Picture Archiving and Communication Systems (PACS) have been widely deployed in healthcare institutions, and they now constitute
a normal commodity for practitioners. However, its installation, maintenance, and utilization are still a burden due to their
heavy structures, typically supported by centralized computational solutions. In this paper, we present Dicoogle, a PACS archive
supported by a document-based indexing system and by peer-to-peer (P2P) protocols. Replacing the traditional database storage
(RDBMS) by a documental organization permits gathering and indexing data from file-based repositories, which allows searching
the archive through free text queries. As a direct result of this strategy, more information can be extracted from medical
imaging repositories, which clearly increases flexibility when compared with current query and retrieval DICOM services. The
inclusion of P2P features allows PACS internetworking without the need for a central management framework. Moreover, Dicoogle
is easy to install, manage, and use, and it maintains full interoperability with standard DICOM services. 相似文献
Advanced digital imaging technology in medical domain demands efficient and effective DICOM image compression for progressive image transmission and picture archival. Here a compression system, which incorporates sensitivities of HVS coded with SPIHT quantization, is discussed. The weighting factors derived from luminance CSF are used to transform the wavelet subband coefficients to reflect characteristics of HVS in best possible manner. Mannos et al. and Daly HVS models have been used and results are compared. To evaluate the performance, Eskicioglu chart metric is considered. Experiment is done on both Monochrome and Color Dicom images of MRI, CT, OT, and CR, natural and benchmark images. Reconstructed image through our technique showed improvement in visual quality and Eskicioglu chart metric at same compression ratios. Also the Daly HVS model based compression shows better performance perceptually and quantitatively when compared to Mannos et el. model. Further "bior4.4" wavelet filter provides better results than "db9" filter for this compression system. Results give strong evidence that under common boundary conditions; our technique achieves competitive visual quality, compression ratio and coding/decoding time, when compared with jpeg2000 (kakadu). 相似文献
The implementation of digital radiography in dentistry in a large healthcare enterprise setting is discussed. A distinct need
for a dedicated dental picture archiving and communication systems (PACS) exists for seamless integration of different vendor
products across the system. Complex issues are contended with as each clinical department migrated to a digital environment
with unique needs and workflow patterns. The University of Florida has had a dental PACS installed over 2 years ago. This
paper describes the process of conversion from film-based imaging from the planning stages through clinical implementation.
Dentistry poses many unique challenges as it strives to achieve better integration with systems primarily designed for imaging;
however, the technical requirements for high-resolution image capture in dentistry far exceed those in medicine, as most routine
dental diagnostic tasks are challenging. The significance of specification, evaluation, vendor selection, installation, trial
runs, training, and phased clinical implementation is emphasized. 相似文献
La révélation de l'image virtuelle obtenue par les rayons X a reposé pendant de longues années sur le film argentique, qui offrait également la possibilité de visualiser l'information pour son interprétation. De plus, il permettait de communiquer et d'archiver l'image. Cette fonction de visualisation des organes étudiés pour le diagnostic s'est peu à peu estompée avec le développement des techniques radiologiques, leur numérisation progressive à partir des années 80 et la possibilité de les analyser sur des écrans. Puis, le désir de pouvoir transmettre et d'archiver les données de l'imagerie, et par conséquent de ne plus utiliser les quatre fonctionnalités du film radiologique (révélation, interprétation, communication et archivage), est né aboutissant à la mise en place de réseaux d'images. Néanmoins, leur coût, les capacités informatiques limitées de cette époque, la maturité insuffisante des hôpitaux pour de tels systèmes et leur faible usage clinique ont conduit à des échecs ou à une diffusion limitée de ces systèmes.
Malgré tout, ce concept de communication reste d'actualité voire encore plus, avec la puissance croissante des systèmes informatiques et des outils de communication comme l'illustre la généralisation d'internet.
Le désir de mettre en réseau toutes les modalités radiologiques, de communiquer l'information radiologique sur des consoles de visualisation, de constituer un archivage du dossier patient demeure donc intact, malgré ses 20 ans. Ce temps écoulé démontre les difficultés de la mise en place de ce concept dans un domaine en perpétuelle évolution tant au niveau du matériel que du logiciel.
L'objectif de cet article est de permettre la découverte de cet univers technologique pour être à même d'initier et de suivre la mise en place d'un réseau d'image. 相似文献