R814.42