Results and analysis of examination doses for paediatric CT procedures based on a nationwide survey in China.

Objective: To report the results of a dose survey conducted across 31 provinces in mainland China from 2017 to 2018 and to analyse the dose level to determine the national diagnostic reference levels (DRLs) for paediatric CT procedures.

Methods: At least ten patients for each age group (0- < 1, 1- < 5, 5- < 10, 10- < 15 years) and each procedure (head, chest and abdomen) for each CT scanner were selected from four to eight hospitals in each province. The dose information (CTDI and DLP) was collected from the HIS or RIS-PACS systems.

[CT evaluation of bone remodeling in rabbit models with rhinosinusitis].

Objective: To evaluate the findings of computed tomography (CT) as objective markers of bone remodeling in rabbit models with chronic rhinosinusitis.

Methods: Forty-eight rabbit models were established by vaccination of staphylococcus aureus. The rabbits were divided into 3 groups according to the time of infection: group A, B and C (4, 8, 12 weeks after infection), 16 rabbits in each group.