B. P. Selby, G. Sakas, S. Walter, U. Stilla, Medcom Gmbh Darmstadt
Abstract. Particle beam treatment allows accurate dose delivery onto carcinogen tissue. The reachable accuracy is limited by patient alignment errors relative to the beam source. Errors can be...
Pose Estimation of Eyes for Particle Beam Treatment of Tumors (2009)
B. P. Selby, G. Sakas, S. Walter, U. Stilla
Abstract. To assure a correct position and orientation of the patient’s eye in radiation treatment, a new approach in image-guided radiotherapy is used to determine the misalignment of the eye and...
Erweiterung modellbasierter Segmentierung durch lokale Deformationskriterien (2009)
Erdt, M., Tulchiner, R., Sakas, G.
Modellbasierte Ansätze sind heutzutage Stand der Technik zur automatischen Organsegmentierung in medizinischen Bilddatensätzen. In dieser Arbeit wird ein Verfahren vorgestellt, welches die...
A portable medical unit for medical imaging telecollaboration (2009)
Sachpazidis, I., Kontaxakis, G., Sakas, G.
In this paper, we are going to introduce a multimodal portable medical device for both medical imaging tele-collaboration and monitoring of vital parameters. The introduced portable unit offers...
Ultrasound and CT registration quality: Elastography vs. classical B-mode (2009)
Keil, M., Stolka, P.J., Wiebel, M., Sakas, G., McVeigh, E.R., Taylor, R.H., ...
Ultrasound and computed tomography registration is a valuable tool for interventional imaging and navigation, but current methods are limited in reliability or usefulness, requiring large fields of...
TraumaStation: A portable telemedicine station (2009)
Rizou, D., Sachpazidis, I., Salvatore, L., Sakas, G.
TraumaStation is a portable medical device which covers the mobility of the medical doctors as well as integrates the diversity of telemedicine devices. Many portable telemedicine devices have been...
Towards computer assisted cardiac catheterization how 3D visualization supports it (2009)
Drechsler, K., Laura, C.O., Sakas, G.
Although cardiac catheterization procedures take place under x-ray guidance, the doctor is almost blind. Vessels are almost invisible until he injects a contrast agent and looking only at 2D x-ray...
Wittenberg, T., Drechsler, K., Kaltenbacher, D., Friedl, S., Rotinat-Libersa, C., Reis, C., ...
The project MISS (Minimal invasive smart suture) provides solutions and concepts for several key issues within cardiac surgery. These issues include pre-operative imagebased stenosis detection and...
Closed loop: A classification framework for interventional procedures (2009)
Sakas, G., Grimm, M., Beni, S. De, Solbiati, L.
We present a closed-loop taxonomy framework for interventional procedures assisting to understand and locate an increasing number of "buzzword driven" techniques within the workflow of the...
Feature extraction from medical images for an oral cancer reoccurrence prediction environment (2009)
Steger, S., Erdt, M., Chiari, G., Sakas, G.
We present the concept of a novel image feature extraction approach that will be used to predict oral cancer reoccurrence in the scope of the NeoMark project. Based on current clinical practice, we...
I. A. Sachpazidis, R. Ohl, C. A. Polanczyk, M. S. Torres, L. A. Messina, A. Sales, ...
Abstract—In this paper, we are going to depict a medical tele-consultation network for medical imaging that has been deployed in Brazil. Preliminary outcomes of the medical network will be...
Selby, P., Sakas, G., Walter, S., Stilla, U.
Particle beam treatment allows accurate dose delivery onto carcinogen tissue. The reachable accuracy is limited by patient alignment errors relative to the beam source. Errors can be corrected...
Medication intake assessment (2008)
Today, more than 430 million people worldwide are estimated to be suffering at any given time from mental disorders. Surprisingly, there is limited awareness that mental disorders are a major cause...
Autonomous navigation assistant for MRI guided interventions (2008)
Friebe, M., Sachtler, D., Hellwig, S., Schlüter, M., Sakas, G., Jorczyck, U.
Interventions, like biopsies, tumor therapy, injection of drugs, placements of intravascular implants (stents, coils, etc.) and many more are performed image guided. MRI would be the preferred...
Medical imaging techniques form the basis for medical diagnostics as well as for planning, procedure and check-up of most diverse kind of therapies. Detailed data is received nowadays by steadily...
Image and medical data communication protocols for telemedicine and teleradiology (2008)
Die gegenwärtige Telemedizin dient der Überbrückung der physischen Distanz zwischen Patienten in abgelegenen Gebieten und medizinischen Spezialisten rund um die Welt. Verteilte Client-Server...
Selby, P., Sakas, G., Walter, S., Stilla, U.
To align patients in radiation devices in six degrees of freedom (DoF), image-guided approaches perform the task of correction computation for the patient position. Digital radiography (DR) images...
Internal evaluation of registration results for radiographic images (2008)
Selby, P., Sakas, G., Walter, S., Stilla, U.
