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Quantitative and Qualitative Comparison of Standard-Dose and Low-Dose Pediatric Head Computed Tomography: A Retrospective Study Assessing the Effect of Adaptive Statistical Iterative Reconstruction

Kilic, Koray MD; Erbas, Gonca MD; Guryildirim, Melike MD; Konus, Oznur Leman MD; Arac, Mehmet MD; Ilgit, Erhan MD; Isik, Sedat MD

Journal of Computer Assisted Tomography: May/June 2013 - Volume 37 - Issue 3 - p 377–381
doi: 10.1097/RCT.0b013e31828426de
Pediatric Radiology

Objectives Our aim was to assess the effect of adaptive statistical iterative reconstruction (ASIR) on pediatric head computed tomography (CT) examinations.

Methods We retrospectively reviewed 305 pediatric head CT examinations. The study population consisted of standard dose (STD, n = 152) examinations reconstructed with filtered back projection and low dose (LD, n = 153) examinations reconstructed with 30% (LD30) and 0% (LD0) ASIR. We compared groups by means of radiation dose, noise measures, and visual grading. Student t test, 1-way analysis of variance test, and Mann-Whitney U test were used for statistical analysis.

Results The dose in the LD30 group was significantly lower (29%) than that in the STD group (P < 0.001). The noise in the white matter (P < 0.001), SNR (P < 0.001), and subjective image noise (P = 0.044) was significantly better in the STD group than those in the LD30 group. There was no significant difference between LD30 and STD groups in the sharpness (P = 0.141), diagnostic acceptability (P = 0.079), and artifacts (P = 0.750) and contrast-to-noise ratio (P = 0.718).

Conclusions In conclusion, we found that a blend of 30% ASIR in a 16-slice multidetector CT produces diagnostically acceptable pediatric head CT examinations with a 29% less dose.

From the Department of Radiology, Gazi University School of Medicine, Ankara, Turkey.

Received for publication September 12, 2012; accepted December 19, 2012.

Reprints: Koray Kilic, MD, Department of Radiology, Gazi University School of Medicine, 06510 Besevler, Ankara, Turkey (e-mail:

This study was presented as an electronic poster (poster no. C-1001) at the European Congress of Radiology held in Vienna, Austria, 2012.

The authors have no actual or potential conflict of interest in relation to this article.

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