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At least 19 recordsLinked to original sources
PubMed1999

Modeling computer interest in older adults: the role of age, education, computer knowledge, and computer anxiety.

We proposed a mediation model to examine the effects of age, education, computer knowledge, and computer anxiety on computer interest in older adults. We hypothesized that computer knowledge and computer anxiety would fully mediate the effects of age and education on computer interest. A sample of 330 older adults from local senior-citizen apartment buildings completed a survey that included an assessment of the constructs included in the model. Using structural equation modeling, we found that the results supported the hypothesized mediation model. In particular, the effect of computer knowledge operated on computer interest through computer anxiety. The effect of age was not fully mitigated by the other model variables, indicating the need for future research that identifies and models other correlates of age and computer interest. The most immediate application of this research is the finding that a simple 3-item instrument can be used to assess computer interest in older populations. This will help professionals plan and implement computer services in public-access settings for older adults. An additional application of this research is the information it provides for training program designers.

Age Factors↗
PubMed1993

Psychology of computer use: XXIX. Measuring computer users' stress: the Computer Hassles Scale.

Measurement of computer users' stress was based on the Computer Hassles Scale. 65 questionnaires were returned from 113 mailed to users of accounting information systems who worked for manufacturing companies. Correlations were calculated for the total sample and subsamples divided by gender. The analysis indicated that persons with college degrees experienced greater computer users' stress than those who were without. Those persons who reported more computer hassles experienced more somatic complaints which indicated that the computer hassles were stressful. There were no significant mean differences between women and men on computer hassles or somatic complaints. The correlations of computer hassles with somatic complaints differed by gender. Women's computer hassles were significantly correlated .61 with somatic complaints, but men's computer hassles were not significantly correlated (r = .18) with somatic complaints. The gender differences suggest that there is a complex relationship between stressors (computer hassles) and stress reactions (somatic complaints).

Adult↗
PubMed1997

Psychology of computer use: XLV. Cognitive spontaneity as a correlate of computer anxiety and attitudes toward computer use.

The relationship of cognitive spontaneity with measures of computer anxiety and attitudes toward computer use was investigated in a sample of 178 individuals attending advanced courses in management. As expected, a significant negative relationship between cognitive spontaneity and computer anxiety was found. The relationship remained significant even with statistical control for computer experience. The relationship between cognitive spontaneity and attitudes toward computer use was positive but not significant. The results imply both a direct and an indirect relationship between cognitive spontaneity and computer anxiety. Further, the results support the suggestion that computer anxiety and attitudes toward computer use are related but distinct constructs.

Adult↗
PubMed1996

Evaluation of soft-tissue foreign bodies: comparing conventional plain film radiography, computed radiography printed on film, and computed radiography displayed on a computer workstation.

OBJECTIVE: The study was performed to evaluate detection of soft-tissue foreign bodies using conventional radiography (film-screen radiography), computed radiography printed on films (computed radiography-hard copy), and computed radiography displayed on a computer workstation (computed radiography-soft copy). SUBJECTS AND METHODS: Fifteen foreign bodies of different size, shape, and composition were implanted at different locations in a fresh cadaveric hand, and images were obtained using three radiographic techniques. Images were evaluated by four board-certified radiologists to ascertain the conspicuity of the foreign bodies with the different techniques. A subjective grade was assigned to each image in an attempt to identify the relative conspicuity of foreign bodies when imaged with the three techniques. RESULTS: Computed radiography-soft copy is the preferred imaging technique for the detection of wood and plastic foreign bodies in soft tissue regardless of the size of the wood or the plastic. No significant differences in conspicuity among the three techniques were demonstrated with glass foreign bodies. CONCLUSION: Detection of soft-tissue foreign bodies is best done using computed radiography-soft copy instead of film-screen radiography and computed radiography-hard copy imaging.

Cadaver↗
PubMed1992

High-performance computing, high-speed networks, and configurable computing environments: progress toward fully distributed computing.

