Objective To investigate the value of monochromatic curve features parameters in assessing various types of upper urinary calcium calculi in vivo on dual-energy CT(DECT).Methods Total 55 calcium calculi underwent dual-source CT in dual-energy mode were analyzed retrospectively.According to the result of infrared spectrometer,four types of calcium calculi were seen in this study:group 1(COM,12),group 2(COM+COD,9),group 3(COM+CaP,8),group 4(COM+COD+CaP,26).For each stone,mono-chromatic images from 40 keV to 190 keV(interval of 10 keV)were reconstructed.We used the different single spectral CT values and curve slope to differentiate of various types of calcium calculi.Results The parameters of the different single spectral CT values and curve slope were significantly different among the four groups.110 keV could differentiate the most groups.The curve slopes of group 1 with group 2 and group 3,group 2 with group 4,group 3 with group 4 were significantly different.Conclusion The spectral curve features parameters is helpful in the characterization of various types of calcium calculi.

Objective To approach the clinical applied value of MSCT coronary angiography in detecting coronary artery disease. Methods 150 patients underwent MSCT coronary angiography, of them, 100 patients were also examined by coronary arteriography. The ability in showing coronary arteriae with MSCT was evaluated comparatively with coronary arteriography. Results The success-ful rate in showing coronary arteriae by MSCT was 95.3%,the excellent rate of images was 82.970%. There was negative correlation between image quality and heart rate(r=0.938). And the accurate rate in evaluating the narrowing of coronary arteriae was 91.2% with MSCT. There was no significant difference in detecting the narrowing of coronary arteriae with MSCT and coronary angiography (P>0.05). Conclusion By controlling the patients' heart rate(below 70/min) and optimizing the technical methods,MACT coro-nary angiography can detect all of the 1～3 branch of coronary artery. MSCT has some particular superiority in diagnosing coronary artery disease and evaluating the effects of coronary artery bypass graft.

Objective To investigate the methods and clinical value of multi-slice CT virtual cholangioscopy in the detection of biliary calculus.Methods Volume scanning was performed in 38 patients with suspected biliary calculi after injection 50% Meglumine adipiodone injection 20 ml through vien.All data sets were transferred to ADV3.1 workstation.MSCTVC reconstruction were done with Navigator soft-ware.All cases were proved by ultrasound,axial CT and MSCT 3 D results or operations.Results MSCTVC could well demonstrate 3D fashion of biliary calculi and it was similar to ultrasound,axial CT and MSCT 3D results.Conclusion MSCTVC combined with CT 2D 3D results has a high diagnosis accuracy and clinical usefulness,thus,improve the diagnosis of biliary calculi.

Objective To evaluate the methodology and the clinical usefulness of multi-slice helical CT virtual endoscopy(MSCTVE).Methods Twenty-six cases by suspected colorectal carcinoma underwent multi-slice helical CT virtual endoscopy after colon was cleaned and insufflated with air.The parameters were used:120 kV,250 mA,pitch 6,reconstructure thickness 2.5 mm,interval 1.0.All data sets were transferred to ADV 3.1 workstation,CTVE reconstruction were done with Navigator and used CTVE to view colorectal and rectum carcinoma.Of 26 cases,16 cases were proved by colonoscopy and 22 cases by operation.Results 14 cases carcinoma in rectum,8 cases in sigmoidcolon,1 case involved both rectum and sigmoidocolon.MSCTVE results were similar to colonography.Conclusion Multi-slice helical CT virtual endoscopy has clinical usefulness for detecting colorectal and rectum carcinoma as it is non-invasive,safe,feasible.MSCTVE is a supplement to colonoscopy especial in incomplete colonoscopy.

Objective To assess feasibility of three-dimensional(3D) reconstruction techniques and virtual gastroscopy of CT(CTVG)in diagnosing gastric tumors.Methods 22 cases doubted with gastric lesions were scaned by mutislice helic CT and reconstructed into CTVG and 3D images.The results were compared with fiberoptic gastroscopy(FG) and all of the cases were sure with gastric lesions and biopsied by gastroscopy or surgery operation.Results 22 patients was examinated successfully,and the lesions was proved by pathology of FG or operation.According to location and shape of lesions,there were more ulcer type(16) and more located at gastric antrum(14) in this specimen.Both CTVG and FG had one misdiagnosis respectively.Conclusion CTVG combined with 3D of MSCT is same sensitivity and specificity as FG.

Objective To study the correlation of measuring bone density for diagnosing osteoporosis between VQCT and DXA. Methods 50 patients were measured bone density coinstantaneous by DXA and VQCT. All of the data was saved in computer and analyzed by SPSS soft.Results According to WHO criterion 14 patients were osteoporosis by F-DXA and 9 by S-DXA,and 23 by VQCT.The percent was respective 28%,18% and 46%. The results of VQCT were significantly different from the results of F-DXA and S-DXA (?

Objective To study the diagnostic value of coronary disease with 16-slice spiral CT.Methods 35 patients with coronary heart disease(CHD) were divided into two groups according to the risk rate of CHD:group 1 with acute coronary artery syndrome(ACS)(including acute myocardial infarction,AMI;unstable angina,UA);group 2 with stable angina(SA).They were studied by 16-slice spiral CT(retrospectively ECG-gating,0.5 s ratation),the images were reconstructed by survey methods to display the coronary artery atherosclerosis plaques,then to evaluate the nature of plaques by detecting CT value of plaque(using the standard of the CT value of the coronary artery atherosclerosis plaque of Schroeder)and to analyze the degree of the stenosis of coronary artery caused by the different type of plaque.Results There were 19 soft plaqes,11 middle plaques and 7 calcification plaques in ACS group;3 soft plaqes,3 middle plaques and 11 calcification plaques in SA group.There was a positive relation between soft plaqes and middle plaques with the risk rate of CHD,especially soft plaque(P

Objective To investigate the correlation among mammographic features, and estrogen /progesterone receptor(ER,PR) of the breast cancer.Methods The mammographic features of 60 cases of breast cancer confirmed by surgery and histology were analyzed retrospectively. The specimens of mastectomy of the breast cancer were stained with immunohistochemistry,the expression of estrogen receptor (ER) and progesterone receptor (PR) were measured .The relationship between the immunohistochemical pathologic results and mammographic features were analyzed. Results Among the 60 cases of breast cancers, X-ray types mass of breast cancer were correlated with the expression of PR (P

Objective To evaluate the value of multislice spiral CTA in diagnosis of intracranial aneurysm.Methods CTA data in 32 patients with intracranial aneurysms proved by operation and DSA were retrospectively analysed in comparison with the results of DSA.Results 38 aneurysms in 32 patients were detected by DSA and operation.Six cases of 32 had two aneurysms.36 and 34 aneurysms were detected by DSA and CTA respectively.4 aneurysms located at anterior communicating artery,7 at middle cerebral artery,9 at posterior communicating artery,14 at internal carotid artery and 4 at basilar artery.Conclusion MSCTA can be used as the method in screening intracranial aneurysms for surgery and interventional therapy.

Objective To study the value of clinical applications of multi-slice spiral CT(MSCT)3D reconstruction and MPR in knee joint traumatic fracture and the imaging technique of multi-slice spiral CT 3D.Methods 24 cases underwent MSCT and all data sets were done 3D and MPR in ADW 3.1 workstation.Results 3D reconstruction can indicated the site,direction of alignment,fracture degree,colapse,displacement length of trauma knee joint,MPR can viewed damage inside the bone.Conclusion 3D reconstruction and MPR has high application value in clinical diagnosis and choosing therapy methods.