Evaluate the performance of Lung-RADS in pulmonary nodules screening / 实用放射学杂志

Objective To compare the performance of Lung Imaging Reporting and Date System (Lung-RADS)with National Lung Screening Trail (NLST)in pulmonary nodules screening.Methods 1 5 3 patients with pulmonary nodules were analyzed retro-spectively,including,baseline screening and after baseline screening.We compared the sensitivity,false-positive result rate,positive predictive value,and negative predictive value in two methods of screening.Results In baseline screening of all patients with pulmo-nary nodules,the sensitivity,false positive rate and positive predictive value and negative predictive value of Lung-RADS and NLST were 83.9%,13.2%,6.5%,99.7% and 92.5%,26.9%,3.8%,99.8% respectively.In after baseline screening,the sensitivity, false positive rate and positive predictive value and negative predictive value were 79.6%,5.5%,11.5%,99.8% and 93.5%,22.8%, 3.5%,99.9% respectively.Conclusion Lung-RADS classification can reduce the false positive rate in screening of pulmonary nod-ules,which reduced the screening of lower risk nodules.

The difference of detection rate of MSCT signs between T1a and T1b peripheral lung cancer / 实用放射学杂志

Objective To evaluate the detection rate of multi-slice spiral CT (MSCT)signs and the clinical value of multi-planar reconstruction (MPR)in T1a and T1b peripheral lung cancer patients.Methods Eighty-seven cases with peripheral lung cancer proved by pathology were collected.The cases were divided into T1a and T1b group based on the TNM classification.The MSCT and MPR images were compared between the two groups.Results (1)Detection rate of the deep sublobe sign,spinous process sign, short spiculated sign,pleural indentation sign,vascular convergence sign,multi-nodule accumulation sign,vacuole sign and air bron-chogram sign,were 1 1.4%,20.0%,31.4%,60.0%,25.7%,45.7%,42.9% in T1a group and 42.3%,36.5%,57.7%, 80.8%,5 1.9%,25.0%,21.2% in T1b group,respectively.The difference were all statistically significant (P < 0.05)between T1a and T1b group except that of the spiculated sign (P = 0.098).(2)The detection rate of the sublobe sign,spinous process sign, spiculated sign,pleural indentation sign and vascular convergence sign were higher on MPR images than on axial thin-slice images in both T1a and T1b group.Conclusion The detection rate of the tumor-lung interface’s signs are lower in T1a than in T1b,the detec-tion rate of internal structure signs of the tumor are higher in T1a than in T1b in peripheral lung cancer patients.MPR has important value in early diagnosis of peripheral lung cancer.

The value of digital subtraction angiography in diagnosing small intestinal hemorrhage with unknown reasons / 介入放射学杂志

Objective To discuss the diagnostic value of DSA for unknown reason hemorrhage of small intestine.Methods 25 patients with hemorrhage of small intestine were performed angiography with Seldinger's technique through superior mesenteric artery.Results Eleven cases demonstrated direct signs of hemorrhage,12 cases of indirect signs of hemorrhage and 5 with both of the signs.The positive rate of hemorrhage was 72% including 10 cases of tumor(6 leiomyomas,2 leiomyosarcomas,1 interstitial tumor,1 small intestinal cancer),4 cases of Meckel's diverticulum,3 cases of vascular malformation and 1 case of inflammation.The coincidence rate of positive cases with pathology was 75%and the diagnostic accuracy of localization was 100%.Conclusions DSA angiography is very helpful for determining the location and chara-cter of unknown reason hemorrhage of small intestine.(J Intervent Radiol,2006,15:221-223)