Objective:To evaluate the usefulness of fast FLAIR pulse sequence in the MRI of intraspinal canal disease.Methods:Forty-four patients with suspected intraspinal canal disease were imaged with fast FLAIR pulse sequence after routine T1 and T2 weighted imaging in a 0.5 T superconducting MR scaner.The parameters of FLAIR were TR/TI/TE=6000/1500～2000/90～120 ms.Results:There were 26 intraspinal extramedullary tumors,4 intramedullary tumors,11 myelitis,3 localized ischemic necrosis or malacia of spinal cord.The images of FLAIR pulse sequence clearly detected all lesions of the 44 cases.They were superior to routine T2 weighted images in demonstrating the extent of the lesions and their T2 signal character,expecially in inflammatory disease of spinal cord.Conclusion:FLARI is a very useful pulse sequence in the MRI of intraspinal canal disease,it may be use as an important supplement of routine T2 weighted sequence.

Objective:To evaluate the value of DSA in diagnosis of intestinal vascular malformation.Methods:The clinical and DSA characters in 8 patients with small intestinal malformation were analyzed.There were 6 males and 2 females.All patients were underwent selective and supper selective superior mesenteric inferior mesenteric or colic artery angiographies.Results:The clinical fectures:1)the main sympton is acute lower gastrointestinal bleeding;(2)the results of conventional examination were generally negative;(3)the hemoglobin was dropped down to 4～6 g/ml in a short period.DSA feactures included:(1)artery-vein fistula;(2)markedly stainning in local small intestinal walls;(3)abnormal hyperplasia and distubance of small vessels.Conclusion:DSA is the most valuable method in diognosis of atute intestinal bleeding.

Objective:To evaluate the CT value in diagnosing the fracture of paranasal sinuses.Methods:The CT and clinical findings of 300 cases with fracture of paranasal sinuses were analysed retrospectively.Results:Of 300 cases,49 cases were fracture of single sinus wall,96 cases were fractures of multiple wall in single sinus and 155 cases were fracture of multiple wall in sinuses."Teardrop sign",accumulatioun of blood at sinus cavity and changes of extraoculer muscles were found.Conclusion:Sinonasal fracture can be diagnosed by CT comprehensively and accurately,that is very important in choosing the treatment methods for sinonasal fracture.

Objective:To evaluate the efficacy of imaging diagnisis of congenital pulmonary agenesis and hypoplasia in children.Methods:The 13 cases of congenital pulmonary agenesis and hypoplasia were veritfied by bronchcscopy and operation or pathology the characteristics of the X-ray,CT and bronchography were analysed.Results:the X-ray features included:(1)capacity decreased and density increased of diseased lung;(2)small hilar pulmonis;(3)mediastinum shifted to the affected side.Conclusion:Radiography is a good procedure in diagnosis of the most cases of congenital pulmonary agenesis and hypoplasia.

Objective:To improve the understanding of X-ray manifestations of chronic renal failure with heart abnormity.Methods:The X-ray manifestations and the main pathogenic factor of chronic renal failure with heart abnormity were analysed in 87 cases.Results:Cardiac enlargement of the shape was 49.4%,of which aortic type of heart was 46.5%,type of generally enlargement was 44.2%,the mixed type of generally enlargement and mitralization was 9.3%,the rate of cardiac enlargement was growed with the increase of diastolic pressure,anemia and urea nitrogen (The Ρ value was 0.01＜Ρ＜0.05;0.01＜Ρ＜0.05;0.01＜Ρ＜0.05,respectively).Conclusion:There are no characteristic X-ray manifestations in chronic renal failure with heart abnormity,the X-ray diagnosis of which must depend on clinical data.

