CT理论与应用研究

The Test Method of Concrete Elements Integrity Using Seismic Image Profiling

DAN Na-lin, ZHU De-bing, HUANG Xi-liu

2002, 11(2): 1-4.

Abstract(1523) PDF(0)

Abstract:
Cavity and honeycomb may form in the construction of concrete elements such us the column base and ground base beam of a high building. Seismic image profiling method(common offset profiling) is used to verify the integrity of the concrete construction elements. By model experiments, the anomalous characteristics of cracks and cavities on seismic image profiling are obtained, and the influences of offset and other survey parameters on the seismic image profiling are studied. The model experiments and practical application show that by careful selection of seismic source and survey parameters, the seismic image profiling method can used effectively to verify of the integrity of concrete construction elements.

The Application of 3-D High Resolution Seismic Exploration Technology in Well 2 of Mobei in Zhungaer Basin

HUANG Yong-ping, XIA Dai-xue

2002, 11(2): 5-8.

Abstract(1449) PDF(0)

Abstract:
By using the technology of medium frequency geophone, small CMP bin,high coverage,optimizing shot-receive line pattern,big refraction-dune curve method,dynamic static correction iteration and high resolution velocity analyses,high SNR(Signal-to-Noise Ratio) and high resolution 3-D seismic data has been gathered the first time at the massive desert of Zhungaer Basin. The travel time and frequency range found at the interest zone Jurassic system is 2.0~3.0s and 10~90Hz,main frequency is 50Hz. Through interpretation of the seismic data, another new 17 minor faults has been found(fault throw 10~20m).

Evaluation the Effect of Profile Controlling Reagent SCA-II Injection at High Temperature by NMRI in Liaohe Oil Field

SHANG Gen-hua, LIU En-hong, QIAN Zhan-feng

2002, 11(2): 9-11.

Abstract(1579) PDF(2)

Abstract:
This paper present a new method of evaluation the injection of profile controlling reagent by NMRI at 200℃ in Liaohe Oil Filed to elimination stream flow along the high permeability layer. With the modern digital NMR SPECTROSPIN 47/40 made in BRUKE Corporation, the reagent first flow along higher permeability layer in the middle of the sample. Then, following stream flood into lower permeability area to increase oil productivity. The velocity of stream flooding into the sample affected the effect by the injection of SCA-II. The higher of velocity of stream flooding, the lager of the permeability rising by following stream. SCAII reagent can not only reduce the permeability in higher permeable area, but also increase oil productivity from lower permeable area.

Reconstructing High Resolution Image from Overlapped Low Resolution Projection Data

GUO Ming-huan, ZHANG Peng

2002, 11(2): 12-18.

Abstract(592) PDF(0)

Abstract:
The authors present two novel algorithms of reconstructing high resolution image from overlapped parallel projection data with low resolution. One is called virtual detector algorithm, and the other is direct reconstruction algorithm. Both of the algorithms are developed from the interpolative algebraic reconstruction technique (IART) contributed by E.J. Mazur and R. Gordon. The main assumption in the paper is that the linear array of detectors can shift along the line of the array with a step which is less than the width of the detectors, and the overlapped projection data can be collected by overlapped sampling. The simulation results show that high resolution images can be reconstructed by means of both algorithms from the overlapped projection data. Moreover, the quality of the image reconstructed by the virtual detector algorithm from the overlapped low resolution projection data is almost as good as that of the image reconstructed directly from the high projection data. Although the resolution of the image reconstructed by direct reconstruction algorithm is slight lower than that of the image reconstructed by the virtual detector algorithm, the direct reconstruction algorithm adapts to any kind of overlapped projection data.

Technique Research of Inspecting The Light Substance Covered by Heavy Substance Through The Transmission Image

SHAO Li-kang, HAN Yu-sheng, LUO Ya, DING Hou-ben, SHEN Jian-hua, XU Ming-zhong

2002, 11(2): 19-21.