This work focuses on internal gray level based evaluation of image registration results. The motivation is to provide an approach for self-diagnosis in the scope of a patient alignment system based...
Dold, C., Bockholt, U., Roth, M., Heussel, C.P., Gosepath, J., Sakas, G.
A training and simulation system for therapy planning is developed based on patient specific imaging data. A real endoscope is used for navigation through the virtual patient. For this purpose...
Pose estimation of eyes for particle beam treatment of tumors (2007)
Selby, P., Sakas, G., Walter, S., Stilla, U.
To assure a correct position and orientation of the patient's eye in radiation treatment, a new approach in image-guided radiotherapy is used to determine the misalignment of the eye and the...
2D-3D fusion imaging (US & CT/MR): Interventional US applied to liver RF ablation (2007)
Beni, S. De, Grimm, M., Maccio, M., Sakas, G., Solbiati, L.
Image guidance is essential in the treatment of liver tumours using percutanous ablative techniques. Apart from careful pre-procedure planning and elaborate post-procedure evaluation, accurate...
Baltas, D., Sakas, G., Steckenreiter, O., Karabis, A., Giannouli, S., Sauvonet, B., ...
Ultrasound imaging offers a fast, inexpensive, radiation-free and portable image processing method. In the field of prostate cancer treatment, ultrasound imaging can be used for diagnosis and therapy...
Freehand 3D/4D ultrasound: Extending existing U/S devices (2007)
3D ultrasound is the extension of 2D ultrasound to the third dimension. In case of acquiring heat motion, we speak about 4D (3 spatial and one temporal dimension). Our 3D/4D approach uses a 2D...
MiniPACS implementation in telemedicine (2007)
MedCom MiniPACS offers access, management, archiving and easy transfer of medical images.Importing U/S, CT, MR and many other DICOM Images is possible. Especially important is a variance offering...
Detection of pose changes for spatial objects from projective images (2007)
Selby, P., Sakas, G., Walter, S., Stilla, U.
Numerous fields of application effort the detection of pose changes for 3 dimensional objects in six degrees of freedom (6 DoF). Automatic procedures that exploit 2D images for the detection of pose...
Geometry calibration for x-ray equipment in radiation treatment devices (2007)
Selby, P., Sakas, G., Walter, S., Stilla, U.
It is essential for radiological tumor treatment to position a patient very accurate in the treatment device. To avoid sub-millimetre misalignments for a patient in the treatment facility, X-ray...
3D aignment correction for proton beam treatment (2007)
Selby, P., Sakas, G., Walter, S.
The Bragg Peak of proton beams allows applying treatment doses onto carcinogen tissue with accuracy much below 1.0 mm and decreases the dose applied on surrounding tissue. The possible accuracy is...
Dold, C., Bockholt, U., Roth, M., Heussel, C.P., Gosepath, J., Sakas, G.
Auf Grundlage patientenspezifischer Bilddaten wurde ein Trainings- und Simulationssystem entwickelt, mit dem eine anstehende Therapie vorbereitet werden kann. Zur Navigation durch die Bilddaten wird...
Sachpazidis, I., Konnis, G., Kiefer, S., Rohm, K., Lozano, A., Yunda, L., ...
Developing countries have very high patients-perdoctor ratios that are a common indicator of the amount of healthcare that exists in a region. As a point of comparison, developed countries such as...
European health telematics networks for positron emission tomography (2006)
Kontaxakis, G., Pozo, M.A., Ohl, R., Visvikis, D., Sachpazidis, I., Ortega, F., ...
A pilot network of positron emission tomography centers across Europe has been setup employing telemedicine services. The primary aim is to bring all PET centers in Europe (and beyond) closer, by...
Dold, C., Bockholt, U., Sakas, G., Roth, M.
Auf Grundlage patientenspezifischer Bilddaten wird ein Trainings- / Simulationssystem entwickelt, mit dem eine anstehende Therapie vorbereitet werden kann. Die untersuchten Fälle können...
Dold, C., Zaitsev, M., Speck, O., Firle, E., Hennig, J., Sakas, G.
Patient motion remains a significant problem in many magnetic resonance (MR) imaging (MRI) applications, including functional MRI (fMRI) (1 and 2) and cardiac and abdominal imaging, as well as...
A medical network for teleconsultations in Brazil and Colombia (2006)
Sachpazidis, I., Kiefer, S., Selby, P., Ohl, R., Sakas, G.
Access to medical care is sometimes very difficult to be reached from people living in rural and underserved areas. That problem is very well known in rural areas in Brazil and Colombia. Citizens...
Enhanced medical services in Amazon over AmerHis satellite (2006)
Sachpazidis, I., Selby, P., Binotto, A., Sakas, G., Pereira, C.
In this paper we are going to present a tele-medical network connecting physician/hospitals over satellite based on DVB-RCS over AmerHis satellite. The medical applications include general obstetric,...
