le systeme decisionnel francais vu de i'exterieur donne, parait-il, i'idee d'un ensemble concu et fonctionnant suivant une rationalite plus ou moins optimale et classique. son examen de pres en procure, pourtant, une autre image. il illustre un systeme influence par un milieu appele « le milieu decisionnel central» compose principalement des membres des grands corps de l'eta...

In this study, statistical and fractal texture analysis was used to assess the ability of 30MHz Intravascular Ultrasound (IVUS) data, in raw and scan-converted form, to characterise atherosclerotic plaque. Data from 3 different plaque groups was assessed in the study, these were, loose fibrotic tissue (LFT), dense fibrotic tissue (DFT) and calcium (CA). The composition of each group was verifie...

Ultrasound imaging or ultrasonography is an important diagnosis method in medical analysis. It is important to segment out cavities, di erent types of tissues and organs in the ultrasound image for e ective and correct diagnosis. Human experts are very good in segmenting out the required region. But humans lack e ciency when size of dataset increases. The need of high reproducibility and need o...

In ultrasound-guided needle insertion procedures, tracking of the needle relative to the ultrasound image is beneficial for needle trajectory planning and guidance. A single camera closed-form method is proposed for automatic real-time trajectory tracking with a low-cost camera mounted directly on the ultrasound transducer. The camera is calibrated to the ultrasound image coordinates. By mounti...

Ultrasound medical imaging is widely used nowadays in clinical application due to its intuitive, convenient, safety, non-invasive, and low cost. However, ultrasound image formation always comes with speckle-noise which will greatly reduce the image quality, and makes the identification and analysis of image detail become more challenging. Hence, we present an extended robust diffusion algorithm...

3D freehand Ultrasound reconstruction is one of many choices to assemble 3D ultrasound volume from 2D ultrasound images with benefit in low-cost operations, conveniency and ease of usage which can be applied to intraoperative imaging. Ultrasound calibration is the procedure used to find the position and orientation of each acquired 2D ultrasound image in 3D space, hence is needed to be performe...

PNEUllOTHORAX DE L'ENFANT  Presentation de 17 cas. Revue de la litterature Par: Marandian M.H., Momenzadhe A., Wali­zade G., Kabiri M., A'skari H. et Movasat M.  Durant deux ans et demi, 17 cas de pneumo­thorax ont ete observes dans le service de Pedia­trie de !'Hospital Pahlavi de l'Univm-site de Teheran:  1)9 de ces malades etaient ages de moins d'un an. Le malade le plus age atteint de pn...

Background: Surgery and accurate removal of the brain tumor in the operating room and after opening the scalp is one of the major challenges for neurosurgeons due to the removal of skull pressure and displacement and deformation of the brain tissue. This displacement of the brain changes the location of the tumor relative to the MR image taken preoperatively. Methods: This study, which is done...

Ultrasound is a widely used medical imaging technique used for diagnostic purposes. But the major problem with these images is that they are inherently corrupted by speckle. The presence of speckle severely hampers the interpretation and analysis of medical ultrasonic images. In this paper, a comparison of various speckle reducing spatial and wavelet based methods has been carried out while de-...