Abstract：
Background: To assess the impact of different clinical questions on radiation doses acquired during cardiac computed tomography in children. Methods: A total of 116 children who underwent cardiac CT on a third-generation dual-source CT scanner were included. The clinical questions were divided into three main categories: the extent of scanning in the z-axis, coronary artery assessment and cardiac function assessment. Radiation dose values represented as a dose-length product (DLP) in mGy*cm were recorded from the CT scanner protocols. Results: There were significantly higher doses in cases with cardiac function assessment (median DLP 348 versus 59 mGy*cm, p < 0.01) and in cases with coronary artery assessment (median DLP 133 versus 71 mGy*cm, p < 0.01). Conclusion: The most important factor was the assessment of cardiac function, where the median radiation dose was 4.3× higher in patients with a request for cardiac function assessment. We strongly recommend that clinical requests for cardiac CT should be carefully considered in the paediatric population.
摘要：
背景：评估不同临床问题对儿童心脏计算机断层扫描期间获得的辐射剂量的影响。
方法：共116名儿童在第三代双源CT扫描仪上接受心脏CT检查。临床问题分为三大类：z轴扫描的程度，冠状动脉评估和心功能评估。从CT扫描仪协议中记录以剂量长度乘积（DLP）表示的辐射剂量值，以mGy*cm表示。
结果：在心脏功能评估的病例中，剂量明显更高（中位数DLP348对59mGy*cm，p＆lt;0.01）和冠状动脉评估的病例（中位数DLP133与71mGy*cm，p<0.01)。
结论：最重要的因素是心功能的评估，其中要求进行心功能评估的患者的中位辐射剂量高4.3倍。我们强烈建议在儿科人群中仔细考虑对心脏CT的临床要求。
方法：共116名儿童在第三代双源CT扫描仪上接受心脏CT检查。临床问题分为三大类：z轴扫描的程度，冠状动脉评估和心功能评估。从CT扫描仪协议中记录以剂量长度乘积（DLP）表示的辐射剂量值，以mGy*cm表示。
结果：在心脏功能评估的病例中，剂量明显更高（中位数DLP348对59mGy*cm，p＆lt;0.01）和冠状动脉评估的病例（中位数DLP133与71mGy*cm，p<0.01)。
结论：最重要的因素是心功能的评估，其中要求进行心功能评估的患者的中位辐射剂量高4.3倍。我们强烈建议在儿科人群中仔细考虑对心脏CT的临床要求。
