Résumé
<p><b>OBJECTIVE</b>To observe the anatomic structure of Huantiao (GB 30) visually, to imitate the inserting process of the needle to explore the safty of needle insertion and improve the therapeutic effect of acupuncture in clinic.</p><p><b>METHODS</b>Combined with anatomic structure of acupoint, muscles and other tissues related with Huantiao (GB 30) were interactively segmented in VOXEL-MAN with the computer graphics technology. Nerves and blood vessels were reconstructed by establishing mathematic model, and the needle-inserting animation of Huantiso (GB 30) was obtained by running script file.</p><p><b>RESULTS</b>The three-dimensional (3-D) visualization of Huantiao (GB 30) on needle-inserting animation was accomplished, the spatial location and expression of Huantiao (GB 30) in the digitized virtual human body were observed, the virtual inserting process was imitated realistically, and the 3-D animation of needle insertion at Huantiao (GB 30) was created.</p><p><b>CONCLUSION</b>Building mathematic model is favorable for expressing the anatomic structure of Huantiao (GB 30) in 3-D space, imitating the process of needle insertion realistically and observing the spatial structure of the point and the around tissues, which can provide a solid foundation for the safety of needle insertion of acupoints and improve therapeutic effect of acupuncture in clinic.</p>
Sujets)
Humains , Points d'acupuncture , Thérapie par acupuncture , Infographie , Imagerie tridimensionnelleRésumé
<p><b>OBJECTIVE</b>To discuss the mechanical virtual reality when acupuncture on Jianliao (TE 14) so as to get perform perceptual knowledge of acupuncture for beginners through studying 3D reconstruction of surrounding tissues of this acupoint.</p><p><b>METHODS</b>Related tissues were segmented and reconstructed by establishing mathematics model based on the operational platform of VOXEL-MAN (vision reappearance); and mechanical model was constructed and fused with related data of virtual human (touch reappearance); data communication between the force feedback apparatus and the operational platform of virtual human were set up by interchanging vision reappearance module and touch reappearance module.</p><p><b>RESULTS</b>In Linux system, the operator could experience the mechanical changes while needle-tip passing various tissues of Jianliao (TE 14) as well as lifting and thrusting evenly in needling process through the force feedback apparatus.</p><p><b>CONCLUSION</b>Based on the platform of VOXEL-MAN, the sensation of needling at jianliao (TE 14) could be reappeared idealy by strength feedback instrument, so that the beginners could imitate, learn and practice the virtual acupuncture.</p>
Sujets)
Humains , Points d'acupuncture , Thérapie par acupuncture , Phénomènes biomécaniques , Simulation numérique , Imagerie tridimensionnelle , Thérapie assistée par ordinateur , Interface utilisateurRésumé
In a PACS system, doctors can avoid the mistakes in filing chest radiographs by comparing the new image with the old ones from the same patient. An automatic method with digital image processing technology is introduced in the paper, which is realized by general location of anatomical structures, local image registration and BP artificial neural network, so as to achieve good results for identity recognition.
Sujets)
, Système identification patient , Interprétation d'images radiographiques assistée par ordinateur , Méthodes , Radiographie thoracique , MéthodesRésumé
In this paper the concept of molecular imaging is introduced, and its importance is addressed. Besides, the key points of molecular imaging are briefly reviewed from a view of engineering. Particular emphasis is given to the analysis of the function and the position of traditional medical imaging modalities in the era of molecular imaging. Finally a discussion is made for the further development of medical imaging modalities along the line of molecular imaging.
Sujets)
Imagerie diagnostique , Méthodes , Imagerie moléculaireRésumé
This paper discusses the application of virtual reality technology in the 3-D visible human body and acupuncture research. Based on the 3-D visible human fused with the localization information and hierarchy of acupoints, the paper analyzes the force against the needle and haptic rendering during the needle manipulation according to the physical properties of different tissues. A haptic model is constructed to demonstrate the force behaviors during acupuncture, and the force will be produced and passed to the manipulator by a force feedback device. It enriches the contents of 3-D visible human project, provides a dynamic simulation instrument for acupuncture teaching, and supplies a platform for acupuncture research.
