Low dose CT scanning and post-processing technique in the application of infant non-metal foreign bodies in trachea / 中国耳鼻咽喉头颈外科

ABSTRACT

OBJECTIVE Discuss the diagnostic value of MDCT low-dose scan and post-processing technique in the infant non-metal foreign bodies in trachea. METHODS The CT imaging data of 48 cases in our hospital diagnosed as infant non-metal foreign bodies in trachea were analyzed. The scanning parameters of 128 slice spiral CT were 100 kV, 30-40 mA, layer thickness 0.9 mm, pitch 1.4. The obtained CT data were processed for multiplanar reconstruction (MPR), minimum density projection (Min-IP) and CT simulation endoscopy (CTVE). The results of CT and bronchial endoscopy were compared. RESULTS All of the low dose CT scanning image of the 48 cases met the diagnostic requirements. The detection rate of CT and bronchial endoscopy for foreign bodies had no statistical difference. For the three kinds of post-processing techniques, the detection rate of MPR and Min-IP had no statistical difference, but the detection rate of MPR and Min-IP were higher than that of the CTVE. CONCLUSION Spiral CT and postprocessing technique can accurately diagnose and localize the infant non-metal foreign bodies in trachea. It can clearly show the size and location of the foreign bodies in trachea. It has great practical value.