Résumé
Objective To explore the value of ultra-large pitch Turbo Flash scan mode in the diagnosis of tracheal foreign body in infants.Methods The imaging data of 60 infants with foreign body in trachea confirmed by bronchus endoscopy were analyzed retrospectively. The 60 infants were equally divided into 2 groups according to the scanning time.For group A,the routine scan with the mode of CARE Dose 4D/CARE kV and pitch as 1.9 was performed.For group B,the scan with ultra-large pitch Turbo Flash model was performed.The scanning time,volume CT dose index (CTDIvol)and dose length product (DLP)of each patient were recorded in both groups and statistically analyzed.Results The scanning time,DLP and CTDIvol of group A and group B were statistically significant.CTDIvol and DLP of group B were significantly lower than those of group A (P＜0.05).The diagnostic accuracy of group A and B were 100%(30/30),respectively (P＞0.05).The foreign body display of group A and B were 100% (30/30),respectively (P＞0.05).Conclusion Ultra-large pitch Turbo Flash can be used to detect tracheal foreign body in infants.It can significantly reduce radiation dose,shorten examination time and obtain satisfactory image quality.