The next several years will see the maturing of a collection of technologies that will enable fully and transparently distributed computing environments. Networks will be used to configure independent computing, storage, and I/O elements into "virtual systems" that are optimal for solving a particular problem. This environment will make the most powerful computing systems those that are logically assembled from network-based components and will also make those systems available to a widespread audience. Anticipating that the necessary technology and communications infrastructure will be available in the next 3 to 5 years, we are developing and demonstrating prototype applications that test and exercise the currently available elements of this configurable environment. The Lawrence Berkeley Laboratory (LBL) Information and Computing Sciences and Research Medicine Divisions have collaborated with the Pittsburgh Supercomputer Center to demonstrate one distributed application that illuminates the issues and potential of using networks to configure virtual systems. This application allows the interactive visualization of large three-dimensional (3D) scalar fields (voxel data sets) by using a network-based configuration of heterogeneous supercomputers and workstations. The specific test case is visualization of 3D magnetic resonance imaging (MRI) data. The virtual system architecture consists of a Connection Machine-2 (CM-2) that performs surface reconstruction from the voxel data, a Cray Y-MP that renders the resulting geometric data into an image, and a workstation that provides the display of the image and the user interface for specifying the parameters for the geometry generation and 3D viewing. These three elements are configured into a virtual system by using several different network technologies. This paper reviews the current status of the software, hardware, and communications technologies that are needed to enable this configurable environment. These interdependent technologies include: (1) user interface and application program construction methodologies, (2) the interprocess communication (IPC) mechanisms used to connect the software modules of the application, (3) the network protocols and interface hardware used by the IPC for communicating between modules running on separate and independent computing system elements, (4) the telecommunications infrastructure that provides the low-level data transfer functions for the networks that connect the geographically distributed elements used by the application, and (5) the nature of the functional elements that will be connected to form virtual systems.

Computer Communication Networks↗
PubMed1999

New computing paradigms suggested by DNA computing: computing by carving.

Inspired by the experiments in the emerging area of DNA computing, a somewhat unusual type of computation strategy was recently proposed by one of us: to generate a (large) set of candidate solutions of a problem, then remove the non-solutions such that what remains is the set of solutions. This has been called a computation by carving. This idea leads both to a speculation with possible important consequences--computing non-recursively enumerable languages--and to interesting theoretical computer science (formal language) questions.

Animals↗
PubMed1995

Tracing the planned probe trajectory on axial computed tomography slices: a computation-based support for stereotactic procedures. A computational tool for tracing of probe trajectories on CT slices.

Stereotactic frames are designed to hit point-like intracranial targets. Their routine performance does not include a display of the intended transcerebral probe path. Since the latter can render stereotactic procedures safer, more accurate and versatile, it has increasingly been implemented by potent computer systems. A low-cost alternative is presented in the form of a small extension of the computation program which is usually employed for the conversion of imaging coordinates to frame adjustments. It allows any desired point on the planned probe trajectory, in terms of its distance to the target, to be defined in Cartesian coordinates and thus to be traced on computed tomography. Thus, in biopsy procedures, for instance, instead of sampling tissue at the target only or in a 'blind' serial way, samples can be collected in a previewed and therefore safer and more purposeful way, thereby improving the yield of pathological tissue. The method seems particularly interesting for institutions that have a low to moderate number of stereotactic procedures and for which the investment of sophisticated computer systems for this purpose alone would not be economically feasible.

Biopsy↗
PubMed1992

Psychology of computer use: XXVI. Computer-related stress and in-class computer usage.

Two-year college students receiving three different levels of class-based computer experiences were surveyed using Hudiburg's Computer Technology Hassles Scale. Although their academic work involved widely different types of work with computers, all groups (ns = 23, 32, and 24) appeared to perceive the same interactions with computers as unpleasant. The students selected unpleasant interactions in the same numbers and with the same intensity.

Adaptation, Psychological↗
PubMed1998

Basic computing for dental practitioners: 1. The principles of computers and computing.