Objective:To explore the clinical value of X-ray and CT in detecting unusual mediastinal mass.Methods:The chest plain films and CT scans were performed in all 9 cases .Results:Nine cases proved by operation and pathology included liposarcoma(two cases),multiple neurinoma(two cases),neuroendovrine cartinoma(two cases),endodermal sinus tumor(two cases)and thymas cacinoid (one case).Conclusion:X-ray and CT can localze the mediastinal mass,CT has more significance in detecting the internal morphology of mediastinal mass and its relationship with the surrounding tissues.But there is still a limitation for X-ray and CT in detecting the quality of some mediastinal carcinomas.

Objective:To investigate the efficacy of treatment of primary hepatic carcinoma by three different interventional theraputic methods.Methods:121 cases with moderate and advanced stages of HCC were treated with PEI +LP-TAE,chemoembolization,LP,and SLPGSTAE respectively.All cases were divided into two groups according to the tumor’s size:group A(＞8 cm)and group B(≤8 cm).The efficacy and survial incidence of the three different methods were analyzed.Results:62 of the 76 cases(81%)in group A and 16 of the 45 cases(35.5%)in group B were decreased in size after the same theraputic method,two groups had statistically significant (P＜0.01).In group A,9 cases treated with chemoembolization and LP were invalid.16 of the 36 cases became smaller after SLPGSTAE.The 1,2 and 3 year surval incidence of patients in group B were 77.6%、42.1%、18.4% respectively as compared with group A were 68.8%、40.0%、11.1%.Conclusion:PEI can cause small tumors to form nerosis,SLPGSTAE cn play dual embolization role and had no servious damage to liver function.

Objective:To improve the CT and MRI diagnostic accuracy of intracranial atypical cavernous angiomas(ACA).Methods:We retrospectively analyzed CT and MRI appearances,operative and pathological findings of 12 cases with ACA.Of them,11 cases were seanned by CT,10 cases by MRI and 9 by both CT and MRI.Results:Of 12 cases:One case as located at the sella ,1 case was at the fourth ventricle,5 cases were located at the cerebral hemisphere,4 cases were located at the middle cranial fossa and 1 case was at the posterior cranial fossa.There was edema in 3 cases,1 case had cystic component and 4 cases had cerebral hemorrhage.The localized rate of ACA by CT and MRI was 100%,but 11 cases were misdiagnosis and 1 case did not made the qualitative diagnosis. Conclusion:The qualitative diagnosis of ACA have some difficulty,so that the emphasis should be on the analysis of the combination imagiology and clinic.

Objective:To measure CT linearity and evaluate if it would show linear relationship between coefficient and attenuation.Methods:The Catphan phantom was used to measure CT linearity in 18 computed tomography equipments,and the results were calculated.Results:(1)The CT linearity were qualified in 14 equipment but 4.Conclusion:(1)There are many factors which affect CT linearity.The artifact will be produced if the CT linearity is unqualified.(2)CT linearity must be calibrated periodically to assure the stability of the CT linearity and to make for the accurate diagnoses.

Objective:To describe the imaging findings of primary brain lymphoma in immunologically normal patients.Methods:The clinical manifestations and imaging findings of 5 patients operated with pathological proved primary brain lymphoma were reviewed.Results:In 5 cases,4 patients were men and one was woman.The median age was 47(range 34 to 63 years).Pathological diagnosis was compatible with primary non-Hodgkins lymphoma of brain for all five patients.Primary brain lymphoma may be soiltary or mutiple and locate at supratentorial or infratentorial.Lesions presented as an isodense to hyperdense on CT scan,hypointense on T1-weighted images and isointense or hyperintense to gray matter on T2-weighted images.Most lesions showed dense homogenous enhancement on CT and MR.Tumors associated with different degrees of mass effect.One patient received whole-body 18 FDG PET examination that presented as an intracranial hypermetabolic lesion.Conclusion:Primary brain lymphoma is a rare tumor that imaging findings overlap with those of other intracranial mass lesions,we can only make a suggestive diagnosis of primary brain lymphoma and pathological confirmation is meeded.