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At least 235 records · Page 13Linked to original sources
PubMed1977

A hardware device for recognition of P and QRS waves.

A new hardware device has been constructed to detect QRS and P complexes for the purpose of automatic arrhythmia interpretation. This apparatus can operate in noisy conditions and provide synchronized pulses representative of P complex, QRS complex, wide QRS, and premature QRS to different output channels. P wave identification is achieved with a high degree of reliability through a specially designed bipolar electrode catheter. The device could minimize demands on central processor time and core storage computer.

Arrhythmias, Cardiac↗
PubMed1999

CARDIOMEDIA: a communicable multimedia medical record on Intranet and digital optical memory card.

As part of French health reform, French physicians were computerised by the end of 1998. A specific Intranet network will be used to communicate medical data between the health professionals. The objectives of the CARDIOMEDIA project were to develop and evaluate the feasibility of a coronary multimedia data record stored on an optical card and communicable on Intranet within the hospital. Patients treated by angioplasty at the University Hospital of Rennes participated in the experiment. In general, patients are treated in the University Hospital and are followed up by another health care provider closer to their home. The patient leaves the University Hospital with his card, which is directly available elsewhere for emergency or for consultation. This approach is assumed to reduce the number of examinations and to offer a better patient follow-up. The CARDIOMEDIA card is a specialised record including various data types: text, images, image sequences of coronarography and ECG signals. For this purpose an optical card with its large memory is very convenient. We used the DICOM format for image exchange and management. It is combined with CARDIOMEDIA specific compressing software. For the multimedia record the HTML format and web Intranet method are chosen. This provides an intuitive interface which can combine various data types and helper applications like a DICOM image viewer.

Angioplasty↗
PubMed1984

Computer-aided communication device for a child with cerebral palsy.

This paper describes a portable computer-aided communication device designed for a 13-year-old child with athetoid cerebral palsy. The device was intended to provide vocal output, hard-copy, correctable display, word storage capabilities, and utilize currently available technology. The design incorporated the Epson HX-20 computer, the Votrax Type 'N Talk speech synthesizer, and a customized laptray.

Adolescent↗
PubMed2004

Quality control and automation in cervical cytology.

Pap smear is a clinical screening test and does not have 100% sensitivity and specificity. Sensitivity of pap smear can be improved with proper collection techniques and education of all concerned. Implementation and maintenance of quality control measures help to detect, reduce and correct deficiencies in pap smear analysis. Advent of automated devices has provided an opportunity to further improve the sensitivity of pap smear. Automation in cytology, seemed wildly speculative a decade ago, is becoming a reality now. Areas of automation include: Data storage and retrieval by computers, automatic staining and coverslipping machines, sample preparation methods, screening process control-devices and imaging systems for searching and interpretation of abnormal cells.

Automation↗
PubMed1988

A critical investigation of the measurement of the force required to dilate the human uterine cervix.

A system for objectively analysing the forces of dilation of the human uterine cervix was devised using a force sensing device linked to a BBC microcomputer. The computer program allowed easy recording, storage and analysis of force/time curves obtained from the passage of tapered dilators through the cervix. A new design of dilator gave a smoother force/time curve. These force/time curves were analysed. Six indices: peak force, end force, area to peak, area to end the ratio of the peak and end forces recorded from the passage of the two largest and two smallest dilators, were compared. Area measurement was subject to artefact and rejected. Peak and end force measurements gave the best separation between parous and nulliparous patients. The peak force was judged to be the better as it was found to be easier to define than end force.

Biophysical Phenomena↗
PubMed2001

What, when and how to back up your data.

This article defines and describes the process of backing up data files, which should be undertaken by anyone who routinely uses a computer. The important points to be considered when developing a backup strategy are explained and a résumé given of the backup devices currently available.

Compact Disks↗
PubMed1994

Drawing two conclusions on pen computers.

In a modern version of David and Goliath, backers of hand-held pen computers hope to make serious inroads against well-established computer workstations. A start-up company, Practice Technology Inc., wants to build information networks based on pen computing. But it's going up against well-established network vendors that are relying on PC-based systems. Meanwhile, two pen computer manufacturers have stopped producing those devices, citing lack of demand.

