CT理论与应用研究

Ji Yongxing, Zu Donglin, Bao Shanglian

2000, 9(3): 1-8.

Abstract(2084) PDF(5)

Abstract:
Both CT and MRI are the most widely used clinical imaging facilities nowadays. This article is invited to give a significant and valuable comparison between CT and MRI in many aspects, such as imaging principles, performances, demand, features, parameters, sensibilities, securities, nature of signals, signals standards, theories of reconstruction methods, etc. It also traces back to the history resemblance of these two methods, and expounds that the sole development of these two mathematical methods (Radon Transform & Fourier Transform) roots in the distinct difference between CT and MR signals. Signal of MR is in time domain and signal of X-ray is in space domain. It is also pointed out that the mathematical foundation of PET, SPECT, OCT, UCT are of the same clan, except the MRI.

CT Features of Cardiac Carcinoma and Its Diagnostic Values

Wang Caixia, Chen Jing, Li Hong Wei, Xin DeHong, Deng Yong, Jiang Hu

2000, 9(3): 9-11.

Abstract(731) PDF(2)

Abstract:
To analyze two-phase dynamic CT features of 38 cases with cardiac carcinoma and to assess its usefulness for tumor detection and stages compared with surgical and pathologic findings. The detectablity of two-phase enhanced CT scanning for early and advanced cardiac carcinoma was 80% and 93.3% respectively. The accuracy of TNM stages and predicted surgery was 81.6% and 89.7% respectively. The manifestation of cardiac carcinoma included local or extensive thickening of gastric wall shown moderate or marked heterogeneous enhancement in the first phase (early enhancing phase). However, they shown homogeneous enhancement in the second phase. The results suggest that enhanced dynamic CT scan plays significant role in the diagnosis of cardiac carcinoma. the early enhancing phase scan demonstrates the tumor lesions. and it offers helpful information for selecting the method of therapy.

A Computer CT MRI Images Analysis and Diagnosis System for Cerebrovascular Disease

Li Jianding, Zhang Wenai, Chen Yongxin, Chen Yingli, Zhang Yaozhen

2000, 9(3): 12-14.

Abstract(745) PDF(2)

Abstract:
Purpose To build a computer aide d analysis and diagnosis system and using this system to help doctors quickly diagnose a Cerebrovascular disease it also can be used as a education system. Materials and methods Images and expert radial doctors are from the CT department of the First Hospital of Shan'Xi Medical University and and others,etc. A Visual Fox pro 3.0 program based on Win 3.2 perform the sequential diagnosis method Results the system can diagnose 23 kinds of Cerebrovascular disease from 29 CT characters and 23 MRI characters. The result replete can be printed. It has developed a Archive of Cerebrovascular diseases, concluding images and words. Conclusion it is proved that the CAAD system is a good aided diagnosis system and a good education system.

Image of Gallbladder in Differentiation of Ascites

Zhang Wei, Yuan Lingjin

2000, 9(3): 15-16.

Abstract(819) PDF(2)

Abstract:
Objective: To investigate the value of CT and ultrasound used in observing the form of the wall of gallbladder in diagnosis of ascites. Methods:The form of the Wall of gallbladder of 60 cases with ascites were analysed. It was found that the form of the wall of gallbladder was associated with the characterization of ascites. Conculusion: CT and ultrasound used in observing the form of the wall of gallbladder are helpful in differentiation of the characterization of ascites and looking for the cause of ascites.

CT Diagnosis of Delayed Traumatic Intracranial Hematoma

Zhao Xiangsheng, Gao Fakui

2000, 9(3): 17-19.

Abstract(738) PDF(2)

Abstract:
Objective: To study CT precancerosis and the value of follow-up CT scan for promptly disclosing delayed intracranial hematoma due to trauma. Methods: Follow-up CT scan was Performed in 120 patient with head injury. Results: On re-examination CT scan. 32 delayed intracranial hematoma were discovered. Among them, extradural hematoma was found in 16 cases. subdural hematoma in 12 cases and inttacerebral hematoma in 4 cases. About 80% of delayed hematomas occur within 3 days after trauma.Conclusion:Most of Delayed intracranial hematomas can be demonstrated on CT scan within 3 days after trauma. It is suggested that although the initial CT scan was normal, an immediate repetition of CT examination is indicated whenever patients show deterioration of cliaical symptoms and signs.

Prevention and Management of Side-effect of Contrast Media in CT Enhancemant Scan

Li Ronghuan, Li Jinzhi, Li Xinhua, Zhang Haining, Cui Wenguo

2000, 9(3): 20-22.

Abstract(795) PDF(2)

Abstract:
Purpose: To discuss the basic principle and management methods of decreasing the side-effect of contrast media in CT enhancement scan. Materials and methods: To select two different types contrast and give preventive medicine. eg.Dexamethasone. in 1800 cases CT enhancement scan. To sort, summary and sum-up tile side-effect of contrast media and bring forward concretely management. Result: General rate of side-effect of application ionic-contrast is 5.04%; Generant rate of side-effect of application non-ionic-contrast is 0.9%. Conclusion: It can obviously dicrease side-effect arte and fatal rate of contrast media by resoluble selecting contrast. strictly choosing high risk people. giving preventive medicine and possessing self-contained salvage methods.

The Analysis of CT and Clinical Data of External Hydrocephalus

Gui Chengli, Luan Kedong, Mo Yajun

2000, 9(3): 23-25.

