Objective To evaluate the scan technique and clinical value of multi-slice spiral CT angiography(MSCTA) of coronary artery.Methods MSCTA was performed in 86 patients,and 25 of them were also investigated with selective coronary angiography(SCA).The imaging quality of MSCTA in different scanning condition were analyzed.The patency of coronary artery and other branches were examined.The distribution and extent of coronary arterial stenoses were assessed.The findings demonstrated on MSCTA were compared with those seen on SCA.Results(1)The imaging quality on MSCTA of coronary artery was significant better in patients with a heart rate below 60 beats per minute,contrast flowing rate 3.0~3.5 ml/s,volume 120~150 ml and delayed time 22~25 s;(2)in 25 cases,of 71 coronary artery and branches without stenoses examined with MSCTA,68 had identical appearance on both MSCTA and SCA.The distribution and extent of 19 coronary arterial stenoses revealed by MSCTA were correlated exactly with SCA in 29 coronary arterial stenoses.The negative and positive predicted value were 95.8% and 65.5% respectively.Sensitivity,specificity and accuracy were 86.4%,87.2% and 87.0% respectively.Conclusion MSCTA as a noninvasive examination is a valuable method in detecting diseases or variations of coronary artery.

3.36,P30 voxels). Radioactive increases in BA11,44,8,9,45,left globus pallidus,orbital gyrus,frontal lobe and cerebellar hemisphere. Radioactive decreases in BA18,19,25,right post limb of internal capsule and periaqueductal gray matter.To these metabolizing changes of brain, radioactive increases in globus pallidus,orbital,frontal gyrus, cerebellar hemisphere and Radioactive decreases in bilateral occipital lobes,callosum were considered as the response to the acupuncture modulating within the human brain.Conclusion PET/CT imaging of brain function is useful method in exploring acupuncture mechanisms of brain.

Objective To evaluate the diagnostic and differential value of triphasic, especially the arterial phase, contrast enhanced CT scans for the hepatocellular adenoma, and to improve CT diagnostic accuracy. Methods Spiral CT scanning of pre and post contrast arterial phase, portal venous phase and delayed phase was performed in 5 patients with hepatocellular adenomas proved surgically and pathologically. The enhancement was administrated with venous injection of 3 ml/sec, totally 100 ml angiografin. Arterial phase of contrast enhanced scanning started 20～30 sec, portal venous phase 60～70 sec and delay scanning 3 min after the injection of contrast medium. The degrees of the enhancement of adnoma and normal tissues of liver in the three contrast enhanced phases were calculated and compared statistically. Results In plain CT, the lesions were iso density in 4 cases and slight hypodensity in 1 case, which was hardly distinguished from the normal tissue. In all 5 cases, the lesions showed marked enhancement in the arterial phase compared with normal tissue of liver (38 HU high), and there were markedly statistical difference ( t =18 94, P 0.05). The mean CT value of hepatocellular adenoma in the arterial phase was much higher than that in portal venous and delay phase, there were statistical differences between them ( F =18.39, P

Objective To explore the value of magnetic resonance perfusion imaging of 3D arterial spin labeling(3D-ASL)in the diagnosis of transient ischemic attack(TIA).Methods 78 of patients were diagnosed TIA on MR routine scan [T1 WI,T2 WI,T2-FLAIR,diffusion weighted imaging(DWI)],magnetic resonance angiography(MRA)and 3D arterial spin labeling(3D-ASL).The re-sult were analyzed by Chi-square test.Results In 78 patients,the abnormal routine scan was 0 case(0%);abnormal MRA 41 cases (52.6%);abnormal 3D-ASL 47 cases(60.2%);combination with each other were 60 cases(76.9%).29 cases with artery stenosis and abnormal ASL,12 case with artery stenosis and normal ASL,19 cases with normal vascular and abnormal ASL,18 cases with normal vascular and normal ASL.Conclusion 3D-ASL is better than routine magnetic resonance sequences in the diagnosis of TIA,which is convenient and should be a routine scanning sequence of TIA.3D-ASL,MRA and DWI have their own advantages and disadvantages, combination use can improve the diagnosis accuracy of TIA.

Objective To study the curative effect of internal thoracic arterial chemoembolization in the treatment of advanced lung cancer.Methods Internal thoracic artery was confirmed to be the main supplied artery by digital substraction angiography(DSA) in 8 cases with lung cancer. The internal thoracic artery was embolized by stainless steel coil below the supplied segment in order to avoid the normal vascular territory occlusion.Then iodized oil combined with Cis-Diaminedichloroplatinum(DDP) and mitomycin(MMC) were injected into the supplied segment slowly until blood flow stopped,at last,the gelfoam sponge sheet was inserted into this supplied segment to decrease the wash of iodized oil by blood flow.Results Clinical symptoms were improved obviously in all cases after therapy.CT scans showed that iodized oil accumulated in the tumor better four weeks after the chemoembolization. Conclusion For these cases with advanced lung cancer which the blood supply mainly by internal thoracic artery,it is necessary to perform chemoembolization.