Zaitsev, M., Dold, C., Sakas, G., Hennig, J., Speck, O.
Subject motion and associated artefacts limit the applicability of MRI and the achievable quality of the images acquired. In this paper, a fully integrated method for prospective correction of...
Kontaxakis, G., Visvikis, D., Ohl, R., Sachpazidis, I., Suarez, J., Selby, P., ...
TENPET (Trans European Network for Positron Emission Tomography) aims to evaluate the provision of integrated teleconsultation and intelligent computer supported cooperative work services for...
Processing and segmentation of 3D images (2006)
The article summarises the technological developments of the recent years in the area of Processing and segmentation of 3D Images. It reviews the established method in the areas of Pre-processing,...
Mobile tele-echography systems - teleinvivo: A case study (2006)
Kontaxakis, G., Sakas, G., Walter, S.
Telemedicine, defined as practice of medicine at a distance, has been performed ever since humans learned to communicate: a messenger carrying over a medical advice from a distant expert to the bed...
After segmentation, the choice of which rendering technique to use must be made. The more traditional surface-based methods first create an intermediate surface representation of the object to be...
TeleHealth networks. Instant messaging and point-to-point communication over the internet (2006)
Sachpazidis, I., Ohl, R., Kontaxakis, G., Sakas, G.
This paper explores the advantages and disadvantages of a medical network based on point-to-point communication and a medical network based on Jabber instant messaging protocol. Instant messaging...
T@lemed: Ehealth applications applied to underserved areas in Latin America (2006)
Sachpazidis, I., Ohl, R., Binotto, A., Torres, M.S., Messina, L.A., Sales, A., ...
Access to medical care is sometimes very difficult to be reached from people living in rural and underserved areas. This problem is very well known in rural areas in Brazil. Citizens have no access...
Guest Editors' Introduction: Simulators and closed interaction loops (2006)
Simulation systems for medical training and treatment planning should create an immersive and realistic feeling similar to treating a real patient. They should provide realistic views, support haptic...
3D simulation of external beam radiotherapy (2005)
Radiation therapy treatment is a very demanding cancer treatment process. The aim of the treatment is to cure or to limit the disease using high-energy radiation dose, having as minimum as possible...
Klein, K., Sakas, G., Schumann, H.
DE 10331460 A UPAB: 20050316 NOVELTY - Arrangement for measuring 3D geometrical data of the surfaces (4) of real objects (1), has a robot (12) with a multiplicity of degrees of freedom of movement....
Anwendungen der Virtuellen und Erweiterten Realität in der Medizin (2005)
Rechnergestützte Verfahren beginnen den medizinischen Alltag und die chirurgische Praxis zu revolutionieren. Insbesondere Techniken aus den Bereichen "Virtuelle Realität und Erweiterte Realität"...
Kontaxakis, G., Guerra, P., Ohl, R., Sachpazidis, I., Strauss, L., Ortega, F., ...
El proyecto TENPET (Trans European Networks for Positron Emission Tomography) tiene como objetivo evaluar el impacto en la practica clínica de servicios integrados de teleconsulta y trabajo...
Telemonitoring of medication adherence in patients with Schizophrenia (2005)
Frangou, S., Sachpazidis, I., Stasinakis, A., Sakas, G.
Nonadherence to medication is a widespread problem in schizophrenia and is associated with poor clinical outcomes and inappropriate management and utilization of resources. The aim of the current...
Sachpazidis, I., Ohl, R., Polanczyk, C., Torres, M., Messina, L.A., Sales, A., ...
In this paper, we are going to depict a medical tele-consultation network for medical imaging that has been deployed in Brazil. Preliminary outcomes of the medical network will be presented. In...
Dold, C., Zaitsev, M., Speck, O., Firle, E., Hennig, J., Sakas, G.
Subject motion appears to be a limiting factor in numerous magnetic resonance imaging (MRI) applications. For head imaging the subject's ability to maintain the same head position for a considerable...
Khan, M.F., Dogan, S., Maataoui, A., Gurung, J., Schiemann, M., Ackermann, H., ...
The aim of this work was to determine the accuracy of a new navigational system, Medarpa, with a transparent display superimposing computed tomography (CT) reality on the site of intervention....
Chirurgisches Training mit Technologien der Virtuellen Realität (2005)
Rechnergestützte Verfahren beginnen den medizinischen Alltag und die chirurgische Praxis zu revolutionieren. Insbesondere Techniken aus den Bereichen "Virtuelle Realität" und "Erweiterte Realität"...
Accuracy of Biopsy Needle Navigation Using . . . (2005)
M. Fawad Khan, Selami Dogan, Adel Maataoui, Jessen Gurung, Mirko Schiemann, Hanns Ackermann, ...
The aim of this work was to determine the accuracy of a new navigational system, Medarpa, with a transparent display superimposing computed tomography (CT) reality on the site of intervention....
