Objective To explore the value of multi-slice spiral CT (MSCT) with three dimensional (3D) postprocessing for assessing the lung volume and compare it with pulmonary function test (PFT). Methods In 60 cases, there were 34 healthy controls and 26 patients with emphysema. CT scan and PFT were performed within 3 d in all case. The total lung was respectively scanned at the end of full inspiration and full expiration, using GE Lightspeed 16 slices spiral CT. The total lung volumes and voxel index (VI) at threshold range of -1023 Hu to -900 Hu were measured by pulmonary quantitative software of AW4.2 workstation. Results The full expiration volume(Vex) significantly correlated with residual volume(RV) (r=0.908) as well as the full inspiration volume (Vin) with total lung capacity (TLC) (r=0.897). The value of (Vin-Vex) well correlated with forced vital capacity(FVC), as well as Vex/Vin with RV/TLC, VI Ain with TLC, VI Aex with RV. Conclusion Significant correlation of lung volume accessed by MSCT with 3D technique with PFT is useful for assessing the pulmonary function.

Objective To create a further understanding of the angiographic features of the carotid artery pseudoaneurysm (CAPA) and to explore the clinical diagnostic value of angiography.Methods Sixteen cases of CAPA with clinical and angiographic data were analyzed retrospectively. The angiographic appearances in all of the patients were observed dynamically and precisely with a double blind method by two experienced radiologists together and formed a consensus interpretation. Results Angiography provided a definite diagnosis for all cases. The parent arteries included the common carotid artery (1 case), common carotid artery bifurcation (9 cases), internal carotid artery (5 cases) and external carotid artery (1 case). The angiographic features of the CAPA were: All cases showed the contrast media retension in the aneuysms; turblulent flow within aneurysm in 9 cases; the “jetting sign” at the leak of the parent artery in 7 cases; increase angulation of the bifurcation of internal and external carotid arteries in 12 cases.Conclusions Angiography is the most valuable examination method in diagnosis of CAPA, and it can not only provide definite diagnosis, but also play an important role in selection of therapeutic plan.

Objective To explore the value of angiographic diagnosis and interventional therapy for Takayasu arteritis. Methods Thirty-eight patients with Takayasu Arteritis (TA)(11 men, 27 woman; aged 8-54; average age, 30.5?18) undergone angiography were analyzed retrospectively. The angiographic appearances in all of the patients were observed dynamically in a double blind method by two experienced radiologists together and formed a consensus interpretation. Results According to the classification of Lupi-Herrea, typeⅠwas found in 11 cases, typeⅡin 15, typeⅢin 7 and typeⅣin 5 by angiography. Among 38 patients the arterial involvement ineluded subclavian artery in 20 cases (52.6%), the abdominal aorta in 15 cases (39.5%), the renal artery in 14 cases (36.8%), thoracic aorta in 10 cases (26.3%), carotid artery in 9 cases (23.7%), iliac artery in 9 cases (23.7%), axillary artery in 7 cases (18.4%), superior mesenteric artery in 4 cases (10.5%), coronary artery in 3 cases (7.9%), pulmonary artery in 3 cases (7.9%), and so on. Percutaneous transluminal angioplasty was performed in 22 cases and the stent placement was managed in 12 cases successfully. Conclusions Angiography is one of the ideal and reliable methods for the diagnosis and guidance of the interventional treatment for TA, and the latter is a mini-invasive and effective way for TA.

Objective To explore the value of imaging diagnosis on complications after kidney transplantation. Methods The radiologic appearances of 165 patients with postoperative complications were reviewed in a double blind method by two experienced radiologists. Results In the 158 patients with postoperative pulmonary infections, the main etiological causes according to their frequency were bacteria,fungus,virus,and so on. The postoperative pulmonary infections of the patients with renal transplantation were diagnosed as normal(28,17 7%),increased lung markings(44,27 8%) and pulmonary infection(84,53 2%) by chest X-rays and CT. The renal artery stenosis after kidney transplantation was diagnosed in 5 cases, and thrombosis of pancreas blood vessel after operation of simultaneous pancreas-kidney transplantation was diagnosed in 1 case by DSA. Conclusions Radiography and CT scan are very useful in the clinical diagnosis of postoperative pulmonary infections in the patients with renal transplantation,and radiography should be the first choice for the imaging diagnosis. DSA is one of the ideal and reliable measns to diagnose the postoperative vascular complications in kidney transplant recipients.

Purpose: To summarize the efficiency and the experience of the puncture aspiration and sclerosing therapy of hepatic and renal cysts. Materials and methods: 27 patients were treated with percutaneous aspiration and alcohol injection of the cystic cavity using 20G Greene needles. Among the 27 patients, 11 were with hepatic cyst, 15 with renal cyst, and 1 with polycystic kidneys. The size of cysts ranged from 3.5 to 12 cm, and the amount of aspirated fluid varied from 21 to 550ml. Pure alcohol (99. 7%) was injected into the cavities after apiration. Results: All the puncture procedures were successful, and no major complications occurred, The clinical symptoms were relieved or disappeared after the treatment. 18 cases were followed for 3 months to 5 years. The efficient indices: Grade I one case (polycystic kidneys), Grade Ⅱ 4 cases and Grade Ⅲ 13 cases. Conclusion: CT guided percutaneous puncture aspiration and sclerosing treatment of hepatic and renal cysts can be considered as an effective alternative to surgical treatment. The simple aspiration of polycystic kidneys is very helpful in relieving symptoms and improving renal functions.