Objective To assess the cli ni cal usefulness of dual-modality positron emission tomographic (PET)-computed t omographic (CT) imaging in pulmonary lesions. Methods Fo rty-nine patients with pulmonary lesions examined with ?~2 test. Results There were 50 primary lesions in 49 patients. Accuracy, sensitivity, specificity, positive predictive value (PPV), and negative predict ive value (NPV) were 90.0%, 95.2%, 62.5%, 93.0%, and 71.4%, respectively wi th PET-CT, 74.0%, 76.2%, 62.5%, 91.4%, and 33.3%, respectively with CT. There was significant differences between them (P0.05). Conclusion PET-C T has an important clinical value in differentiating benign lesion from malignan cy and staging in lung cancer.

Objective:To analyze the diagnostic value of magnetic resonance cholangiopancreatography (MRCP) for extrahepatic biliary obstruction.Methods:MRCP images of 52 patients with extrahepatic biliary obstruction disease were retrospectively reviewed to conclude the lumen morphological abnormalities of benign versus malignant bile duct obstructions,which were confirmed by pathology and clinic observation.Results:MRCP could correctly identify the degree of ductal dilatation and the level of obstruction in all cases.The bile duct of 27 cases of benign biliary obstruction presented regular and symmetric dilation,gradual tapering.The dilatation degree of extrahepatic bile duct was significantly bigger than that of intrahepatic bile duct,the dead-wood sign was seen in intrahepatic bile duct.The bile duct of the 25 cases of malignant biliary obstruction presented abrupt narrowing or inerruption,dilatation,and had double-duct sign.The dilatation degree of extrahepatic bile duct was same as intrahepatic bile duct.The dilatation degree of extrahepatic and intrahepatic bile duct in malignant biliary obstruction group was more serious than that in benign biliary obstruction group.Conclusion:MRCP is the noninvasive technique of choice with high accuracy for patients with extrahepatic biliary obstruction disease.

Objective To assess the role and its tecnhique superiority of 64-slice spiral CT angiography(CTA) in lower limb arterial diseases.Methods MSCT studies in 33 cases suspected diseases of lower limb arteries was performed,the helical scans covered the extent of renal artery to the artery of the lower extremity.3D reconstruction of vessel was done in Wizard workstation.The manifestations of MSCTA were compared with that of conventional angiography . Results Of the 693 segments of arteria , 683 were assessable on both DSA and CTA.Using the DSA images as the standard reference,the sensitivity,specificity and accuracy of CTA were 97.6%(95% CI,94.9%~100.7%),98.9%(95% CI,98.0%~99.8%),98.7%(95% CI,97.9%~99.5%)in detecting the segments occluded . With the regard the detection of segments that had more than moderate stenosis , the sensitivity , specificity and accuracy of MIP were 98.9% ( 95% CI , 97.4%~100.4%),99.4%( 95% CI, 98.7%~100.1%) and 99.3%(95% CI, 92.4%~99.9%).Conclusion In assessment of diseases of lower limb arteries with 64-slice spiral CT angiography is equal to DSA basically, it is a highly accurate and non-invasive angiography in diagnosing arterial diseases of the lower extremities.

0.05).Conclusion In ensuring the prerequisite of the image quality,using correct scanning technique can appropriately decrease the dose of contrast agents in coronary CTA examination.

Objective To study the value of 64-slice spiral CT digital subtraction technique in the diagnosis of intracranial aneurysms.Methods 36 patients with subarachnoid hemorrhage underwent 64-slice spiral CT examination,including unenhanced CT scan and enhanced CT scan.The image data were used to reconstruct the conventional CTA and digital subtraction CTA(DSCTA).Then the differences of image quality and diagnostic efficiency between the CTA and DSCTA were compared based on the standard of DSA . Results There were 40 intracranial aneurysms in 36 patients . 40 aneurysms were detected completely by DSCTA,the sensitivity and specificity of the DSCTA were both 100% . 37 aneurysms were detected by CTA , and the sensitivity and specificity were 92.5% and 100%,respectively.There was significant difference in image quality between CTA and DSCTA(P＜0.01).Conclusion DSCTA with 64-slice spiral CT might be the first diagnostic tool in screening intracranial aneurysm.