P o sters 127 Feasibility of Low - Dose Multi - detector Computed Tomography in Follow Up of Patients with Severe Emphysema after Airway Bypass - A Novel Bronchoscopic Procedure for Severe Emphysema

Purpose: To assess the visualization of different coronary stents using 16and 64-slice multi-detector computed tomography (MDCT) coronary angiography. Materials and Methods: Ten different coronary artery stents commercially used in Korea were placed in a vascular phantom and examined with a 16and 64-slice MDCT; for image reconstruction, a standard medium-soft (B30f) kernel and a stent-optimized (B46f) kernel were used for the visualization of coronary artery stents. We analyzed the artificial luminal narrowing (ALN), intraluminal attenuation and artifacts by the stent according to the stent materials, kernels, and CT machines. We used a t-test, ANOVA with SNK method, and linear regression for statistical analysis. Results: Although ALNs were different according to 16and 64-slice MDCT with B30f and B46f kernels, a 64-slice MDCT with B46f kernel showed statistically the lowest ALNs as compared to other protocols. The attenuation values within the stents were significantly lower when using B46f kernel than when using B30f kernel regardless of 16or 64-slice MDCT. Mean artifact scores by the stents were not different according to two machines and two kernels, but they were significantly lower in the cobalt-chromium alloy stents than in the stainless steel 316L stents. There was a moderate correlation between artifact scores by the stents and the strut thickness of the stents, but no correlation between artifact scores and stent diameter. Conclusion: Using the 64-slice MDCT with a B46f kernel might be useful for the coronary artery stent visualization. In addition, cobalt-chromium alloy stents with thin strut thickness can supply the superior visualization of stent lumen as compared to the stainless steel 316L stents with thick strut thickness. Pleural Interventional Procedures for Thoracic Radiologists KANG EY, Woo OH, Yong HS, Oh YW, Park CM, Cha IH Purpose: This exhibit is to review and illustrate the interventional procedures in patients with pleural diseases for thoracic radiologists. Principal information: In clinical practice, pleural diseases are very common and thoracic radiologists play a crucial role in the imaging and management of pleural diseases. Radiologic modalities can be used to guide pleural interventional procedures. Thoracic radiologists perform frequently interventional procedures such as thoracentesis, drain catheter placement and pleural biopsies using CT and ultrasound. Diagnostic and therapeutic thoracentesis is required for pleural effusions and ultrasound assesses the presence of pleural disease and evaluates pleural effusion with septa and loculations. Ultrasoundguided thoracentesis improves the success and decreases complications. Complicated pleural effusion includes unilocular or multilocular parapneumonic effusions, empyema, malignant effusions, and hemothoraces. Drainage of complicated pleural effusions is necessary to control pleural infection, allow re-expansion of the lung, and prevent the long-term sequela of pleural fibrosis and lung entrapment. Image-guided drainage catheter insertion is very convenient for patients with complicated pleural effusion. Imageguided pleural biopsy shows a high diagnostic yield for focal or diffuse pleural lesions. Conclusion: Radiologic imaging investigates easily the pleural disease, and ultrasound and CT are most useful modalities for intervention in pleural disease. Thoracic radiologists perform accurately interventional procedures using image-guidance, and image-guided pleural interventional procedures are very convenient and comfortable for patients than non-image guided or invasive surgical procedures. W ITH DR AW N