CT理论与应用研究

The Correction of Motion Artifact with fMRI Using Image Registration

Zu Donglin, He Qiang, Luo Qingfei, Jin Zhen, Bao Shanglian

2001, 10(4): 1-3.

Abstract(751) PDF(2)

Abstract:
We consider human head as a rigid body, so the six parameters(3 of translation, 3 of rotation) that describe rigid body transformation can be applied to image registration. At first, the six parameters are given an initial value respectively. Then, they are optimized iteratively. The most optimized parameters are determined when we get the sum of squared differences between source image(the image to be registered) and reference image. After the acusector sting fMRI images are processed by 3D registration, most motion artifact can be eliminated, and the effect is satisfied.

Research and Comparison on Several CT Reconstruction Algorithms

Zhang Peng, Zhang Zhaotian

2001, 10(4): 4-9.

Abstract(1417) PDF(5)

Abstract:
Filter back projection(FBP) algorithm, local reconstruction algorithm(Local RA) and modified algebraic reconstruction technique are researched. The experiments of imaging reconstruction are made to these algorithms by using designed simulation data and real XCT data respectively. Analysis and comparison of these algorithms on reconstruction speed, spatial resolution, density resolution, as well as the advantages and disadvantages are given.

The Cross-well Seismic Computerized Tomography Technology and It's Application in The Cavern Survey

Sun Yuejun, Yu Guozhu, Shi Gui, Liu Wenxiang

2001, 10(4): 10-13.

Abstract(912) PDF(2)

Abstract:
:The existence of cavern would bring great or potential dangers to every kind of construction engineering. Cross-well seismic computerized tomography(seismic CT) technology is a new geophysics method. This method can efficiently and accurately inverse the inhomogeneous distribution of layers between the wells. This theme is about the principles and methods of cross-well seismic CT technology, and it introduces the application of this technology in a factual cavern survey engineering. In the engineering, the authors combine the result of drilling survey and inversion result of seismic CT technology, and then analyze the two comparative results. As the analysis shows, the seismic CT technology have the advantages of higher precision and credibility, which can make preciser imaging of subsurface medium in engineering geophysics than usual explorative methods.

Applications of Industry CT in Porosity Analysis of Composite Material

Cao Yuling, Sun Lingxia

2001, 10(4): 14-17.

Abstract(942) PDF(1)

Abstract:
The method of analyzing the porosity of ceramic matrix composite with high resolution computed tomography(ICT) is introduced in this paper. Firstly the ceramic matrix composite with high resolution computed tomography(ICT) is introduced in this paper. Firstly the ceramic matrix composite parts were scanned in the high resolution BT-50 ICT system imported from INDINTR Co. Ltd in Russian. The CT image was analyzed by the post-processing software and the porosity was obtained. The results were consistent with the results obtained by the ultrasonic testing method. So it is possible to evaluate the porosity of composite with the high resolution ICT system. And the ICT can be utilized for flaw detection and density analysis.

CBS Image Reconstruction BasedOn Filtered Backprojection

Huang Feng, Shao Likang, Ding Houben, Shen Jianhua, Shi Guochuan

2001, 10(4): 22-25.

Abstract(795) PDF(1)

Abstract:
The paper mainly introduces how to use Filtered Back-Projection Algorithm in CBS Image Reconstruction .The algorithm in CBS Image Reconstruction has showed some attractive features, such as fast speed high quality and easy to correct data.

Direct Reconstruction of CBS and Image Treatment

Yang Qiyu, Shao Likang, Ding Houben, Shen Jianhua, Shi Guochuan, Huang Feng

2001, 10(4): 26-30.

Abstract(703) PDF(2)

Abstract:
The theory of CBS picture's reconstruct is given in this paper. It list the technical problem of designed service and the resolvent of it here. It simply recommend this system and give the simulant result.

Applications of Microtek 9800xl Scanner at Medical Treatment Image Figure

Jiang Qiang

2001, 10(4): 18-21.

