الفهرس 
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Abstract
This study aimed to assess the effectiveness of iterative reconstruction in reducing the radiation dose in pediatric patients performing head CT while preserving image quality. It was conducting upon 40 consecutive pediatric patients with an age ranging from one to eighteen years who were referred for non-contrast head CT examination.
Patients were divided into four different dose groups for head CT protocols by changing tube current and /or tube potential.
All studies performed on a 64-multidetector-row CT (perspective; Siemens Health Care, Erlangen, Germany) scanner, CT image volumes were reconstructed for each group using standard filtered back projection FBP technique and Sinogram Affirmed Iterative Reconstruction SAFIRE
Dose comparison between groups was done by ED, Quantitative analysis: image noise, signal to noise ratio (SNR) were calculated and visual qualitative analyses: subjective image noise, image sharpness and diagnostic acceptability scored for each study by two blinded experienced radiologist.
The effective dose (ED) was insignificantly lower in group II than of group I, the difference was 19.3%, while ED in groups III and IV were significantly lower than of group I the difference were (62.1% and 72.67%) respectively.
Subjective image quality parameters were significantly improved when iterative reconstruction (IR) was used in SDCT and LD groups while no significant change in the objectives image quality.