MEDARPA: BMBF-Projekt: Schlußbericht. Projekt-Laufzeit: 01.04.2001 - 31.03.2004 (2004)
Zu Beginn des Medarpa-Projekts gab es bereits AR-Anwendungen innerhalb und außerhalb der Medizin, die aber nicht für die in Medarpa angestrebten Ziele passend waren. AR-Technologie als solche war...
Virtual CT-3D simulation using exomio: With special reference to prostate cancer (2004)
Zamboglou, N., Karangelis, G., Nomikos, I., Zimeras, S., Kolotas, C., Baltas, D., ...
The paper describes a new CT based 3D virtual simulator system called EXOMIO that has been developed at the Institut für Graphische Datenverarbeitung [Fraunhofer IGD] in collaboration with the...
Updating of MRI gradients using a infrared tracking system to compensate motion artifacts (2004)
Dold, C., Zaitsev, M., Speck, O., Firle, E., Hennig, J., Sakas, G.
Functional MRI (fMRI) is a non-invasive imaging technique that is used to investigate cerebral function. Patient motion remains a significant problem in many MRI applications, including fMRI, cardiac...
Medication adherence system using SMS technology (2004)
Sachpazidis, I., Fragou, S., Sakas, G.
Adherence is the degree to which patients conform to a given treatment plan. Despite the potential for serious psychiatric or medical consequences, patients do not always adhere to their prescribed...
MEDARPA: BMBF-Projekt: Schlußbericht. Projekt-Laufzeit: 01.04.2001 - 31.03.2004 (2004)
Zu Beginn des Medarpa-Projekts gab es bereits AR-Anwendungen innerhalb und außerhalb der Medizin, die aber nicht für die in Medarpa angestrebten Ziele passend waren. AR-Technologie als solche war...
Prospective head motion compensation by updating the gradients of the MRT (2004)
Dold, C., Firle, E., Sakas, G.
Subject motion appears to be a limiting factor in numerous magnetic resonance imaging applications. For head imaging the subject's ability to maintain the same head position for a considerable period...
Computer aided surgery based on auto-stereoscopic augmented reality (2004)
Paloc, C., Carrasco, E., Macía, I., Gómez, R., Barandiarán, I., Jiménez, J.M., ...
Although Augmented Reality (AR) promises to provide valuable means for Computer-Aided Surgery, the underlaying technologies often create a cumbersome work environment that is inadequate for clinical...
Verfahren zur modellbasierten Restauration von Zahndefekten (2004)
Modeling of the occlusal surface of teeth is an important problem in computer-aided design of dental restorations. The designed shape must fit the existing individual anatomy of the patient. Also,...
Dold, C., Younis, W., Winter, J., Sakas, G., Firle, E., Stergiopoulos, S.
We aim to provide a next generation magnetic resonance imaging (MRI) system technology with an integrated solution for reducing motion artifacts in brain imaging applications. New developments in the...
Rechnergestützte Therapie unter Berücksichtigung patientenspezifischer Biomechanik (2004)
Computer-assisted methods have emerged in medical diagnosis and therapy planning. Thereby the planning often relies on a 3D model of the anatomical structures reconstructed from medical image data...
Medarpa-implantation of brachytherapy-catheters using augmented reality. An update (2004)
Roddiger, S., Baltas, D., Sakas, G., Wesarg, S., Zogal, P., Schwald, B., ...
MEDARPA - implantation of brachytherapy-catheters using augmented reality (2004)
Röddiger, S., Baltas, D., Sakas, G., Schnaider, M., Wesarg, S., Zogal, P., ...
Instant messaging: A communication layer for medical applications (2004)
Sachpazidis, I., Ohl, R., Sakas, G.
Instant messaging has been used for communication among users even in wireless or wire line networks. In this paper we are going to propose architecture, integrating instant messaging service with...
Fast smoothing of superficial respiratory artifacts on medical surfaces (2003)
Karangelis, G., Firle, E., Zamboglou, N., Sakas, G., Borman, U.
Respiratory artifacts appear very often in medical volumes when the subject under examination is in free respiration conditions. Such artifacts cause a severe deformation to the external body anatomy...
Unterstützung der Krebstherapie: 3D-Simulationsprogramm EXOMIO (2003)
Das weltweit zugelassene Simulationsverfahren EXOMIO erhöht die Präzision und Qualität einer Strahlentherapie und gestaltet den Behandlungsprozess schonend für den Patienten und flexibel für den...
Unterstützung der Krebstherapie (2003)
Das weltweit zugelassene Simulationsverfahren EXOMIO erhöht die Präzision und Qualität einer Strahlentherapie und gestaltet den Behandlungsprozess schonend für den Patienten und flexibel für den...
EXOMIO virtual simulation: Oropharynx, prostate and breast cancers (2003)
Zamboglou, N., Karangelis, G., Nomikos, I., Zimeras, S., Helfmann, T., Uricchio, R., ...
