CT理论与应用研究

Research on Light Substance Auto identifying algorithm Through the Radial Transmission Image

SHAO Li-kang, YI Su-jun, HAN Yu-sheng, QIN Xiao-yan, DING Hou-ben, SHEN Jian-hua, XU Xiao-ming

2003, 12(4): 1-4.

Abstract(915) PDF(1)

Abstract:
Objictive : The difficulty problems of auto identifying algorithm towards light substance through the radial transmission image are discussed in the paper. Method : An identifying algorithm based on contour and gray features is provided. Results and Conclusion : The paper describes the algorithm in detail with experiment result.

Algorithm of Real-time Image Correction for Multi-speed Security Verification System

HAN Yu-sheng, YI Su-jun, SHAO Li-kang, DING Hou-ben, LI Peng-hui, NIE Chao, QIN Xiao-yan

2003, 12(4): 5-9.

Abstract(827) PDF(2)

Abstract:
The difficulty problem of image deform in multi-speed security verification system is discussed in the paper, and a real-time correction algorithm is provided. The results of simulation show that the algorithm is reliable,suitable for real-time image correction for muilt-speed security verification system. The paper describes the algorithm in detail with experiment results.

Theory and Method of Spatial Encoding in MR Imaging

WANG Wei-dong, ZHANG Bi-da, CHEN Guang-fei, BAO Shang-lian

2003, 12(4): 10-16.

Abstract(868) PDF(0)

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Basic methods of MR imaging are systemic described in this paper. And localized Fourier transform and radio-frequency encoding methods is proposed. Meanwhile, these methods are completely reviewed, and their implementations are also discussed.

The Imaging Diagnosis of Severe Acute Respiratory Syndrome

SUN Yong-guang, LIU Da-tong

2003, 12(4): 17-21.

Abstract(846) PDF(0)

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Purpose : To retrospectively evaluate the radiographic appearances and pattern of progression of severe acute respiratory syndrome (SARS). Materials and methods : Chest radiographs obtained at clinical presentation and during treatment in 22 patients with confirmed SARS (8 men, 14 women; mean age, 39。9 years; age range, 14-73 years) were assessed. Radiographic appearances of pulmonary parenchymal abnormality, distribution, and extent of involvement on initial chest radiographs were documented. Recognizable patterns of radiographic progression were determined by comparing the overall mean percentage of lung involvement for each patient on serial radiographs. Results: Initial chest radiographs were abnormal in 19 of 22 patients and showed air-space opacity. Lower lung zone (15 of 22) were more commonly involved. In most patients, peripheral lung involvement was more common (15 of22). Unifocal involvement (19of 22) was more common than multifocal or bilateral involvement. No cavitation, lymphadenopathy, or pleural effusion was demonstrated. Initial focal air-space opacity in 14 of 22 patients progressed to unilateral multifocal or bilateral involvement during treatment. Conclusion : Predominant peripheral location; common progression pattern from unilateral focal air-space opacity to unilateral multifocal or bilateral involvement during treatment; and lack of cavitation, lymphadenopathy, and pleural effusion are the more distinctive radiographic findings of SARS.

Severe Acute Respiratory Syndrome: Radiographic and CT Findings

QI Rong-xiu, MA Jun, ZOU De-rong, YU Wu-jiang

2003, 12(4): 22-26.

Abstract(674) PDF(0)

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We review the radiographic and CT findings in the lungs of 14 patients with severe acute respiratory syndrome(SARS).The results indicated that the most common radiographics of SARS patients are unilateral or bilateral ground-grass opacities and focal unilateral or bilateral areas of consolidation. In hospitalized SARS patients, the abnormalities change rapidly.

Diagnosing and Analysing Spheral Tuberculosis of Pulmonary by HRCT

SUN Li-xin, WANG Li, ZHOU Xia, WANG Hong-tao, YUAN Ling-jin

2003, 12(4): 27-30.

Abstract(687) PDF(0)

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Objective To assess the features and the value of diagnosing of HRCT with Pulmonary Spheral Tuberculosis(PST) Methods The 24 foci in 21 patients with PST were analyzed. Thin-sections at 1.5cm to 3.0cm thickness through the nodular center were obtained with plain and enhanced. Results The 13 foci (54.2%) were located in the lobus superior of pulom dexter, 5 foci (20.8%) in lobus inferior. The 6 foci were located (25.0%) in the lobus superior of pulmo sinister. The size of PST was 1.0cm to 3.8cm. The 18 foci were clear of verge and 6 foci were dim. The 16 foci had statllite focus. The 8 foci had calcification. No enhancement had 15 foci. The capsular enhancement had 8 foci. 1 focus showed extensive enhancement. Conclusion HRCT may show the verge and density of preferable. The change of density after enhancement was helpful in diagnosing and differential diagnosis of the PST.

Medical Image Diagnosis of Acute Cerebral Infarction

ZHANG Zai-pei

2003, 12(4): 31-35.

Abstract(762) PDF(0)

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Objective : Cerebral Infarction is a common disease which threatens humans health seriously so that it should be diagnosed in the early phase in order to decide proper therapy. Methods : Medical Image Diagnosis of Acute Cerebral Results : Infarction was evaluated by ways of reviewing the related literature both from China and abroad and observing clinical practices. Conclusio n: Multi-helix CT and functional MRI were considered at present as the best method to diagnose Acute Cerebral Infarction.

Spatial Resolution and Fourier Analysis for X-ray Medical Device

WANG Xue-li

2003, 12(4): 36-41.

Abstract(965) PDF(2)

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This paper analyzes the factors affecting the spatial for X-ray medial devices. From principle, we use the Fourier method to compare the information consistency in the spatial domain and frequency domain for traditional X-ray, CT and Tomosynthesis device. This will help medical researchers and doctors to deepen the comprehension for the spatial resolution and its relationship with the collected information.

The Application Study of Dam Leakage with Resistivity Tomography

LÜ Yu-zeng, RUAN Bai-yao

2003, 12(4): 42-46.

Abstract(1013) PDF(1)

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Objective :The resistivity tomography method has been widely applied in virtue of high density, high resolution and so on. It also has a good future on detecting leakages of dams. Meterials and Methods : Through analyzing the popular models of leakages of dams, the paper introduces the methods of work and interpretation on resolving leakages of dams. Result : Finally, using 3-D finite element method to model the leakages of an embankment dam,for example. Conclusion : Interpreting the result of modeling, it gets a satisfactory effect.

Review about Geo-Tomography and disasters Prediction, quoted from IUGG Congress, 2003

2003, 12(4): 49-52.

Abstract(871) PDF(0)

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Purpose : Provide the current advanced scientific information from international symposium in geophysical conference (IUGG, 2003), to understand the international top situation at the front of some main currents information which related with geo-tomography,seismic tomography and disaster prediction. Material and Method : These information are selected from IUGG Program& Abstracts Disk, choose its contents which related with the topics of geo-tomography, and provide the academic exchange service. Conclusion : The method of geo-tomography,seismic tomography are widely used in more geo-science field. The experiences of volcano eruption forecast and flood prediction may be used reference for earthquake prediction. The improvement of 3D image display of underground physics parameters, getting higher resolution, that will cause the variety on forecast model take place quality upswing.

Brief Introduction of NUCTECH CO. LTD

CHEN Zhi-qiang, HE Xiao-yi

2003, 12(4): 47-48.

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2003 Vol. 12, No. 4