Sujets)
Humains , Thérapie par acupuncture , Méthodes , Chine , Simulation numérique , Rétroaction , Imagerie tridimensionnelle , Interface utilisateur , Projets d'encyclopédie visuelle du corps humainRésumé
<p><b>OBJECTIVE</b>To study on visible display of Meridian on the dummy human body.</p><p><b>METHODS</b>Tube model-building method and computer technique were used, and data came from Voxel-Man dummy human body development platform.</p><p><b>RESULTS</b>The visual effect of re-building Meridian is very good and it can display the different layers of anatomic structures on the Meridian lines.</p><p><b>CONCLUSION</b>The visible display of Meridian on the dummy human body is preliminary realized, which provides data carriers for establishing the platform of Meridian study.</p>
Sujets)
Humains , Corps humain , MéridiensRésumé
<p><b>OBJECTIVE</b>To discuss the problem difficult to be presented for nerves and blood vessels in the 3D reconstruction of acupoints through studying 3D reconstruction of Jianliao (TE 14).</p><p><b>METHODS</b>Muscles and other tissues were segmented by applying cointeractive segmentation method based on chromatic characteristic space; the nerve and blood vessels can be reconstructed by establishing mathematics model, and the needle-inserting animation of Jianliao (TE 14) could be obtained by running script file.</p><p><b>RESULTS</b>During the course of 3D needle-inserting animation of Jianliao (TE 14), the spatial location between all kinds of tissues including the nerve and blood vessels and the needle body could be systematically observed.</p><p><b>CONCLUSION</b>The difficulty of presenting the nerve and blood vessels in the study on 3D reconstruction of acupoints can be resolved by establishing mathematics model. The generation of 3D animation for acupoints with the nerve and blood vessels is benefit to acupuncture teaching and study on the essence of acupoints and channels.</p>
Sujets)
Humains , Points d'acupuncture , Imagerie tridimensionnelle , Muscles , Système nerveuxRésumé
In this paper, we introduce the grid technology into the design of the distributed PACS. First, we analyse the architecture and functions of OGSA-DAI, and then, introduce a model of the distributed PACS based on OGSA-DAI, and give a detailed analysis on its basic components and workflow. Finally, we make a conclusion on the distributed PACS based on grid technology.
Sujets)
Humains , Réseaux de communication entre ordinateurs , Systèmes informatiques , Systèmes de gestion de bases de données , Mémorisation et recherche des informations , Méthodes , Informatique médicale , Systèmes d'information de radiologie , Logiciel , Conception de logiciel , Intégration de systèmesRésumé
DICOM-e-mail is a secure teleradiology protocol released by German Radiology Society and has already been applied clinically. To improve the robustness of the system, the protocol has been upgraded by adding some mechanisms such as system feedback. Moreover, a test method is also implemented by sending erroneous mails to application software that supports DICOM-e-mail. Through the tests for two different DICOM-e-mail teleradiology application, the validity of the new protocol is proved and at the same time some bugs are found. The implementation of the latest protocol and the general error tests can help to make the whole teleradiology system a better robustness. The implementation of DICOM-e-mail protocol in our country is also discussed in this paper.
Sujets)
Humains , Réseaux de communication entre ordinateurs , Normes de référence , Sécurité informatique , Normes de référence , Courrier électronique , Normes de référence , Internet , Systèmes d'information de radiologie , Normes de référence , Logiciel , TéléradiologieRésumé
In this paper, we have brought forward the framework design of DICOM software platform, using the SUR-DICOM-Lib software and have completed the connection test with the RSNA-CTNT Test Node. PACS, DICOM, realize
Sujets)
Humains , Réseaux de communication entre ordinateurs , Conception d'appareillage , Mémorisation et recherche des informations , Méthodes , Systèmes d'information de radiologie , Logiciel , Conception de logicielRésumé
In this paper, we proposed a new scan mode and image reconstruction method, which combines the data from both the linear accelerator and the cone-beam CT to reconstruct the volume with a limited rotation angle and low sampling rate. The classical filtered backprojection method and the iterative method are utilized to reconstruct the volume. The reconstruction results of the two methods are compared with each other with a relavant anlysis given here.