Simulators are medical devices used in the oncology clinics to perform the simulation for the external beam radiotherapy treatment. Unlikely for a clinic to obtain a real Simulator is a high...
Accuracy of 3-D needle navigation in interstitial brachytherapy in various body regions (2002)
Straßmann, G., Heyd, R., Cabillic-Engenhart, R., Kolotas, C., Walter, S., Sakas, G., ...
Hintergrund: Eine präzise Immobilisation des Patienten während der extrakranialen stereotaktischen 3-D-Navigation ist zur Minimierung von Patientenbewegungen für die CT-Bildaufnahme und die...
A free hand navigation system for brachytherapy (2002)
This paper describes a free hand navigation system for high-dose-rate brachytherapy. The whole system pipeline consists of four steps, namely, pre-processing, pre-operational planning,...
Trends in Medical Imaging: From 2D to 3D (2002)
In recent years, three important new developments have dominated the world of medical imaging: ''better diagnosis alone'' is not desired by end users if there is no impact on the therapy procedure;...
Sakas, G., Großkopf, S., Cai, W., Bendl, R., Kieber, M., Stiehle, M., ...
Bei etwa 30% der Krebserkrankungen mit letalem Ausgang wird die lokale Tumorprogredienz verantwortlich gemacht. Die Verbesserung der lokalen Tumortherapie ist deshalb ein großes Anliegen der...
Volume definition tools for medical imaging applications (2001)
Karangelis, G., Zimeras, S., Firle, E., Wang, M., Sakas, G.
The definition of structures and the extraction of organ's shape are essential parts of medical imaging applications. These might be applications like diagnostic imaging, image guided surgery or...
In der Medizin werden sensible Entscheidungen zunehmend in allen Phasen der Behandlung (Diagnose, Planung, Durchführung und Kontrolle der Therapie) auf der Grundlage von Bildmaterial getroffen. Die...
Neugebauer, P.J., Liedtke, C.E., Sakas, G.
Die dreidimensionale Modellierung realer Objekte inklusive ihrer Textur stellt trotz der heute verfügbaren 3D-Sensoren immer noch eine herausfordernde Aufgabe dar, da die Objekte zu ihrer...
EU-TeleInViVo: Three-dimensional Ultrasound Telemedical Workstation (2001)
Sakas, G., Walter, S., Kontaxakis, G.
Worldwide, people living in rural and remote areas struggle to access timely, quality medical care. Residents of these areas often have substandard access to specialty healthcare, primarily because...
Exomio: A 3D-simulator for external beam radiotherapy (2001)
Karangelis, G., Zamboglou, N., Baltas, D., Sakas, G.
Simulators are medical devices used in the oncology clinics to perform the simulation procedure for the external beam radiotherapy treatment. Unlikely for a clinic to obtain a real Simulator is a...
Advanced Applications of Volume Visualization Methods in Medicine (2001)
Sakas, G., Karangelis, G., Pommert, A.
This State of The Art Report summarises the application of techniques developed over the recent years for visualising volumetric medical data acquired by modern medical imaging modalities such as CT,...
Sakas, G., Walter, S., Kontaxakis, G.
Worldwide, people living in rural and remote areas struggle to access timely, quality medical care. Residents of these areas often have substandard access to specialty health care, primarily because...
Navigation System for Interstitial Brachytherapy (2000)
Straßmann, G., Kolotas, C., Heyd, R., Walter, S., Baltas, D., Martin, T., ...
To develop a computed tomography (CT) based electromagnetic navigation system for interstitial brachytherapy. This is especially designed for situations when needles have to be positioned adjacent to...
Straßmann, G., Walter, S., Kolotas, C., Heyd, R., Baltas, D., Debertshäuser, D., ...
To present the development of a new navigation and reconstruction system based on an electromagnetic free-hand tracker and on CT imaging for treatment planning of intraoperative high-dose-rate...
Kontaxakis, G., Walter, S., Sakas, G.
A transportable telemedicine workstation has been de-signed, developed and evaluated for use in isolated areas such as islands, rural areas and crisis situation areas. The EU-TeleInViVo is a...
Behr, J., Großkopf, S., Hong, H., Peng, Y., ...
Due to the development of new imaging devices, which produce a large number of tomographic slices, advanced techniques for the evaluation of large amounts of data are required. Therefore,...
3D heart modelling from biplane, rotational angiocardiographic X-ray sequences (2000)
Kehl, H.G., Jäger, J., Gehrmann, J., Vogt, J., Sakas, G., Kassenböhmer, R., ...
The 3DHeartView project produced an advanced software application for time-variant 3D cardiac modelling based on back projection of rotational X-ray angiographic sequences. Due to standard DICOM 3.0...
Collaborative Virtual Simulation Environment for Radiotherapy Treatment Planning (2000)
Cai, W., Walter, S., Sakas, G.
The simulation of Radiotherapy Treatment Planning (RTP) is a normal procedure in oncology clinics carried out on a Simulator machine. The Virtual Simulation of RTP replaces the real Simulator machine...