Abstract(901) PDF(2)

Abstract:
In this paper, a sort of aim for CT、X class light-film figure assistant facility was introduced,and the difference, between tradition facility and existent facility, and the importance of this facility in medical imaging system are prescribed. Herein after precept consider fully know clearly in existence film case cum document supervisor mode; invest dimensions;As adopt advanced electronic picture technique,not only braid experience immediacy,get agility,even digitalization rear image facilitate part observe cum digital measurement still facilitate pool and release full expedite 'medical digitization system construction' with better professional of image,facing world commerce medical treatment internationalization environment.

Malfunction Servicing of Philips T5-NT MRI Set

Liu Hong, Liu Ying

2001, 10(4): 31-32.

Abstract(667) PDF(1)

Abstract:
Half black screen was shown in Philips T5-NT MRI Scanner and with its message. This trouble was associated with environment temperature, checking machine and find the bad parts TC-420 board at the best power up time. The malfunction disappeared after this board was replaced.

CT scanning and Nursing for Cranio-cerebral Trauma and Its Technique Analysis

Huang Liling

2001, 10(4): 33-34.

Abstract(791) PDF(0)

Abstract:
Purpose:To analyze the technique of CT scanning and Nursing for Cranio-cerebral Trauma patients .Materials and Methods: Summarize for 9600 patients cases of pre-scanning and after X-CT scanning. Clarifying the influence about this disease on the correct diagnosis and therapeutic effects. There are 9-techniques have been summarized. Conclusion: X-CT scanning is the first selected method for correct diagnosis of cerebral trauma patients , it can be used to clarify the area of trauma, but also to show a important indicator for surgical operation judgment. It is important that the technique of CT scanning and Nursing for cerebral injury patients can pledge the CT examination done.

Preliminary Study of Diagnosing Carcinoma of Larynx Using High-frequency Ultrasound and Color Doppler Flow Imaging

Cai Jiaqiang, Cui Jianhua

2001, 10(4): 35-37.

Abstract(810) PDF(1)

Abstract:
Objective:To study the clinical value of using high frequence planar ultrasound and CDFI to diagnose carcinoma of larynx. Methods:We directly scan 10 cases of laryngeal tumour through cervix in order to observe the tumour's size ,sharp,limit and its inner echo. To observe the color bloodstream in the centure and side of the tumour by using CDFI. According to abundance of the tumour's blood supply.We can use the method of semi-quantitative analysis to grade it .Results: By high frequence planar ultrasound ,we can find 9 cases out of 10 cases of the laryngeal cancer, it display 90%(9/10).Most of the tumour's echo is asymmetric and low(8/9,89%).Display rate of the tumour's,blood flow signal is 100%(9/9),The abundance of the tumour's blood supply are mainly of grade Ⅱand grade Ⅲ. Conclusions: Examming through cervix, high frequence planar ultrasound can clearly display the normal structure of larynx,The discovery rate of the tumour is high .With CDFI to observe the tumour's blood flow signal ,it is of great value in diagnosis laryngeal cancer.

Functions of Multi-row Helical CT Using in Medical Diagnosis

Yan Gang

2001, 10(4): 38-41.

Abstract(584) PDF(0)

Abstract:
To introduce the principle of the most advanced helix CT and the different from the routine CT, introduce the progress of the clinic application.

The CT Image of Stomach Tumor

Zhang Juwu

2001, 10(4): 42-45.

Abstract(839) PDF(0)

Abstract:
Objective: Through summarize the CT image of stomach tumor and contrast with traditional means of gastrointestinal examination thereby to rise the knowledge about the CT image of stomach tumor. Methods: Through to make analysis of 32 CT images of stomach tumor of our hospital and refer to literatures about stomach tumor , summarized the CT image of stomach tumor .Result : The CT image of stomach tumor consist of :the mucous membrane are coarse and irregular ;the mass in the stomach ;niche and so on, and the result of the diagnostic accord with the result of the surgical operation .Conclusion: CT is one of the most important means of gastric examination and has great value in gastric disease .

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2001 Vol. 10, No. 4