Sujets)
Humains , Algorithmes , Traitement d'image par ordinateur , Méthodes , Fantômes en imagerie , Amélioration d'image radiographique , Méthodes , Interprétation d'images radiographiques assistée par ordinateur , Méthodes , Radiochirurgie , Reproductibilité des résultats , TomodensitométrieRésumé
This paper presents a non-invasive and non-ionizing radiation method for assessment of osteoporosis by analyzing in vivo MR images. Texture features (entropy, coarse, etc...) derived from co-occurrence matrix and neighborhood graystone difference matrix are obtained. These features are significantly different between patients and control subjects. Then the grayscale MR image is transformed to the binary image, The shape and topology features (area, skeleton length, euler number, etc. ) obtained from the binary image show too significant differences between patients and control subjects.
Sujets)
Humains , Densité osseuse , Interprétation d'images assistée par ordinateur , Méthodes , Traitement d'image par ordinateur , Méthodes , Imagerie par résonance magnétique , Méthodes , Ostéoporose , AnatomopathologieRésumé
The computer-assisted surgery system is a complex system. All of the errors can be attributed to the loss of correspondence between the world coordinate system in the operation room and the virtual world coordinate system obtained from the multi-model medical images. The system's accuracy is composed of the accuracy of the localizer and that of registration. In order to improve the system accuracy, we analyse most of the possible error sources. The accuracy of the localizer affects deeply the registration between the intra-operation and pre-operation data. The localizer is the most basic and important part for a computer-assisted surgery system. We give a comprehensive possible error source at the end of the paper.
Sujets)
Algorithmes , Conception d'appareillage , Analyse de panne d'appareillage , Imagerie tridimensionnelle , Méthodes , Imagerie par résonance magnétique , Fantômes en imagerie , Logiciel , Chirurgie assistée par ordinateur , Méthodes , Tomographie par émission monophotonique , TomodensitométrieRésumé
The paper presents a 3D Brachytherapy Planning System based on CT/MRI images. Unlike other percutaneous radiotherapy planning systems, it provides doctors with an interactive source layout function, including accurate and quick dosage distribution calculation and dynamical 2D/3D display. A special template library and an integrated planning evaluation/alert subsystem are incorporated in the system. The system successfully has many functions such as data acquisition, registration, segmentation, image processing, 3D reconstruction and planning report output. Various automated procedures, 3-D graphics and a user-friendly interface GUI enable the system to be a powerful and practical one meeting well the chinical therapeutic demands.
Sujets)
Humains , Algorithmes , Curiethérapie , Traitement d'image par ordinateur , Imagerie tridimensionnelle , Imagerie par résonance magnétique , Dose de rayonnement , Planification de radiothérapie assistée par ordinateur , Logiciel , TomodensitométrieRésumé
This paper introduces a 3D medical image rendering system. The system uses the technology of COM with a fine upgradable and maintainable performances. Its main functions include image filtering, enhancement, image classification & segmentation, image registration, image interpolation and 3D display. The system can run on PC, so it owns a good practical value.
Sujets)
Humains , Algorithmes , Intelligence artificielle , Encéphale , Imagerie diagnostique , Amélioration d'image , Méthodes , Interprétation d'images assistée par ordinateur , Méthodes , Traitement d'image par ordinateur , Méthodes , Imagerie tridimensionnelle , Méthodes , Mémorisation et recherche des informations , Méthodes , Micro-ordinateurs , RadiographieRésumé
This paper presents a review of the quantitative analysis on pulmonary radiological images, including chest films and CT scans.
Sujets)
Humains , Algorithmes , Traitement d'image par ordinateur , Méthodes , Poumon , Imagerie diagnostique , Maladies pulmonaires , Imagerie diagnostique , , Interprétation d'images radiographiques assistée par ordinateur , Méthodes , TomodensitométrieRésumé
In this paper a brief history of the development of PACS in China is reviewed, the current status of PACS is presented, and its development in the future is discussed.