In ViVo-Brachy: A Navigation System for Interstitial Brachytherapy (2000)
Walter, S., Straßmann, G., Zamboglou, N., Kolotas, C., Sakas, G.
HDR brachytherapy is a is a kind of radio therapy that amongst other methods can be performed with interstitial needles. An important working step in this treatment is the fast and accurate...
Freihandakquisition, Rekonstruktion und Visualisierung von 3D- und 4D-Ultraschall (2000)
Sakas, G., Walter, S., Grimm, M., Richtscheid, M.
3D-Ultraschall wird in den nächsten Jahren eine weite Verbreitung in der medizinischen Anwendung erfahren. Die Methode erweitert die bekannte Sonographie um die dritte Dimension, kann deshalb...
3D Modellierung zur Diagnose und Behandlungsplanung in der Kardiologie (2000)
Behr, J., Großkopf, S., Hong, H., Hildebrand, A., ...
Die Entwicklung einer neuen Generation bildgebender Geräte ermöglicht die Akquisition hochauflösender tomographischer Datensätze. Als Ergebnis liegt eine grosse Anzahl der Schichten vor, sodass...
Sakas, G., Walter, S., Kontaxakis, G.
Worldwide, people living in rural and remote areas struggle to access timely, quality medical care. Residents of these areas often have substandard access to specialty health care, primarily because...
Trends in der medizinischen Bildverarbeitung: Von 2D zu 3D (1999)
Die bildgebenden Verfahren haben die medizinische Praxis in den letzten Jahren dermaßen tiefgreifend verändert, daß sie längst nicht nur unverzichtbar sondern schlicht und einfach nicht mehr weg...
Freehand Scanning for Precordial Data Acquisition in Three-Dimensional Echocardiography (1999)
Richtscheid, M., Grimm, M., Sakas, G.
Computer-based three-dimensional (3D) visualisation of the heart is an important step forward towards improved analysis of complex cardiac structures and reliable quantification of volumes. In the...
Trends in der medizinischen Bildverarbeitung: Von 2D zu 3D (1999)
Die bildgebenden Verfahren haben die medizinische Praxis in den letzten Jahren dermaßen tiefgreifend verändert, daß sie längst nicht nur unverzichtbar sondern schlicht und einfach nicht mehr weg...
Transfer Functions in DRR Volume Rendering (1999)
Digital Reconstruction Radiography (DRR) is an important technique in radiotherapy imaging applications. DRR volume rendering aims to render DRR images using CT or other tomographic data set. Besides...
Volume Interaction Techniques in the Virtual Simulation of Radiotherapy Treatment Planning (1999)
Cai, W., Sakas, G., Karangelis, G.
The simulation of Radiotherapy Treatment Planning (RTP) in a normal procedure in oncology clinics carried out on the Simulator: The Virtual Simulation of RTP replaces the real Simulator with a...
Data Intermixing and Multi-volume Rendering (1999)
The main difference between multi-volume rendering and mono-volume rendering is data intermixing. In this paper, we present three levels of data intermixing and their rendering pipelines in direct...
Free-Hand Acquisition, Reconstruction, and Visualization of Three-Dimensional Data Sets (1998)
3D Ultrasound represents one of the latest devel-opments in medical tomography. Its access to general use, however, is hindered by the existing devices which are still rather expensive for the...
TeleInViVo - A 3D Ultrasound TeleMedical Workstation (1998)
The aim of TeleInViVo project which is founded by the European Commission in the Telematics Application Programme, Sector Healthcare is to set-up a transportable telemedicine workstation (PC plus...
InViVo-IORT - A System for Quality Control in Intra-Operative Radio Therapy (1998)
Walter, S., Straßmann, G., Schmitt, M., Kolotas, C., Nier, H., Zamboglou, N., ...
Intra operative radio therapy (IORT) is applied after the surgical removal of a tumour but still during the operation at the open situ with the objective to irradiate remains of the tumour that could...
Freihand Akquisition, Rekonstruktion, und Visualisierung von 3D Ultraschall (1998)
Grimm, M., Lahanas, M., Richtscheid, M., Walter, S., Sakas, G.
4D/5D echocardiographic data visualization (1998)
In this paper we describe the application of volume rendering techniques for the fast display of 3D, 4D up to 5D cardiac ultrasound data. We use a volume rendering approach for the fast data...
17th Annual European Computer Graphics Conference : Eurographics '96 (1997)
Rossignac, J, Sillion, F, Hildebrand, A, Neugebauer, P J, Sakas, G, Ziegler, R
Dreidimensionale Bildrekonstruktion aus Ultraschall-Daten (1997)
3D Ultraschall stellt eine der neuesten Entwicklungen der medizinischen Tomographie dar. Zur Zeit ist 3D Ultraschall aber wegen der fuer die medizinischen Routine zu teuren, umstaendlich zu...