Industry↗
PubMed2001

What Digital Imaging and Communication in Medicine (DICOM) could look like in common object request broker (CORBA) and extensible markup language (XML).

Common object request broker architecture (CORBA) is a method for invoking distributed objects across a network. There has been some activity in applying this software technology to Digital Imaging and Communications in Medicine (DICOM), but no documented demonstration of how this would actually work. We report a CORBA demonstration that is functionally equivalent and in some ways superior to the DICOM communication protocol. In addition, in and outside of medicine, there is great interest in the use of extensible markup language (XML) to provide interoperation between databases. An example implementation of the DICOM data structure in XML will also be demonstrated. Using Visibroker ORB from Inprise (Scotts Valley, CA), a test bed was developed to simulate the principle DICOM operations: store, query, and retrieve (SQR). SQR is the most common interaction between a modality device application entity (AE) such as a computed tomography (CT) scanner, and a storage component, as well as between a storage component and a workstation. The storage of a CT study by invoking one of several storage objects residing on a network was simulated and demonstrated. In addition, XML database descriptors were used to facilitate the transfer of DICOM header information between independent databases. CORBA is demonstrated to have great potential for the next version of DICOM. It can provide redundant protection against single points of failure. XML appears to be an excellent method of providing interaction between separate databases managing the DICOM information object model, and may therefore eliminate the common use of proprietary client-server databases in commercial implementations of picture archiving and communication systems (PACS).

Computer Communication Networks↗
PubMed1994

IS & C system and file protection mechanism.

This paper reports a new extension of IS & C (Image Save And Carry) project. Because IS & C is an off-line system and requires full compatibility so as to enable medical data interchange with ease among hospitals and clinics, specifications that are indispensable for compatibility have been standardized by the IS & C committee. The IS & C system is supposed to be used in medicine, so the file protection mechanism for the security of the recorded files has been also developed. The characteristics of IS & C volume and file structure and the second national project being carried out in National Cancer Center Hospital are briefly explained as well.

Computer Communication Networks↗
PubMedDate not supplied

Digital image storage.

Explore the source record for details and available documents.

Analog-Digital Conversion↗
PubMed1993

An introduction to fractal imaging technology.

In this article the author explains the basic theory and practical applications of the latest advancement in imaging technology called fractal imaging. Fractal imaging is a unique way of compressing and storing images which has unlocked the door to the restrictions imposed by conventional imaging technology as regards storage and transmission of high quality images. The article outlines how this technology has been successfully applied by the creation of the first and only fractal photographic archival and retrieval system in Scotland, in the form of the George Washington Wilson collection comprising 44,000 images and associated text in only 450 megabytes (Mb) of disc space.

Fractals↗
PubMed2001

Feasibility and clinical value of "intelligent" compression and digital storage of transthoracic echocardiograms in day-to-day practice.

