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At least 37 records · Page 2Linked to original sources
PubMed1997

A real-time method for generating random-dot motion displays of specified coherence.

A method that allows the creation of moving random-dot patterns with any desired level of motion coherence is presented. In the present context, a random-dot pattern with 100% coherence is a sliding sheet of dots (all dots move at the same speed and in the same direction). A random-dot pattern with 0% coherence is visual dynamic noise (similar to detuned TV snow). Coherences between 100% and 0% have a specific percentage of the dots moving coherently together, while the remaining 'twinkle' in a random fashion. The use of look-up table animation allows the dot patterns to move smoothly and rapidly even on computers that lack computational speed. Additionally, the coherence of the motion in a particular region of the screen is determined by the spatial arrangement of pixel indices in that local region. Therefore, this technique allows different regions of the screen to have different levels of coherence which makes the creation of motion-defined shapes straightforward. The basics of look-up table animation are discussed and a general algorithm for creating motion with any level of coherence is presented.

Algorithms↗
PubMed2001

Image management in dentistry.

Dentistry has seen a significant increase in the number of digital imaging technologies that have become commercially available during the past year. Computers, digital still cameras, scanners, intraoral cameras, digital X-ray systems, and their associated imaging software are all positioned at the top of the list of technologies that dentists plan to purchase within the next 12 months. This article provides an overview of the principles of image management in the dental office with an emphasis on hardware and software requirements as well as practical applications that a properly implemented image management system can afford the modern dental office.

Computer Storage Devices↗
PubMed2002

[The application of CY7C09449 in interface between DSP and the PCI bus].

Objective. To introduce the usage of CY7C09449 in the interface between DSP and the PCI bus. Method. The function of a system using CY7C09449 was introduced. Result. The data transmission between PCI bus and DSP was realized. It is proved that the maximum data rate reaches 65Mb/s. Conclusion. It is showed convenient to realize the connection to DSP with CY7C09449 [correction of EY7C09449] and the peripheral circuits is simple.

Computer Peripherals↗
PubMed1992

Literature databases for radiologists.

There are two new computerized radiology literature databases available for those practitioners who require a more sophisticated retrieval system than the Index to Imaging Literature published annually by Radiology. The installation and use of these two products, the floppy disk based PC MASS and the CD-ROM based SilverPlatter Radiology are discussed. The advantages and disadvantages of both desktop programs are compared with the Index and to the telecommunication access of large general medical databases such as MEDLINE.

CD-ROM↗
PubMedDate not supplied

[Filing and processing systems of ultrasonic images in personal computers].

The paper covers the software pattern for the ultrasonic image filing and processing system. The system records images on a computer display in real time or still, processes them by local filtration techniques, makes different measurements and stores the findings in the graphic database. It is stressed that the database should be implemented as a network version.

Computer Communication Networks↗
PubMed1995

Deciding among interactive multimedia technologies.

The history of multimedia technology is reviewed briefly as are some current health science applications. Multimedia hardware and software are discussed. Cost and benefits of current interactive multimedia technologies are assessed and key factors affecting their successful application are identified and described.

Artificial Intelligence↗
PubMed2003

Scalability simulations for nanomemory systems integrated on the molecular scale.

Simulations were performed to assess the prospective performance of a 16 Kbit nanowire-based electronic nanomemory system. Commercial off-the-shelf microcomputer system modeling software was applied to evaluate the operation of an ultra-dense storage array. This array consists of demonstrated experimental non-volatile nanowire diode switches, plus encoder-decoder structures consisting of demonstrated experimental nanowire-based nanotransistors, with nanowire interconnects among all the switching devices. The results of these simulations suggest that a nanomemory of this type can be operated successfully at a density of 10(11) bits/cm(2). Furthermore, modest device alterations and system design alternatives are suggested that might improve the performance and the scalability of the nanomemory array. These simulations represent early steps toward the development of a simulation-based methodology to guide nanoelectronic system design in a manner analogous to the way such methodologies are used to guide microelectronic system design in the silicon industry.

Computer Simulation↗
PubMed2004

A microcontroller-based portable electrocardiograph recorder.

We describe a low cost portable Holter design that can be implemented with off-the-shelf components. The recorder is battery powered and includes a graphical display and keyboard. The recorder is capable of acquiring up to 48 hours of continuous electrocardiogram data at a sample rate of up to 250 Hz.

Amplifiers, Electronic↗
PubMed1993

Displaying radiologic images on personal computers: image storage and compression: Part 1.

This is the third article of our series for radiologists and imaging scientists on displaying, manipulating, and analyzing radiologic images on personal computers. Part 1 of this article discusses image storage and reviews the basic concepts of information theory and image compression; part 2 will discuss specific methods of image compression. There are a wide variety of removable storage devices available to users who need to archive radiologic images on their personal computers. Tape drives have potentially very large storage capacity but slow performance. Removable SyQuest (SyQuest Technology, Femont, CA) and Bernoulli disks have near hard disk performance and can store from 100 to 150 Mbytes. Magneto-optical drives can store nearly 1 Gb on a 5.25" disk, with somewhat slower performance. Selecting the most appropriate storage solution requires a careful balance of the user's requirements, including performance, storage needs, cost and compatibility with other users. Despite the advances in low cost high capacity storage technology, image compression remains a crucial technology for modern diagnostic radiology because digital images require such large amounts of storage. Image compression is possible because radiologic images have relatively low entropy (high information content) compared with random noise. Image compression is classified as lossless (nondestructive) or lossy (destructive). Lossless image compression commonly achieve compression ratios of 1.5:1 to 3:1 (33% to 67%), whereas lossy compression can compresses images from 3:1 to 30:1 (67% to 97%).(ABSTRACT TRUNCATED AT 250 WORDS)

Computer Storage Devices↗
PubMed2003

CD/DVD technology.

For storage of large amounts of data, there are many options to consider, including both CD and DVD methods. Given that these are now becoming very cheap alternatives, and that we work in a specialty which generates large volumes of digital data, it is now obvious why CD and DVD burning is of interest to radiologists. These technologies can most assuredly be of great benefit to both our professional and personal lives.

CD-ROM↗
PubMed2002

Storage and distribution of pathology digital images using integrated web-based viewing systems.

CONTEXT: Health care providers have expressed increasing interest in incorporating digital images of gross pathology specimens and photomicrographs in routine pathology reports. OBJECTIVE: To describe the multiple technical and logistical challenges involved in the integration of the various components needed for the development of a system for integrated Web-based viewing, storage, and distribution of digital images in a large health system. DESIGN: An Oracle version 8.1.6 database was developed to store, index, and deploy pathology digital photographs via our Intranet. The database allows for retrieval of images by patient demographics or by SNOMED code information. SETTING: The Intranet of a large health system accessible from multiple computers located within the medical center and at distant private physician offices. RESULTS: The images can be viewed using any of the workstations of the health system that have authorized access to our Intranet, using a standard browser or a browser configured with an external viewer or inexpensive plug-in software, such as Prizm 2.0. The images can be printed on paper or transferred to film using a digital film recorder. Digital images can also be displayed at pathology conferences by using wireless local area network (LAN) and secure remote technologies. CONCLUSIONS: The standardization of technologies and the adoption of a Web interface for all our computer systems allows us to distribute digital images from a pathology database to a potentially large group of users distributed in multiple locations throughout a large medical center.

Computer Storage Devices↗