Angiokardiographien in drei Dimensionen: Methodik, Evaluation und diagnostische Ausblicke (1997)
Kehl, H.G., Jäger, J., Kececioglu, D., Sakas, G., Rellensmann, G., Nekarda, T., ...
Advanced Applications of Volume Visualization Methods in Medicine (1997)
Tomographic medical imaging techniques have become more popular in recent years. The wide availibility of CT, MRI and Ultrasound in most large hospitals results in a rapidly increasing number of...
Im Rahmen der praenatalen Frueherkennung von z.B. anatomischen Missbildungen kann die herkoemmliche Ultraschall-Untersuchung mit ihrer 2-dimensionalen Darstellung nur begrenzt aussagekraeftige...
Case study: Visualization of laser confocal microscopy datasets (1996)
Sakas, G., Vicker, M.G., Plath, P.J.
This paper presents an example of how existing visualization methods can be successfully applied - after minor modifications - for allowing new, sometimes unexpected insight in scientific questions,...
Eurographics '96 Tutorial: A Homogenous Approach from Image Processing to Virtual Reality (1996)
Hildebrand, A., Neugebauer, P.J., Sakas, G., Ziegler, R.
Our target is to present the complete image analysis / synthesis- pipeline in the widest sence: Our pipeline is typical for most computer graphics and engineering applications and has four major...
Preprocessing and volume rendering of 3D ultrasonic data (1995)
The "noisy and blurry" nature of biomedical ultrasonic data makes the rendering of 3D models difficult. The volume rendering system described in this article generates high-quality images in seconds...
Ultraschall-Bilder werden dreidimensional: Strahlungsfreie Rekonstruktion des Körperinneren (1995)
Die tomographischen bildgebenden Verfahren wie MR, CT, SPECT usw. haben eine wahre Revolution im Bereich der Diagnostik ausgelöst, die sich mit der Erfindung der Röntgenstrahlen vergleichen lässt....
Results of the 1994 Survey on Image Synthesis (1995)
At the 1992 Rendering Workshop in Bristol, Michael Cohen presented the results of what he called a very unspecific survey of image sysnthesis researchers. This survey stimulated a great deal of...
Optimized Maximum Intensity Projection (MIP) (1995)
Sakas, G., Grimm, M., Savopoulos, A.
We present an improved version of the MIP algorithm that requires roughly 2 per cent- 10 per cent of the computational effort of the brute-force, straight-forward version. The algorithm conserves the...
Extracting Surfaces from Fuzzy 3D-Ultrasound Data (1995)
Rendering 3D models from 3D-ultrasonic data is a complicated task due to the noisy, fuzzy nature of ultrasound imaging containing a lot of artefacts. In the method presented in this paper we first...
Closing the Gap: from Computer Vision to Virtual Reality (1995)
Hildebrand, A., Neugebauer, P.J., Sakas, G., Ziegler, R.
Our target is to present the complete image analysis/synthesis-pipeline in the widest sense: Our pipeline is typical for most computer graphics and engineering applications and has four major stages:...
Case Study: Visualization of 3D Ultrasonic Data (1995)
3D Ultrasound is one of the most interesting non-invasive, non-radiative tomographic techniques. Rendering 3D modells from such data is not straight-forward due to the noisy, fuzzy nature of...
3D-Ultraschall Rekonstruktion (1995)
Die tomographischen bildgebenden Verfahren, wie z.B. MR, CT, SPECT, Nuklearmedizin etc., haben eine wahre Revolution im Bereich der Diagnostik ausgeloest, die mit der Erfindung der Roentgenstrahlen...
Optimized Maximum Intensity Projection (MIP) (1995)
Sakas, G., Grimm, M., Savopoulos, A.
We present an improved version of the MIP algorithm that requires roughly 2 per cent- 10 per cent of the computational effort of the brute-force, straight-forward version. The algorithm conserves the...
Eurographics '95 Tutorial: Closing the Gap: From Computer Vision to Virtual Reality (1995)
Hildebrand, A., Neugebauer, P.J., Sakas, G., Ziegler, R.
Our target is to present the complete image analysis/synthesis-pipeline in the widest sense: Our pipeline is typical for most computer graphics and engineering applications and has four major stages:...
Anwendung von 3D-Ultraschall (1994)
Ziel des Vorhabens war, ein System zu entwickeln, welches einerseits die Aussagekraft von 3D-Ultraschall erweitert, andererseits die Akzeptanz des Verfahrens erhöht und den klinischen Einsatz...
Texture shaping: A method for modeling arbitrarily-shaped volume objects in texture space (1994)
Texturing methods developed in the past years are well-suited for "solid objects", which possess a well-defined and sharp surface, but they are inadequate for texturing "foggy" volume objects. Here...
Perfect deception is the ambitious goal: Computer simulation of clouds and cloud movements (1993)
Graphical data processing is being increasingly employed to simulate movement and flow. The visual reproduction of poor visibility due to cloud trains and fog banks is playing a vital role, for...