The purpose of this series of six articles is to introduce the interested general dental practitioner to computers and computing, to remove much of the mystery surrounding computers and to explain the technology in straightforward terms. The first two articles will concentrate on the basic principles; later papers will discuss the most commonly used software, practice management systems and multimedia.

Computer User Training↗
PubMed1987

Computer corner #17. Computer-assisted preoperative planning (CAPP) on an office personal computer.

Determination of a preoperative plan is one of the more challenging aspects of performing corrective osteotomies for traumatic or other skeletal deformities. With the advent of sophisticated graphics hardware in personal computers, a method of preoperative planning has been developed which is less time-consuming and more versatile than conventional methods. Using OrthoPlan, radiographs are traced on a backlit, digitizing tablet attached to a microcomputer. A variety of osteotomies may be rapidly simulated on the computer screen and the surgical outcome visualized. Computer-assisted preoperative planning (CAPP) can be effectively used to decrease planning time, allow visualization of multiple surgical options, and predict results.

Bone and Bones↗
PubMed1999

The management of endodontically treated teeth using a Computer-Aided Design and Computer-Assisted Manufacturing/Computer-Aided Design and Computer-Integrated Manufacturing system.

This article introduces a new approach for restoring endodontically treated posterior teeth. Significantly reduced natural tooth structure often remains not only because of previous restorative measures but also because of endodontic procedures. Cast restorations for these teeth are almost universally recommended. The exception to this is the rare instance in which only conservative endodontic access openings exist in teeth presenting with no former existing restorations. Typically, multiple clinical appointments are required to complete the final cast restoration. This article presents Computer-Aided Design and Computer-Assisted Manufacturing/Computer-Aided Design and Computer-Integrated Manufacturing applications for restorative dentistry that provide the necessary care in an expeditious manner.

Ceramics↗
PubMed1993

Anti-CEA immunoscintigraphy might be more useful than computed tomography in the preoperative thoracic evaluation of lung cancer. A comparison between planar immunoscintigraphy, single photon emission computed tomography (SPECT), and computed tomography.

While a clinical, plain radiographic, and bronchoscopic assessment yields most of the essential information needed in lung cancer, computed tomography (CT) of the thorax provides diagnostic information previously unobtainable, potentially capable of reducing the number of explorative thoracotomies. In a few recent studies, immunoscintigraphy with anti-carcinoembryonic antigen (anti-CEA) monoclonal antibodies (MA) has shown remarkable staging potential. To compare the diagnostic accuracy of the two techniques, we photoscanned with indium-111 (111In)-labeled-F(ab')2 fragments of the murine anti-CEA MA FO23C5 45 patients, who were pathologically assessed for possible loco-regional extension of lung cancer. Both planar and single photo emission computed tomography (SPECT) images were obtained. Additionally, CT of the thorax (contiguous CT slices, 10 mm thick, from the lung apices to the upper abdomen), and other routine tests of preoperative evaluation were obtained. On the basis of 37 (N1, T3, and T4), 38 (N2), and 12 (N3) pathologically documented sites, an accuracy of 65, 76, 92, 78, and 86 percent (SPECT images), and 62, 68, 42, 78, and 84 percent (CT images) was calculated (figures are relevant to N1, N2, N3, T3, and T4 disease, respectively). Thus, both techniques shared a significant margin of error in almost all the categories of evaluation; however, immunoscintigraphy showed equivalent, and, in the lymph node assessment, superior results to CT. A marginal improvement of diagnostic accuracy was recorded combining the three techniques in one case (SPECT plus planar immunoscintigraphic images), while there was no benefit in any possible integration of CT and immunoscintigraphic images. In patients with peripheral nonsquamous cell cancers, the accuracy of anti-CEA immunoscintigraphy was of 90 percent or higher. Variations in the modality of performing immunoscintigraphy, such as changes in the dose of antibody fragments to be injected, in the percentage of radiolabeling, or in the time of imaging, affected the quality of immunoscintigraphic series, and the consequent interpretation of findings. At the present time, there are very few reliable tests capable of selecting patients to proceed directly to thoracotomy or to receive some intermediate surgical test, such as a prior mediastinoscopy. Traditionally, CT has been this type of "filter-test." If current findings will be confirmed in future studies, anti-CEA immunoscintigraphy might replace CT in the evaluation of particular subgroups of patients, such as patients with peripheral nonsquamous cell bronchogenic carcinoma.

