Tehran University of Medical Sciences Frontiers in Biomedical Technologies 2345-5837 0 0 2026 06 16 1556 1556 EN Ahad Zeinali Department of Medical Physics, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran Zubaida Bakr Al jawali Department of Medical Physics, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran Rana Awny Department of Medical Physics, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran Omar Muayad Sultan Department of Radiology, College of Medicine, Tikrit University, Tikrit, Iraq Naser Rasouli Urmia University of Medical Sciences 2025 12 16 2026 02 23 Purpose : Computed tomography (CT) is an essential diagnostic imaging modality in pediatric medicine; however, exposure to ionizing radiation poses a potential risk of radiation-induced malignancy. This multicenter study evaluated organ-specific radiation doses and estimated lifetime cancer risks in pediatric patients undergoing chest and abdominal CT imaging across multiple Iraqi healthcare centers. Material & Methods: Data from 200 pediatric patients (100 chest CT, 100 abdominal CT) were collected from three hospitals in Dohuk, Mosul, Anbar, and Baghdad, Iraq. CT acquisition parameters (kilo-voltage (kVp), pitch, slice thickness, scan length) and dose metrics (CTDIvol, DLP, effective dose) were recorded. Organ doses to lungs, thyroid, breast, and heart were estimated using imPACT software based on scanner-reported parameters. Lifetime Attributable Risk of cancer incidence was calculated using BEIR VII risk models with linear interpolation for pediatric age groups (1–5, 6–10, 11–15 years). Results: Radiation dose metrics increased significantly with age. Mean CTDIvol ranged from 8.1 ± 1.1 mGy (1–5 years) to 20.8 ± 1.2 mGy (11–15 years), with effective doses of 3.2 ± 0.3 to 6.7 ± 0.5 mSv. Organ doses demonstrated parallel trends: lung doses 4.8–8.9 mSv, thyroid doses 4.3–8.0 mSv. Cancer risk was highest in younger children (LAR: 0.16 ± 0.02 cancers/10,000 person-years/mSv), decreasing with age but remaining clinically significant. Conclusions: This study demonstrates that as children age and body size increase, CT dose and cancer risk increase; therefore, dose optimization and the use of appropriate protocols are essential. https://fbt.tums.ac.ir/index.php/fbt/article/view/1556 https://fbt.tums.ac.ir/index.php/fbt/article/download/1556/567