1 Department of Radiology, Duke University, 2301 Erwin Rd, Durham, NC 27710.
2 Department of Radiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH.
AJR Am J Roentgenol. 2018 Mar;210(3):641-647. doi: 10.2214/AJR.17.18122. Epub 2018 Jan 11.
Imaging registries afford opportunities to study large, heterogeneous populations. The purpose of this study was to examine the American College of Radiology CT Dose Index Registry (DIR) for dose-related demographics and metrics of common pediatric body CT examinations.
Single-phase CT examinations of the abdomen and pelvis and chest submitted to the DIR over a 5-year period (July 2011-June 2016) were evaluated (head CT frequency was also collected). CT examinations were stratified into five age groups, and examination frequency was determined across age and sex. Standard dose indexes (volume CT dose index, dose-length product, and size-specific dose estimate) were categorized by body part and age. Contributions to the DIR were also categorized by region and practice type.
Over the study period 411,655 single-phase pediatric examinations of the abdomen and pelvis, chest, and head, constituting 5.7% of the total (adult and pediatric) examinations, were submitted to the DIR. Head CT was the most common examination across all age groups. The majority of all scan types were performed for patients in the second decade of life. Dose increased for all scan types as age increased; the dose for abdominopelvic CT was the highest in each age group. Even though the DIR was queried for single-phase examinations only, as many as 32.4% of studies contained multiple irradiation events. When these additional scans were included, the volume CT dose index for each scan type increased. Among the studies in the DIR, 99.8% came from institutions within the United States. Community practices and those that specialize in pediatrics were nearly equally represented.
The DIR provides valuable information about practice patterns and dose trends for pediatric CT and may assist in establishing diagnostic reference levels in the pediatric population.
影像学注册提供了研究大型异质人群的机会。本研究旨在检查美国放射学院 CT 剂量指数登记处（DIR）中常见儿科体部 CT 检查的剂量相关人口统计学和指标。
对 DIR 在 5 年期间（2011 年 7 月至 2016 年 6 月）提交的单次腹部和骨盆以及胸部 CT 检查进行评估（也收集了头部 CT 频率）。CT 检查分为 5 个年龄组，根据年龄和性别确定检查频率。根据身体部位和年龄对标准剂量指标（容积 CT 剂量指数、剂量长度乘积和体型特异性剂量估计）进行分类。对 DIR 的贡献也按地区和实践类型进行分类。
在研究期间，向 DIR 提交了 411655 例单次儿科腹部和骨盆、胸部和头部 CT 检查，占总（成人和儿科）检查的 5.7%。头部 CT 是所有年龄段最常见的检查。所有扫描类型中，绝大多数都是在生命的第二个十年进行的。随着年龄的增长，所有扫描类型的剂量都增加了；每个年龄组的腹部 CT 剂量最高。尽管 DIR 仅查询了单次检查，但多达 32.4%的研究包含多次照射事件。当包含这些额外的扫描时，每种扫描类型的容积 CT 剂量指数都会增加。在 DIR 中的研究中，99.8%来自美国的机构。社区实践和专门从事儿科的实践几乎同样代表。
DIR 提供了有关儿科 CT 实践模式和剂量趋势的有价值信息，并可能有助于在儿科人群中建立诊断参考水平。