Abstract(626) PDF(1)

Abstract:
The paper probes into the gray relation of the transmission CT image of the substance of various thickness. We find out the curve of minimal thickness that can exam the light substance covered by the heavy substance of various thickness in accordance with the request of picking out the profile.

CT Manifestations and Differential diagnosis of Splenic Tumour

XU Chun-lin, LIU Wei, ZHANG Wen-hua, PENG Lei

2002, 11(2): 22-24.

Abstract(786) PDF(0)

Abstract:
Objective To study CT manifestations of splenic tumour and to evaluate CT in their diagnosis. Materials and Methods Plain and enhanced CT scaning were performed in 22 patients with pathologically proved splenic were performed in 22 patients with pathologically proved splenic tumour, which included hemangioma (n=3), lymphangioma (n=1), hamartoma (n=1), splenic involvement due to maligmant lymphoma (n=4), splenic metastases (n=4). Results : CT scan could easily detect splenic tumours, and colud well demonstrate the size, shape, density of the lesion and the surrounding structures as well. Conclusion : CT is a preferred imaging examination for this disease. CT is very helpful for the diagnosis of splenic tumour.

Differential Diagnosis of CT between Gallbladder Carcinoma of Thick Wall and Chronic Cholecystitis

XU Zhao-tu

2002, 11(2): 25-27.

Abstract(991) PDF(1)

Abstract:
Objective To discuss differential diagnosis between gallbladder carcinoma of thick wall and chronic ccholecystitis. Methods Gallbladder carcinoma of thick wall in 15 cases and chronic cholecystitis in 15 cases proved by pathology were analysed by comparison. Results: Gallbladder wall in all cases with gallbladder carcinoma was irregular thickened. It's wall of in 6 cases were interruption after enhancement. It's caverna in 8 cases were small and normal shape were lost, It's wall in 9 cases were stiff. It's round in 10 cases were not clear, Lymph node in 7 cases were big. 15 cases chronic cholecystitis: Gallbladder wall in 2 cases were irregular thicken, gallbladder were changed small and it's wall were stiff in 2 cases. It's round in 4 cases were not clear. All one's Lymph node were not big. Conclusion: Differential diagnosis of CT have important value between gallbladder carcinoma of thick wall and chronic cholecystitis.

The Application of Multi-slice Spiral CT in the Maxillofacial Trauma

LI Jiang-shan, LI Shao-dong, RONG Yu-tao, CHENG Guang-jun, XU Kai

2002, 11(2): 28-31.

Abstract(659) PDF(0)

Abstract:
Objective To evaluate the application of Multi-slice Spiral CT(MSCT) in the Maxillofacial Trauma. Materials and Methods 20 case with maxillofacial trauma were scanned by MSCT, all images were performed with Shaded surface display(SSD), Volume rendering(VR) and Multi-plane reconstruction(MPR). Results SSD and VR can display the obvious craniofacial fractures clearly and stereoscopically. MPR can display the craniofacial fractures wholly and accurately, especially the tiny fracture in the deep. Conclusions MSCT with reconstruction can display the cranio-facial fractures wholly, accurately and stereoscopically,and plays an important role in both diagnosis and clinical managements.

The Application of CT and X-ray Examination on Traumatic Osteoporosis

HUANG Kai-yin

2002, 11(2): 32-35.

Abstract(620) PDF(1)

Abstract:
Purpose: Analyze the application of CT and X-ray in examining traumatic osteoporosis. Result: There are 113 traumatic patients with osteoporosis after 2~3 months,66 patients have osteoporosis after 3~4 months. 21 cases haven't osteoporosis. Conclusion: We should reduce the WW and WL when the patient who had fracture before reexamine again.

CT Different Diagnosis of Renal Tumor

YAO De-hui

2002, 11(2): 36-38.