BACKGROUND: The aim of this study was to assess the clinical concordance of expert cardiologists' interpretation of echocardiographic studies recorded on Super-VHS videotape or stored in magneto-optical disk, as well as the feasibility and clinical value of intelligent compression and digital storage of echocardiographic data as cine-loops and still-frames for interpretation of transthoracic echocardiographic images in clinical practice. METHODS: All clinical cardiologists experienced in echocardiography in our department (n = 10) reported on a standardized worksheet checklist the echocardiographic data of 7 consecutive patients (140 reports), and recorded them on videotape or magneto-optical disks to compare the interpretation of videotaped studies, acquired in the usual way, with clinically compressed studies stored to magneto-optical disks using a standard (Italian Society of Echocardiography) image acquisition protocol. RESULTS: The time interval between analog and digital study readings was 50 +/- 15 days. Except for tricuspid valve regurgitation grading (k = 0.28) and for left ventricular global hypokinesia (k = 0.32), the intraobserver agreement in the interpretation of the 3290 cardiovascular morphological and functional findings found on analog and digitally stored images was good (k value ranging from 0.66 to 1.00). The wall motion score index was 1.56 +/- 0.53 when interpreting analog studies, and 1.52 +/- 0.54 on digital studies (p = 0.35). Conversely, the interobserver variability of the wall motion score index (Gini index ranging from 0 to 0.80) was significantly lower when interpreting studies stored digitally than when analog ones were examined (0.48 +/- 0.021 and 0.52 +/- 0.023 respectively, p = 0.006). In comparison to videotape recordings, digital storage of echocardiographic studies significantly shortened the time to image access for study review (327 +/- 62 and 30 +/- 4 s, respectively, p < 0.0001) and the reading time (600 +/- 300 and 540 +/- 300 s respectively, p = 0.034), rendered study accessibility easier (difficult or good: 73 vs 43% of observers, fast or optimal: 27 vs 57% of observers respectively, p = 0.0011) and improved the recorded image quality perception (poor: 25 vs 10% of observers, sufficient or good: 75 vs 90% of observers respectively, p = 0.022), without loss of study completeness (insufficient: 18 vs 17% of observers, adequate or complete: 82 vs 83% of observers, respectively; p = NS). Finally, from September 1, 1999, digital storage has become routine practice for patients admitted to our Department. By December 31, 1999, 411 echo studies had been stored: 7 +/- 3 cine-loop/study, 32 +/- 18 frames/cine-loop, and 3 +/- 2 still-frames/study. The average amount of memory needed for storage was 18.6 +/- 11.9 MB/study. CONCLUSIONS: Clinical compression of echocardiographic studies seems to be an accurate summary of the complete examination recorded to videotape for the assessment of patients admitted in the coronary care unit. In addition, digitally stored studies allow a significant improvement in the interobserver reproducibility of wall motion score assessment.

Analog-Digital Conversion↗
PubMed1989

Uses and limitations of microcomputers for epidemiological research in occupational health.

The rapid improvements in microcomputer systems have contributed to ease of performance of epidemiological research in occupational health. Computers now available can aid in all stages of research- from the early stages of literature review to data collection, analysis and presentation. Optical storage devices now allow large occupational health data bases to be stored on a single compact disc, with the information accessible by microcomputer. Hand-held computers and optical scanners allow paperless collection of field data. Epidemiological analysis and data presentation is easily done with software packages, some of which are in the public domain. However, there are limitations in the use of computers for any epidemiological research. Investment of time is required to learn the use of a computer. Care needs to be taken to ensure accurate data entry, and correct choice has to be made of methods for subsequent statistical analysis. Microcomputers are valuable as labour saving devices, but cannot replace proper planning, execution and appropriate data analysis in epidemiological research in occupational health.

Health Services Research↗
PubMedDate not supplied

Present status and performance of PACS at Kyoto University Hospital.

A pilot PACS project, named KIDS, has been running in Kyoto University Hospital. The purpose of the system is to establish a small PACS that includes all digital imaging modalities and to evaluate it. The project has been continued from the first phase (KIDS-1) to the second phase (KIDS-2). In the first phase, a small-scale PACS was developed. In the second phase, the expansion of coverage of modalities and completion of the image database was intended. At present, the database contains image data of 16264 patients amounting to 150 Gbytes. Simulation of the retrieval process to the database shows that 154.3 s per patient is required for retrieving his/her entire image data. This calculated value is close to the actual time.

Computer Communication Networks↗
PubMed2003

Dissipationless quantum spin current at room temperature.

Although microscopic laws of physics are invariant under the reversal of the arrow of time, the transport of energy and information in most devices is an irreversible process. It is this irreversibility that leads to intrinsic dissipations in electronic devices and limits the possibility of quantum computation. We theoretically predict that the electric field can induce a substantial amount of dissipationless quantum spin current at room temperature, in hole-doped semiconductors such as Si, Ge, and GaAs. On the basis of a generalization of the quantum Hall effect, the predicted effect leads to efficient spin injection without the need for metallic ferromagnets. Principles found here could enable quantum spintronic devices with integrated information processing and storage units, operating with low power consumption and performing reversible quantum computation.

Journal Article↗