CT理论与应用研究

Application of Resistivity Tomography Survey Method to Detect Active Faults in Urban Area

LI Qing-lin, ZHANG Jian-zhi, QIN Jian-zeng, HUANG Bang-wu

2003, 12(1): 1-5.

Abstract(1503) PDF(0)

Abstract:
Objective Application of Resistivity Tomography Survey Method to Detect Active Faults in Urban Area. Materials and Method The resistivity tomography survey method is used for detection of active earthquake faults at Olympic Games Village in Beijing active faults, Laoyachen faults in Zhenzhou and south Anyang fracture. Result The forward and inverse software are used the ideal results are obtained. Conclusion Show that the resistivity tomography survey method is very effective for detection of active earthquake faults in urban area.

Visualization of 3-D Seismic Data in Virtual Reality

ZHANG Er-hua, MA Ren-an, ZHAO Chun-xia, YANG Jing-yu

2003, 12(1): 6-12.

Abstract(1515) PDF(0)

Abstract:
Purpose : To analyses the 3-D seismic data with visualization, and see the geologic phenomenon and regularity directly hidden in the data. Methods : Using a particle model to show a reflection wavelet, all the particles from the same bed will coincide to a reflection surface. In order to improve display velocity, transform the seismic data to a 3-D two-valued image, trace the 3-D connected zone with ordered cross algorithm, thin the zone to get the coordinate of the reflection surface. Observe directly the stratigraphic structure by drawing the stereoscopic image of reflection surfaces in virtual reality system. Results : The 3-D shape of reflection surfaces and the extension of the faults is observed by fact experiment. The stereoscopic image can reveal more profoundly the complex geologic phenomenon. Conclusion : The method is efficient. Only visualization in virtual reality can directly observe the underground scene, and may realize 3-D interpretation of 3-D seismic data really.

The Discussion of 3D Approximate Image with Fps method of Quantitative Interpretation

QIANG Jian-ke, RUAN Bai-yao

2003, 12(1): 13-16.

Abstract(2306) PDF(6)

Abstract:
Purpose :In the past, the characters of the original curve were used to process and interpret the IP sounding data. Method : This paper presents a kind of FPS method about 3D approximate image to locate the anomaly position. Results :The method could determine the anomaly boundary lines around it and show the stretch along anomaly direction. Through model test, the result is well. Conclusion :So we recommend to apply it.

Correction Study of S Equivalence to Sounding Curves in Embankment Exploration

XU Shun-fang, LI Zhen-yu, LI Jin-zhan

2003, 12(1): 17-20.

Abstract(1542) PDF(0)

Abstract:
Purpose This paper discusses the middle layer S equivalence existing in electric sounding curves for soil embankment investigation. Method Electric sounding in embankment exploration has advantages of low cost, practical and efficient. Results Analyses the effect of S equivalence on detecting accuracy in assessment of embankment quality through the actual cases,. Conclusion Finally proposes a new correction method under well constraint conditions.

CT Application value on Conformable Radiotherapy of Somatic Tumor

SHI Yan

2003, 12(1): 21-23.

Abstract(1421) PDF(0)

Abstract:
Purpose : To study the CT application value on conformable radiotherapy. Material and Methods : 47 tumor patients were cured with conformable radiotherapy. Their CT images before therapy were compared and analyzed with the CT images after therapy. Results : CT can define the size, position, adjoining relation and orientation marking of tumor before clinic therapy. After radiotherapy, CT can display the change of tumor size, location and the complication's degree. Conclusion : CT examination has very important application value on tumor location, therapeutic evaluation and complication evaluation in conformable radiotherapy.

Computerized Tomography for Diagnosis of Breast Cancer

CHEN Yi-hui, HUANG Fu-qi, CHEN Qin

2003, 12(1): 24-26.

Abstract(1490) PDF(0)

Abstract:
Objective To discuss technique of computerized tomography (CT) scan in diagnosis of breast cancer and to investigate image characteristics of breast cancer in CT scan. Methods CT scan and reinforcement scan documents from 23 cases of breast cancer were reviewed. The diagnosis of all these 23 cases were confirmed with pathology of excised mass. Results CT scan was able to show the anatomical structure of breast clearly and find tumor with higher sensitivity. CT scan and reinforcement scan were also able to measure the size of tumor and to find out any change near tumor. Conclusions CT scan and reinforcement scan are ideal techniques for breast cancer either in diagnosis and differential diagnosis or clinical TNM staging and treatment decision.

Significance on Diagnosing Fatty Liver of Limitation by CT

SUN Li-xin, WANG Li, WANG Hong-tao, MA Hui, YUAN Ling-jin

2003, 12(1): 27-29.

Abstract(2058) PDF(3)

Abstract:
Objective : To study the fatty liver of limitation of the location, shape, density and the differential diagnosis methods. Methods : 40 cases fatty liver of limitation were riddled and the plain and enhanced CT was performed. To diagnosis using CT number and the criteria of relative density of hepatic vessels and postcontrast display. Results : In 40 cases, 29 cases were distributed by the segment of liver(72.2%),10 cases were distributed by the leaf of liver (22.2%), 1 cases was spherical (2.2%). All of the cases were appearance of hepatic vessels immersion. 10 cases were appearance of reverse hepatic vessels. The density was risen of light and the vessels was clear. Conclusion : Using CT number, the criteria of relative density of hepatic vessels and the relative density is of great value in the diagnosis of the fatty liver of limitation.

