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Evaluation of Size-Specific Dose Estimates for Optimizing Pediatric Chest CT Protocol

Zarei, F and Nasiri, M and Etemadi, Z and Haghighi, RR and Chatterjee, S and Khaneghah, PA and Chatterjee, VV (2022) Evaluation of Size-Specific Dose Estimates for Optimizing Pediatric Chest CT Protocol. In: Iranian Journal of Medical Physics, 19 (5). pp. 315-321.

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Official URL: https://doi.org/10.22038/IJMP.2021.56852.1954


Introduction: The importance of estimating patient-sized adjusted radiation dose for pediatric computed tomography (CT) has long been accepted. High doses of ionizing radiation to children are often common in chest CT examinations, as the volume CT dose index (CTDIvol) is measured by a 32 cm phantom. Our study aimed to evaluate the effectiveness of size-specific dose estimate (SSDE) to compensate for the underestimated pediatric absorbed dose. Material and Methods: CTDIvol and dose-length product (DLP) of 320 pediatric chest CT (<1, 1-5, 5-10, 10-15 years) were obtained from Picture-Archiving and Communication System (PACS) in a hospital affiliated with the Shiraz University of Medical Sciences. CTDIvol was converted to SSDE based on the patient's effective diameter. The Statistical Package for Social Science (SPSS) was used for data analysis. Results: The variations between standard phantom (32cm) and the patients' mean effective diameter were approximately 65, 57, 47, and 38, across <1, 1-5, 5-10, 10-15 year age groups, respectively. The mean of SSDE for each age group was significantly higher than the corresponding CTDIvol values. Also, mean CTDIvol and SSDE values differed between age groups significantly (p<0.001). Results showed a strong correlation between age and the two-dose indicators, CTDIvol (0.361) and SSDE (0.184), with p<0.05. Conclusion: Pediatrics receive radiation doses comparable to the dose for adult-sized patients in chest CT protocol if the dosimetry procedure is not individualized. Thus, applying a size-based conversion coefficient is paramount in estimating the absorbed dose in pediatric chest CT

Item Type: Journal Article
Publication: Iranian Journal of Medical Physics
Publisher: Mashhad University of Medical Sciences
Additional Information: The copyright for this article belongs to Mashhad University of Medical Sciences.
Keywords: Computerized tomography; Dosimetry; Ionizing radiation; Medical applications; Phantoms; Picture archiving and communication systems, Absorbed dose; Age groups; Chest; Dose estimates; Effective diameter; High dose; Pediatric computed tomographies; Phantoms; Size-specific dose estimate; X-ray computed, Pediatrics
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 12 Oct 2022 04:52
Last Modified: 12 Oct 2022 04:52
URI: https://eprints.iisc.ac.in/id/eprint/77297

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