The diagnostic value of coronal airway CT scan for foreign body aspiration in children / 重庆医科大学学报

Objective; To investigate the diagnostic value of coronal airway CT scan for foreign body aspiration in children. Methods; The X rays and CT findings in 51 cases of foreign body aspiration confirmed by endoscopy were reviewed . Results; The shape and location of foreign body in 51 cases were all distinctively showed on CT images. 6 of 8 cases of tracheal foreign body aspiration and 37 of 43 cases of bronchial foreign body aspiration were diagnosed with radiographic signs. Conclusion; The coronal CT scan has a compacity of demonstrating the foreign body intensively and dinstinctively, and can be used as an important diagnostic method for foreign body aspiration.

CT Angiography in the Diagnosis of Cerebral Aneurysm: Comparison of MIP and SSD Techniques

PURPOSE: To evaluate the usefulness of CT angiography and to compare SSD(Shaded Surface Display) andMIP(Maximum Intensity Projection) in the diagnosis and preoperative evaluation of the cerebral aneurysms. MATERIALS AND METHODS: Twenty-six aneurysms in 20 patients were diagnosed on conventional angiography and surgerywas performed. For preoperative evaluation, all patients underwent CT angiography, with spiral CT for preoperativeevaluation. Using SSD and MIP techniques, the results were proccessed and compared; three radiologistsretrospectively analysed detectability, size, neck visualization, delineation of shape, direction, therelationship with surrounding vessels-including the feeding artery of the aneurysm-and intraluminal thrombicontaining calcification. RESULTS: Twenty five of 26 aneurysms (96.2%) were detected by CT angiography, while MIPand SSD depicted 25 (96.2%) and 24 (92.3%), respectively. The largest diameter of the aneurysms was 11-15mm infour cases, 6-10mm in ten, and 3-5mm in 12 (mean 7.38mm, SD=3.34). With regard to detectability, MIP led to onefalse negative result, and SSD to two false negative and one false-positive results. Aneurysm neck assessment byMIP was clear in 96.0% of cases (24/25), and by SSD in 83.3% (20/24). For the depiction of directions and feedingvessels of the aneurysms, and intraluminal thrombi containing calcification, MIP was superior to SSD, while fordepicting shape and the relationship with surrounding structures, SSD was superior to MIP. CONCLUSION: For theassessment of cerebral aneurysms, MIP is somewhat superior to SSD. The characteristics of aneurysms and theirrelationship with surrounding structures can, however, be better evaluated by combining the two techniques.