Application of organ dose modulation technique in CT scanning of children paranasal sinus / 中国医学影像技术

ABSTRACT

Objective: To explore the effect of organ dose modulation (ODM) technique on radiation dose of orbit area and image quality in children paranasal sinus CT scanning. Methods: A total of 65 children with suspected paranasal sinus lesions requiring CT scanning were prospectively collected. The children were divided into 2 groups according to the order of visit, i.e.control group (n=27) received conventional CT scanning, and observation group (n=38) received conventional CT scanning with orbital ODM technique. The distribution of tube current in different direction (anterior/left/posterior/right) of orbital region was analyzed, and the differences of contrast to noise ratio of images and effective radiation dose were compared between 2 groups. Results: The tube currents of orbital anterior direction in observation group([127.39±17.98]mA) was lower than that in control group ([141.00±26.46]mA, t=2.47, P=0.02), while no statistical difference of tube current of orbital posterior, left, right direction was found between groups(t=-0.38, -0.90, -0.90, all P>0.05). There was no statistical difference of contrast to noise ratio of images nor effective radiation dose between 2 groups (t=-1.44, 1.21, both P>0.05). Conclusion: Application of ODM technique in children paranasal sinus CT scanning can effectively reduce the local tube current in the anterior direction of orbital region and reduce the radiation dose in the orbital region without affecting image quality.