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| Radioprotective Value of Low Dose Multi-slice CT in Pediatric Patients with Foreign Body in Trachea and Bronchi |
| TANG Qun-feng, CHENG Hong-wei, WU Li-yuan, et al |
| Department of Radiology, Wuxi People's Hospital, Wuxi 214000 China |
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Abstract Objective To investigate the radioprotective value of low dose multi-slice spiral CT (MSCT) in pediatric patients with foreign body in trachea and bronchi compared with conventional dose.Methods 80 children suspected airway lesions were prospectively studied with low dose MSCT and randomly divided into four groups (50mA, pith=3;50mA, pith=6;30mA, pith=3;20mA, pith=3) averagely.Results The weighted CT dose index (CTDIw) and dose length product (DLP) in low dose group was lower than in conventional dose group with the significant difference (P<0.01).The imaging quality in low dose group was mostly better with no the significant difference (P>0.05), but inferior to conventional dose group, while there is no poor images to influence the diagnosis of foreign body in trachea and bronchi.There was no significant difference (P>0.05) between post processing images with different doses.Conclusion The low dose scanning will be accuracte in diagnosis of foreign body in trachea and bronchi, and beneficial to protect the children with lower radiation dose.The 20mA to 50 mA tube currents may be used as conventional dose for evaluating foreign bodies in the airways in the children.
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Received: 26 June 2008
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