X-raying - 3-D Medical Data. Video (1993)
Das Band zeigt die Möglichkeiten der Visualisierung medizinischer Daten durch Anwendung volumetrischer Techniken.
Pseudo-satellitefilm - using fractal clouds to enhance animated weather forecasting (1993)
We have developed a system which enables the national german meteorological office to generate Pseudo-Satellite images and video sequences based on their weather forecasting simulation data. With our...
Modeling and animating turbulent gaseous phenomena using spectral synthesis (1993)
This paper presents a new spectral synthesis method, motivated by the spectral turbulence theory, for visual modeling and the realistic and computer-effective animation of turbulent gaseous motion in...
InViVo - visualize of medical data (1993)
The two most frequently used presentation techniques for rendering volume data focus either on the reconstruction of the appearance of surfaces, used usually with medical data like CT or MRI, or on...
Advanced R and D topics on animation and scientific visualization (1993)
Encarnação, J.L., Englert, G., Haas, S., Klement, E., De Martino, J.M., Krömker, D., ...
Since its beginning in the early thirties, animation has been an application in its own right. Nowadays animation provides a set of tools, or is the basic technology for several other applications of...
3-D Visualization of MRA Data (1993)
After analyzing several possible illumination methods, we selected the maximum intensity projection as the method giving the most accurate results. In order to visualize small structures (thin...
Modeling and animating turbulent gaseous phenomena using spectral synthesis (1992)
This paper presents a new spectral synthesis method, motivated by the spectral turbulence theory, for visual modeling and the realistic and computer-effective animation of turbulent gaseous motion in...
Graphische Datenverarbeitung wird zunehmend eingesetzt um Bewegungsabläufe zu simulieren. Die Darstellung von erschwerten Sichtverhältnissen durch Wolkenzug und Nebelschwaden spielt zum Beispiel...
Interactive visualization of large scalar voxel fields (1992)
We present a technique allowing interactive visualization of large, scalar, discrete volume fields as semi-transparent clouds "on the fly", i.e., without preprocessing. Interactivity is not...
A functional approach to the visual simulation of gaseous turbulence (1992)
This paper presents a functional method for the visual simulation of 2-D or 3-D turbulent gaseous motion by using time-varying fractals. The used function incorporates results from the "spectral...
Methods for efficient sampling of arbitrary distributed volume densities (1992)
In recent years a number of techniques have been developed for rendering volume effects (haze, fog, smoke, clouds, etc.). Such techniques have been implemented for projective scanline renderers,...
Workshop - Integration von Animationswerkzeugen (1991)
Haas, S., Loseries, F., Sakas, G.
For realizing a computer animation product a lot of tolls are needed. In conventionell animations systems the tools distinguish in usage, user interface and data handling. The workshop should show up...
Foggy Bathroom und Zelle-Kern - Videoband (1991)
Animation von 1.5 min. Turbulenter 3D-Dampf steigt aus einer Badewanne auf; Rundgang durch ein Badezimmer 3D-Visualisierung des Nucleus einer Zelle. Zelldaten wurden aus Elektronenmikroskop gewonnen.
Sampling and anti-aliasing of discrete 3-D volume density textures (1991)
In recent years, a number of techniques have been developed for rendering volume effects (haze, fog, smoke, clouds, etc.) in order to enhance reality in computer-generated imagery as well as to...
Texture shaping: A method for modeling arbitrarily-shaped volume objects in texture space (1991)
Texturing methods developed in the past years are well-suited for "solid objects", which possess a well-defined and sharp surface. Therefore, such methods are unadequate for texturing "foggy" volume...
Methods for efficient sampling of arbitrary distributed volume densities (1990)
In recent years a number of techniques have been developed for rendering volume effects (haze, fog, smoke, clouds, etc.). SWuch techniques have been implemented for projective scanline renderers,...
Methoden für die realitätsnahe graphische Darstellung von Volumendaten (1990)
In den letzten Jahren wurden verschiedene Methoden entwickelt, um Volumendaten zu visualisieren. Im Gegensatz zu den üblichen Daten der Computergraphik weisen Volumendaten weder eine Oberfläche...
Fast rendering of arbitrary distributed volume densities (1990)
In recent years a number of techniques have been developed for rendering volume effects (haze, fog, smoke,clouds,etc.).These techniques are either time consuming (ray-tracing, radiosity) or do not...
A model for description and synthesis of heterogeneous-textures (1989)
Existing texture models either describe textures as a non-hierarchical surface property (by means of Markov chains, time series and other stochastic methods) or distinguish only between micro and...
A hierarchical model for texture description and synthhesis (1989)
Encarnação, J.L., Englert, G., Sakas, G.
Existing models either describe textures as a non-hierarchical surface (by means of Markov-chains, time series and other stochastical methods) or distinguish only between micro and macro textures....