Effect of different positioning images on the radiation dose and image quality of abdominal CT in children under DoseRight technology

ObjectiveTo compare the effects of the anteroposteric, lateral and dual positioning images on the image quality and radiation dose in children abdominal CT examination under DoseRight technology.

MethodsThe data of abdominal CT examination in 388 children aged 1-17 years were prospectively analyzed.According to the age, the children were divided into the 1-6 years old group(group A), 7-12 years old group(group B) and 13-17 years old group(group C).The children in each group were assigned to the anteroposteric, lateral and double positioning groups by random number method.The Philips 128 iCT was used for the data collection, the scan range and volume CT dose index(CTDIVOL) were recorded, the size-specific dose estimate(SSDE) were calculated, and the image qualities were subjectively and objectively evaluated in three groups.

ResultsThe differences of CTDIVOL and SSDE among three groups were statistically significant(P < 0.01), which in anteroposterior positioning group were higher than those in lateral positioning group, and which in lateral positioning group were higher than those in dual positioning group(P < 0.05).The subjective scores of the image quality in three groups were more than or equal to 3 points, which met the diagnostic requirements.There was no statistical significance in the subjective score of image quality among three groups(P>0.05).

ConclusionsThe application of dual positioning images in children abdominal CT examination can accurately control the scan range, reduce the radiation dose and ensure the image quality.