Objective To analyze the clinical and CT characteristics of pancreatic metastasis to improve the correct diagnosis rate.Methods The clinical and CT data of 14 patients with pancreatic metastasis were reviewed retrospectively.Results Among the 14 patients,the primary malignancy was lung cancer in 6 cases,renal carcinoma in 3 cases,colon carcinoma in 2 cases,laryngeal cancer in 1 case,gastric cancer in 1 case and ovarian carcinoma in 1 case.Pancreatic metastases from renal carcinomas often developed a long period after initial nephrectomy and survived for a relatively long time.Abdominal CT plain scan and enhanced scan was performed in all cases.Four cases were of solitary type,9 cases were of multiple types and 1 was of diffuse type.Totally 28 lesions were found,which were usually located in the neck and body of the pancreas,the diameter of 28 pancreatic lesions was ranging from 0.5 cm to 11 cm,with a mean diameter of 2.3 cm.On CT plain scan,there were 19 hypodense lesions,7 slightly hyperdense lesions and 2 isodense lesions,5 necrotic lesions.On enhanced CT,the lesions showed moderate enhancement in 7 cases,circular enhancement in 6 cases,moderate and circular enhancement in 6 lesions,obvious enhancement in 8 lesions and no enhancement in 1 lesion.All patients had extra-pancreatic metastases,and 2 cases had peripheral vascular invasion.Conclusions Pancreatic metastases are rare,often accompanied with multiple lesions and extra-pancreatic metastases.The CT features of pancreatic metastases from renal carcinomas are slightly hyperdense and obvious enhancement; in other metastases,there are hypodense,morderate and/or circular enhancement lesions.Accurate diagnosis can be achieved by knowledge of patients' medical history.

Picture archiving and communication system ( PACS ) based on digital teaching platform of medical imaging consists of web teaching system and teaching resource library of medical imaging.The web teaching system includes four function modules of classroom management,work management,teaching management and test management.The teaching resource library includes script,pictures,and audio,video and animation materials of theoretical books,typical cases,examination techniques and medical imaging equipments.Utilized in theoretical and practical classes,the teaching characteristic of medical imaging is made prominent,and the subjective motility of the students is brought into play.

Objective To summarize the imaging features of neurofibromatosis.Methods Imaging data of 7 patients with neurofibromatosis proven by operation and clinical syndrome,were retrospectively analyzed.Results In 7 cases of neurofibromatosis,the findings of CT and MRI displayed 3 cases of bilateral vestibular schwannoma,2 of which were combined with optical nerve glioma;1 case of optical nerve glioma complicated with neurofibromatosis under cervical dura;1 case of meningioma and 2 cases with the changes of dura spinal sac.The last two cases displayed abnormal skull and spinal canal,concave change of vertebra and enlarged dura spinal sac,partially stretched to never root on CT plain flim and MRI.Conclusion Neurofibromatosis can be definitely diagnosed by optimal imaging examination based on comprehensive analysis of imaging features and typical syndromes.

Objective To study the correlation of CT perfusion imaging ( CTPI) of induced rat breast cancer with tumor pathological grade and microvascular density ( MVD) ,and the diagnostic value of CTPI for breast cancer. Methods Breast cancer was induced in 35 Wister male rats with intragastric 7,12-dimethyl-1,2-benzanthracene ( DMBA) treatment. Routine breast CT scanning and CTPI were performed. After processed at a workstation,CTPI parameters were obtained including blood flow ( BF) ,blood volume ( BV) ,mean transit time ( MTT) ,permeability surface ( PS) ,and time density curve ( TDC). The rats were sacrificed and breast tumor tisue samples were collected. Breast tumor tisue samples were stained with HE and factor Ⅷ-related antigen immunohistochemistry to observe the pathological type and MVD of tumor. Results Breast tumor was successfully induced in 30 rats ( including 8 with breast hyperplasia and 22 with breast cancer). The BF and BV were higher in rats with breast cancer than in those with breast hyperplasia 151. 72 ? 93. 43 vs 42. 96 ? 32. 42 ml/( min.100 g) ,9. 55 ? 7. 88 vs 2. 17 ? 1. 36 ml/100 g,P 0. 05). The positive correlation of MVD with BF,BV and PS was increased with the decreased tumor differentiation with a correlation coefficient of 0. 701,0. 441 and 0. 521,respectively ( P

Objective To analyze CT features of retroperitoneal tumors or tumor-like lesion and to evaluate CT in localizating and qualitative diagnosis of diseases.Methods CT findings in 45 cases with pathologically-proved retroperitoneal tumor were retrospectively analyzed and compared with pathological results.Results There were 25 cases of benign tumors and 20 cases of malignant tumors.The CT features of benign tumors were homogeneous density,smooth peripheria with clear border,while mixed density,large and irregular in malignant tumors.The accuracy of localizating lesions was 89%,the accuracy of qualitative diagnosis was 78%,the accuracy of histologic evaluation was 49%.Conclusion CT imaging is valuable in diagnosing retroperitoneal tumors.CT can make accurate localization of tumors and identify the nature of tumors,but is limited in evaluating histologic types.