Recent studies suggest a causal link of childhood leukemia and brain tumor with repeated computed tomography (CT) scans. The reasons why frequent CT scans are taken in a specific child remain unclear. The present study aimed to clarify the medical reasons why frequent CT examinations in children, and the characteristics of the diseases of those children that required multiple CT scans. A long-term follow-up retrospective study was conducted over a 12.75-year period at a single institution. Radiological reports were investigated that contained the indications for the CT scans. The clinical indications were classified for the examination of children under 16 years of age who underwent more than three CT scans into trauma, tumor, inflammation, and others. This study showed that 8.5% of CT examinations were done three times or more. The numbers of patients by indication were 23.3% for trauma, 5.3% for hydrocephalus, and 2.3% for appendicitis. The frequencies of trauma and inflammation decreased rapidly with an increasing number of CT scans. In particular, hydrocephalus brought high frequency more than ten scans. Regarding the frequencies of clinical indications by age groups, there was a significant difference (p<0.05). The near-13-year follow-up study indicated the main clinical indications for frequent CT scans in children were trauma and hydrocephalus. Multiple follow-up CT scans in children with hydrocephalus would be traded off against the resultant increase in brain tumor risk associated with CT exposure.

最近的研究表明，儿童白血病与脑肿瘤之间存在因果关系，需要反复进行计算机断层扫描（CT）扫描。目前尚不清楚对特定儿童进行频繁CT扫描的原因。本研究旨在阐明儿童频繁进行CT检查的医学原因，以及需要多次CT扫描的那些儿童的疾病特征。在单个机构中进行了为期12.75年的长期随访回顾性研究。对放射学报告进行了调查，其中包含CT扫描的指征。对16岁以下的儿童进行了三项以上的CT扫描，以检查其创伤，肿瘤，炎症及其他方面，对这些临床适应症进行了分类。这项研究表明，8.5％的CT检查进行了3次以上。有指征的患者中，创伤患者为23.3％，脑积水为5.3％，阑尾炎为2.3％。随着CT扫描次数的增加，创伤和发炎的频率迅速下降。特别是脑积水带来了十多次扫描的高频率。关于按年龄组划分的临床指征频率，存在显着差异（p <0.05）。这项为期近13年的随访研究表明，儿童频繁进行CT扫描的主要临床指征是创伤和脑积水。脑积水患儿的多次随访CT扫描将与导致CT暴露相关的脑瘤风险增加之间权衡。随着CT扫描次数的增加，创伤和发炎的频率迅速下降。特别是脑积水带来了十多次扫描的高频率。关于按年龄组划分的临床指征频率，存在显着差异（p <0.05）。这项为期13年的随访研究表明，儿童频繁进行CT扫描的主要临床指征是创伤和脑积水。脑积水患儿的多次随访CT扫描将权衡与CT暴露相关的脑瘤风险的增加。随着CT扫描次数的增加，创伤和发炎的频率迅速下降。特别是脑积水带来了十多次扫描的高频率。关于按年龄组划分的临床指征频率，存在显着差异（p <0.05）。这项为期近13年的随访研究表明，儿童频繁进行CT扫描的主要临床指征是创伤和脑积水。脑积水患儿的多次随访CT扫描将与导致CT暴露相关的脑瘤风险增加之间权衡。这项为期13年的随访研究表明，儿童频繁进行CT扫描的主要临床指征是创伤和脑积水。脑积水患儿的多次随访CT扫描将权衡与CT暴露相关的脑瘤风险的增加。这项为期13年的随访研究表明，儿童频繁进行CT扫描的主要临床指征是创伤和脑积水。脑积水患儿的多次随访CT扫描将权衡与CT暴露相关的脑瘤风险的增加。