Clinical Value on Diagnosing Hypoxic Ischemic Encephalopathy in Neonate by CT

SUN Li-xin, WANG Li, WANG Hong-tao, MA Hui, HU Jun, YUAN Ling-jin

2003, 12(1): 30-32.

Abstract(1420) PDF(1)

Abstract:
Objective To study the clinical value of CT diagnosis hypoxic ischemic encephalopathy (HIE) in neonate. Methods Ct scan 46 cases of HIE, to observe the density of brain and the system of liquor cerebrospinalis changing. Results All of the density of the substantia alba is low (100%), and a part of attend by hemorrhage in the cavital of the arachnoidea mater encephali. The correctly of CT diagnosing is 97.6%(1/46). Conclusion CT diagnosing HIE is value, but should be unite clinical. It is very value in prognosis to diagnosis of early.

Computed Tomography of Vertebral Tuberculosis

LI Peng, YANG Wei, ZHONG Qing-jun

2003, 12(1): 33-35.

Abstract(1347) PDF(1)

Abstract:
Objective Computed tomography of Vertebral Tuberculosis. Material and method : Is about tuberculosis of spine confimed by operation and clinical data in 52 cases. Result : Its main CT appearances are described. Conclusion: Its type of bony destruction and its value of diagnosis are discussed and analyzed in the paper.

Clinic Value of contrast-enhanced CT in Skull and Brain

LU Xia, HU Bing

2003, 12(1): 36-38.

Abstract(2205) PDF(2)

Abstract:
Objective : To evaluate the clinic value of contrast-enhanced CT. Materials and methods : 48 cases are examined with contrast-enhanced CT. There images of CT are analyzed retrospectively. Results : accordant enhanced 8 cases; enhanced ring 9 cases; enhanced dots 7 cases; enhanced spots 12 cases; abnormal enhanced 7 cases; no enhanced 5 cases. Meninges and Tentorium cerebella are enhanced, its anatomic structure is clear 38 cases. Conclusion : Contrast-enhanced CT can improve density resolution of the diseases. It is helpful to confirm the position and the character of the diseases.

Comparison and Research on Methodology and Technology between Medical Nuclear Magnetic Resonance Tomography (MNMRT) and Surface Nuclear Magnetic Resonance Detection of Groundwater (SNMRD)

LI Jun-li, LI Zhen-yu, LI Jin-zhan, PAN Yu-ling

2003, 12(1): 39-42.

Abstract(1466) PDF(0)

Abstract:
Objective :Medical Nuclear Magnetic Resonance Tomography (MNMRT) and Surface Nuclear Magnetic Resonance Detection of groundwater (SNMRD) are different areas of NMR technology applications. Methods : In this paper comparison and research on the methodology principles, technology and application between them are made, and suggestions for detection of groundwater with NMR technology are proposed.

Three Dimension Computerized Tomography Configuration of Lung Nodus:Its Clinical Application

HUANG Fu-qi, CHEN Qin, CHEN Yi-hui

2003, 12(1): 43-46.

Abstract(2069) PDF(4)

Abstract:
Objective : To evaluate the clinical application of three dimension configuration in lung nodus. Material and Methods : Using helical computerized tomography (CT) scan with layer distance/disance between spires/configuration interval as 10mm/10mm/10mm and Fov 300mm-360mm。We made three dimension configuration on 53 cases of lung nodus which were found in routine CT scan and 100 controls in whom no nodus was found in routine CT scan. We defined-720 HU as lower limit of configuration (volume rendering) and compared the result with routing CT scan. Results : Among 53 positive cases, single nodus was found in 47 cases, with 21 in left lung and 26 in right lung. The diameter ranged from 0.5cm to 3.0cm. Rugged edge and vascular figure were clearer in helical than in routine scan. Double noduses were found in 2 cases and all proved to be benign later, with one as tuberculosis and the other as nonspecific infection. Multiple noduses of both lungs were found in 4, with 3 as carcinomatous metastasis and 1 as tuberculosis. Among 100 controls in whom no nodus was found in routine CT scan, a nodus (0.5cm) was found in 92 cases to have health examination and 2 was found in 8 cases with cancer (6 with esophagus cancer and 2 with lung cancer). Conclusions : Three dimension configuration of helical CT scan increased the sensitivity and showed clearer nodular edge feature. It contributes to reliable diagnosis of lung nodus and might be recommendable to clinical application.

Positron Emission Tomography and PET Image Reconstruction

LIU Li, WU Xiao-feng, YIN Yin

2003, 12(1): 47-50.

Abstract(1761) PDF(5)

Abstract:
The principle of PET (Positron Emission Tomography) and its image reconstruction methods are briefly reviewed, with emphasis on the FBP (Filtered Back-Projection) method and the OSEM (Ordered Subset Expectation Maximization) both are often used in modern PET. By PET clinical protocol, some parameters can be suitably chosen in order to obtain better reconstructed images. The 3D PET rebinning algorithms are also introduced.

Review on POCS Algorithms for Image Reconstruction

Ming JIANG, Zao-tian ZHANG

2003, 12(1): 51-55.

Abstract(1557) PDF(2)

Abstract:
Purpose : A brief review on recent advances in POCS algorithms for image reconstruction with a preference towards practical applications and relevant convergence results in various formulations and topologies for the consistent and inconsistent cases. Mathematical details are minimized for a wide readership. Method : POCS based iterative algorithms. Result : Various recent results and applications are presented. Conclusion : The powerful algorithmic formulation of the POCS scheme will find various important applications in image reconstruction

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2003 Vol. 12, No. 1