Abstract(758) PDF(2)

Abstract:
Objective: To make a further study of the reality ship between CT and clinical data of external hydrocephalus (EH). Materials and Methods: For this study. 24 cases with CT data were collected, Grandiose cerebral CT scanning and clinical examination were performed in 10 cases. Results: The CT feature was as follows: enlarged subbrachial space, enlarged cistern of longitudinal fissure of cerebrum. most of these cases complied with enlarged cistern ambient. The results of followed examination was as follow: typical changes of EH appeared at 3 th months. recovery began form 6-12th months completely recovery before 24 months. while the clinical symptoms disappeared. Conclusion: EH is a self-limited entity in early baby. most cases restore to normal condition.

CT Diagnosis of Cavitary Pulmonary Tuberculosis

Cheng Guangjun, Xu Kai, Ren Zhongqing, Rong Yutao

2000, 9(3): 26-30.

Abstract(788) PDF(3)

Abstract:
Purpose: To study CT features of the cavitary pulmonary tuberculosis and assess the value of CT diagnosis. Materials and methods: CT and plain films were performed in 21 cases with cavitary pulmonary tuberculosis confirmed by pathology or clinic. The CT findings were compared with pathologic and plain film findings. Results: (1) Cavity of pulmonary tuberculosis predominantly involved apical and posterior segments of upper lobes. superior segments of lower lobes. (2) The cavity appeared as round or ellipse. The out wall usually was smooth. The calcification on the cavitary wall was often found. (3) Thickening of the involved bronchial wall were showed. (4) Adjacent pleural thickness were demonstrated. (5) Endobrochial spread manifestation and active lung parenchymal TB were showed outside cavity. 48% of cases had typical CT features and could make a correct diagnosis. In 29%. CT appearances were atypical but suggestive of the diagnosis. In 23%. the correct diagnosis was difficulty to be made by CT. Conclusion: CT is an effective method in diagnosis of pulmonary tuberculosis. The diagnostic accuracy can be improved for atypical CT findings in combining with bronchoscopy. and sputum examination.

Three-dimensional electron beam CT reconstruction image and Cranio-Maxillo-Facial Surgery

Gui Lai, Luo Maoping, Dai Ruping, He Sha, Teng Li, Zhang Zhiyong, Huang Lu:Ping

2000, 9(3): 31-34.

Abstract(662) PDF(3)

Abstract:
Successful execution of a surgical treatment necessitates knowledge of the relevant anatomy. physiology. and pathology. as well as the technical specifics of the operation. At this time. the Cranio-maxillo-facial three-dimensional reconstruction can display bone change and relationship with adjacent structure, which is very useful for clinical assistance examination and more favorable and more accurate for establishing surgical operation planning.

X-Ray Computed Micro-tomography(CMT) and Its Application to Petroleum Research

Li Yubin, Li Xiangliang, Zhang Kuixiang, Cao Xulong

2000, 9(3): 35-40.

Abstract(745) PDF(2)

Abstract:
The image resolution of industrial X-ray computed microtomography (CMT)with focal spot of X-ray source less than 5 micrometer is quite better than that of conventional focal spot CT.In petroleum exploration and development research computed microtomgraphy was used to many technological areas with revolutionary achievements: (1) determination of the basic petrophysical properties of cores - calculating and illustrating distribution of buck density, porosity and fluid saturation; (2) imaging of micro- scopic porous ofrock- intuitive describing micro-structure of porous and oil-water distribution in porous; (3) evaluatian of special lithological reservoir cores- investigating characteristics of cabonatite mogatic rock etc., that can not be done by conventional methods, (4) analysis of core flooding and enhanced oil recov- reconstructing macroscopical distribution of oil and water in cores, (5) application of other aspects: screening core, evaluation offormation damage, evaluating rock mechanical properties of cores, and so on.

Application of Ground Penetrating Radar in Three Gorges Project

Li Zhangming

2000, 9(3): 41-46.

Abstract(640) PDF(2)

Abstract:
During the Three Gorges Projct，many complicated engineering and geological problens are met,high-resolution harmless detecting method is needed to find bured geological defect or engineering quality problems,to guarantee the project schedule and engineering quality. Georadar is applied in detecting the extension of inhomogeneous weatheriag of granite, mapping the extension and geomery of large faults and weathering alternative layers, checking the enginecring quality of expresses. 3 case histories are introduced.The detecting results are consistent to the real situations. The application effects are obvious.

Diagnosing Value of CT in Occult Fracture

Wang Xianquan, Li Xinhua, Liu Ying

2000, 9(3): 48-51.

Abstract(562) PDF(2)

Abstract:
Objective: To explore the diagnosing value of CT in occult fracture. Methods: 84 patients with occult fracture were respectively analyzed. They were 64 male cases and 20 female cases. ranging from 7 to 73 in age. with an average of 42.6 years. All of the patients were scanned by CT in axial or coronal position. Results: Spinal fractures were found in 28. hip fractures in 8, tibia plateau fractures in 11. orbit fractures in 12. temporal bone fractures in 13. and scapula fractures in 12 cases. Conclusion; CT has significant value in diagnosing occult fracture. Once fracture is suspected clinically. and yet negative plain radiography is encountered, CT scanning is recommended.

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2000 Vol. 9, No. 3