This investigation is aimed to study the feasibility of size-specific dose estimate (SSDE) to patient dosimetry in pediatric head CT scans and to establish typical values in a hospital in Tunja, Colombia. The volumetric computed tomography index (CTDIvol) and the dose-length product of 468 pediatric patients from newborn to 15-year-olds, who underwent non-contrast head CT scans, were collected retrospectively. For 186 cases only, SSDE was estimated using patient attenuated-based size metrics and CTDIvol,16-to-SSDE conversion factors reported in AAPM report 293. Results showed that SSDE is an accurate metric that can be used to establish typical dose values from pediatric head CT scans. Median SSDE values of 33.5, 31.6, 36.2 and 57.9 mGy were established as typical dose values for the 0–<3 months, 3 months–<1 y, 1–<6 y and ≥6 y, respectively, to further assist the optimization process at the hospital. Further studies with more robust data of patients and hospitals should be conducted to establish local and national dose reference levels from pediatric CT scans in Colombia.

中文翻译：

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小儿非对比性头部 CT 扫描的特定尺寸剂量估计：哥伦比亚 TUNJA 的一项回顾性患者研究

本调查旨在研究在儿科头部 CT 扫描中对患者剂量测定进行尺寸特异性剂量估计 (SSDE) 的可行性，并在哥伦比亚通哈的一家医院建立典型值。回顾性收集了 468 名接受非对比头部 CT 扫描的新生儿至 15 岁儿童患者的体积计算机断层扫描指数（CTDIvol）和剂量长度乘积。仅对 186 例病例，SSDE 是使用基于患者减毒的尺寸指标和 CTDIvol、16 到 SSDE 转换因子在 AAPM 报告 293 中估计的。结果表明，SSDE 是一种准确的指标，可用于确定儿科的典型剂量值头部CT扫描。SSDE 中值 33.5、31.6、36.2 和 57.9 mGy 被确定为 0-<3 个月、3 个月-<1 年、1-<6 年和≥6 年的典型剂量值，分别进一步协助医院的优化过程。应开展对患者和医院更可靠数据的进一步研究，以确定哥伦比亚儿科 CT 扫描的地方和国家剂量参考水平。