Adult↗
PubMedDate not supplied

Detection of hepatocellular carcinoma: comparison of dynamic three-phase computed tomography images and four-phase computed tomography images using multidetector row helical computed tomography.

PURPOSE: The purpose of our study was to assess the value of additional early arterial phase computed tomography (CT) imaging in the detection of hepatocellular carcinoma (HCC) by comparing three-phase and four-phase imaging by using multidetector row helical CT. METHODS: Twenty-five patients with 33 HCCs underwent four-phase helical CT imaging. The diagnosis was established by pathologic examination after surgical resection in 19 patients and by biopsy in six. Four-phase CT imaging comprises early arterial, late arterial, portal venous, and delayed phase imaging obtained 25 seconds, 45 seconds, 75 seconds, and 180 seconds after the start of contrast material injection using multidetector row helical CT. Three-phase CT images (late arterial, portal venous, and delayed phase) and four-phase CT images (early arterial, late arterial, portal venous, and delayed phase) were interpreted independently for the detection of HCC by three blinded observers on a segment-by-segment basis. Sensitivity, specificity, and area under the receiver operating characteristic (ROC) curve (Az) for three-phase CT images and four-phase CT images were calculated. The enhancement pattern of HCC was analyzed on early arterial and late arterial phase imaging. RESULTS: The mean sensitivity of three- and four-phase CT images was 94% and 93%, respectively. The differences between sensitivities were not statistically significant (all p > 0.05). The mean specificities of three- and four-phase CT images were 99% and 98%, respectively. The differences between the specificities were not statistically significantly (all p > 0.05). Neither were the mean areas under the ROC curve for four-phase CT images (Az = 0.976) and three-phase CT images (Az = 0.971) statistically significant (p > 0.05). On early arterial phase imaging, 16 HCCs were hyperattenuating and 17 HCCs were isoattenuating. On late arterial phase imaging, 24 HCCs were hyperattenuating and nine HCCs were isoattenuating. CONCLUSIONS: Additional early arterial phase imaging did not improve the detection of HCC compared with three-phase CT images, including late arterial, portal venous, and delayed phase imaging.

Adult↗
PubMed1993

Assessment of the current computer literacy and future computer needs of emergency medicine residents and faculty.

The purpose of this study was to assess the current computer literacy and future computer needs of emergency medicine residents and faculty to aid in developing a computer literacy curriculum. All emergency medicine residents and full-time faculty from a random sample of emergency medicine residencies were mailed questionnaires assessing current computer familiarity and future computer needs. Twenty-one residencies were surveyed; 15 resident and 17 faculty questionnaires were returned. Thirty-seven percent (116 of 314) faculty and 29% (135 of 470) resident questionnaires were completed and returned. Eighty percent (12 of 15) of residencies had a designated computer for resident use; 93% (14 of 15) had a computer for use in the emergency department. Forty-seven percent of residents owned their own computer; 68% of faculty had a computer in their home, and 52% had computers in their office. Less than 30% of residents and faculty had formal computer training. Residents and faculty rated the current familiarity and future needs for various software applications on a five-point scale. Data were analyzed using the Wilcoxon-Rank Sum Test. Residents and faculty had the most anticipated need for word processing, graphics, literature searching, data base, and patient management programs. Future computer need was rated significantly higher than current computer familiarity in all computer application areas (P < or = .0002). It seems that emergency medicine residents and faculty have adequate access to computers, but minimal computer training. Residents and faculty have a high anticipated need for various basic computer applications.(ABSTRACT TRUNCATED AT 250 WORDS)

Computer Literacy↗