Cheong-Hwan  Lim, Yoon-Jeong  Kim, Dan-Bi  Lee, Ino  Yu, Su-Chul  Han, Hong-Ryang  Jung, 
    Imaging Radiation Dose Reduction with Adaptive Statistical Iterative
Reconstruction in Brain CT,
    Journal of Engineering and Applied Sciences,
    Volume 12,Issue 24,
    2017,
    Pages 7431-7434,
    ISSN 1816-949x,
    jeasci.2017.7431.7434,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2017.7431.7434)
    Abstract: We compared and analyzed patient doses depending on the application of FBP (Filtered Back
Projection) and ASIR (Adaptive Statistical Iterative Reconstruction Algorithm). A64-MDCT Optima ™ CT 660
system was used for imaging. For quantitative analysis, images containing both sides of orbit and basal ganglia
were obtained. After setting a 40~45 mm<sup>2</sup> area as Region of Interest (ROI), the average CT number was
measured. A Statistical Program, SPSS 22.0 was used for the calculations and ANOVA, Kruskal-Wallis and
paired t-tests were performed after the normality and equivalence tests. For quantitative analysis, a comparison
of SNR of each scan type was carried out. From the Kruskal-Wallis test, the SNR of axial scan was 0.13&plusmn;0.67
and the SNR of Helical scan was 0.12&plusmn;0.64. There was a significant difference for the axial scan values
(&#967;<sup>2</sup>= 12.54, p<0.05) but there was no corresponding significant difference for those from the Helical scan
(&#967;<sup>2</sup> = 0.49, p>0.05). When ASIR was applied in the axial scan, the value of CTDI<sub>vol
</sub> decreased by 21.46 mGy
(47.8%) at maximum. The value of DLP decreased by 343.42 mGy&#8226;cm (47.8%) at maximum. When ASIR was
applied in the Helical scan, the value of CTDI<sub>vol
</sub> decreased by 18.52 mGy (49.9%) at maximum and the value of vol
DLP decreased by 328.92 mGy&#8226;cm (49.9%) at maximum. This study could confirm a dose reduction through
applying FBP and ASIR algorithm for each scan type in brain CT imaging.
    Keywords: dose reduction;ASIR (Adaptive Statistical Iterative Reconstruction Algorithm);FBP (Filtered Back Projection);patient;quantitative;equivalence