To analyze the imaging quality and radiation injury risk control of 16-slice mobile CT low-dose scanning in the head of children aged 14 years and below with craniocerebral diseases.

A total of 180 children aged 14 and below with craniocerebral diseases were admitted in the Radiodiagnosis Department of the 7^th Medical Center of the PLA Hospital and the Brain Center of Langfang Edburg Hospital from March 2017 to January 2020, including 20 children aged 0-3 years and 160 children aged 4-14 years. The low-dose imaging quality of 16-slice mobile CT was observed. At the same time, the volume CT dose index (CTDIvol), dose length product (DLP) and human effective dose (ED) of the 0-3 years old group (10 cases), the 4-14 years old group (20 cases), and the adult group (20 cases) were collected. Twenty adult patients with 8-slice mobile CT and 64-slice large CT scans were selected in the same period from the Radiodiagnosis Department of the 7^th Medical Center of the PLA Hospital for comparison and analysis of the changes of three different types of radiation dose indicators.

The imaging quality of low-dose head scan in children aged 14 years and below is stable and meets the requirements of clinical diagnosis. The comparison of radiation dose indicators shows that the CTDIvol and DLP values of the adult group were significantly different from those of the 0-3 year old group and the 4-14 year old group, while the ED values of the 3 groups were not statistically significant (P>0.05). The CTDIvol, DLP and ED values in the 16-slice mobile CT adult group were significantly different from those in the 8-slice mobile CT group and 64-slice large CT group (P<0.05).

The low-dose scan of 16-slice mobile CT in children aged 14 years and below had no significant effect on the image quality, but the radiation dose index decreased significantly, which effectively controlled the risk of radiation injury.