Abstract(876) PDF(0)

Abstract:
Purpose: To investigate CT differential diagnosis of renal tumor. Materials and Methods: CT manifestations of renal tumor were. analysed in 27 patients, Results: renal carcinoma 9 cases. Angio-myolipoma 7 cases, malignant lymphoma 1 case. Angiomyolipoma 7 cases, malignant lymphoma 1 case. Angiomyolipoma malignant change. 1 case, renal pelvic carcinoma 1 case calyces renal carcinoma 2 cases, renal oncocytoma 2 cases, nephroblastoma 3 cases, renal malignant enterier hemangioma 1 case. Conclusion: There are characteristic CT manifestations in every renal tumor. The CT scaning can different diagnosis to the greater part of renal tumors.

CT Findings of Cervical Spine Disk Pathological Changes and It's Clinical Significance

HUANG Shao-quan, XIANG Nian-hu

2002, 11(2): 39-41.

Abstract(613) PDF(0)

Abstract:
Objective To evaluate the CT diagnosis of cervical spine disc pathological changes and it's clinic value. Materials and Methods study the CT images of 80 cases cervical spine disc pathological change with cervical spine disk pathological changes to lead to happen; bulked yarn and emerge is singularly, mostly is pop out; single vital link is singularly and briery is multiangular; C5/6,C4/5and C6/7 pathological changes is multiangular;the degree of pop out is between 2mm and 5mm. Conclusion CT scanning can display the vital link and type of cervical spine disk pathological changes, also can photocopy gist for clinical cure. spinal cord and nerve root and offer photocopy gist for clinical cure.

Diagnostic Value of Annular Enhancement Sign on Enhanced CT Scan in Tuberculoma

GUO Yi-hua

2002, 11(2): 42-44.

Abstract(590) PDF(0)

Abstract:
Objective To evaluate the diagnostic value of annular enhancement sign on enhanced CT scans in tuberculoma. Methods The patients pathologically and clinically confirmed including pulmonary tuberculoma(n=21)and pulmonary carcinoma(n=13)and inflammatory nodules(n=8) were studied with plain chest CT scanning and enhanced scanning to observe the enhancement degree and pattern. Part of above including pulmonary tuberculoma(n=8)and pulmonary carcinoma(n=13)and inflammatory nodules(n=4)were reselected to examine pathologically the degree and pattern of vascularity. The image and pathology were contrasted. Results :The annular enhancement sign was based on cheesy necrosis inside the tuberculoma and the granuloma with great vascularity under the circled membrane, and was merely observed in tuberculoma. Conclusion The annular enhancement sign on enhanced CT scans is one characteristic of pulmonary tuberculoma,and is of high value in the diagnosis of pulmonary tuberculoma.

CT and CR Image Analysis of Cervical Disc Bulging and Cervical Disc Herniation

SUN Lu, YAN Gang-wang, HUI Zhi

2002, 11(2): 45-47.

Abstract(505) PDF(0)

Abstract:
Purpose: Though analyze the exam of CT and CR, improving the differentiated ability from cervical disc buldging and cervical disc herniation. Materials and Methods: 100 patients examine CT and CR, several of them examine CTM. Results: Because the intervertebral space of C is less than T and the number of CT scanning is limited,so the cervical intervertebral disc can not show completely, but the CR photography is not only a simple method but also a valuable method. Conclusion: Analyze the method of CT and CR finding the strongpoint and shortcoming, get the correct diagnose combine with the clinical symptom and the medical history.

Analysis of Safety Measure of Using Pressure Injector During Enhanced CT & MR Scanning

GAO Wen-jie, DOU Xiu-mei, MU Jin-wei, LI Xia

2002, 11(2): 48-49,47.

Abstract(521) PDF(0)

Abstract:
We analysed retrospectively the cases who occur contrast leakage from blood vessels for using pressure injector during enhanced CT and MR scan from January to November, 2001. Because there are relative great pressure, high speed with high pressure injector, so it is easy to result in contrast leakage from blood vessels when injecting. It is preventive through standard operation, chose right puncture position, the gauge of injector needle and so on.

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2002 Vol. 11, No. 2