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K J Barnes

Publications and source records attributed to K J Barnes.

5 recordsLinked to original sources
PubMed1995

A reappraisal of current methods for the assessment of planar gamma camera performance.

This study reappraises the acquisition parameters defined by three current protocols for the specification of planar gamma camera performance. These are the manufacturer Standards of the National Electrical Manufacturers' Association [1] and the International Electrotechnical Commission [2], and the user-orientated protocol of the UK Department of Health (DoH, formerly DHSS) Gamma Camera Performance Assessment Group [3]. The study looks specifically at three major planar performance characteristics: intrinsic non-uniformity, intrinsic spatial resolution and intrinsic non-linearity (spatial distortion). Acquisition parameters specified for these characteristics are investigated by testing a range of values for each parameter around those figures currently advocated by the three protocols. Those acquisition parameters which may be relaxed without loss of data integrity are identified and the adoption of revised parameters for some measurements within the DoH assessment protocol is suggested. Reviewing the data obtained, observations are made regarding the accuracy of some tests performed regularly for quality control purposes. The feasibility and advantages of incorporating some suitably modified DoH performance assessment tests within a routine quality assurance protocol for the gamma camera are also discussed.

Gamma Cameras↗
PubMed1984

Multicenter evaluation of a 1-h enzyme-linked immunosorbent assay for rubella serology.

A 1-h enzyme-linked immunosorbent assay (Rubestat) was developed for rubella virus immunoglobulin G detection. The assay used phenolphthalein monophosphate as the substrate, which, when developed, can easily be read visually. Rubestat compared very favorably to hemagglutination inhibition and commercial enzyme-linked immunosorbent assays in its ability to determine immune status. Rubestat demonstrated greater than 97% specificity, sensitivity, and accuracy as compared with other methodologies at 10 different laboratories. The Rubestat index values were precise, with coefficients of variation for intra- and interassay variation of less than 10%. Mean index values had a linear correlation with hemagglutination inhibition titers (r2 greater than 0.97). A population distribution of index values illustrated two distinct bell-shaped curves representing the positive and negative populations. Studies of acute and convalescent serum pairs showed Rubestat to be as accurate as hemagglutination inhibition in determining seroconversion.

Antibodies, Viral↗
PubMedDate not supplied

Vitamin C status of institutionalized and non-institutionalized elderly in Central Kentucky.

A survey of 139 elderly volunteers between 60 and 90 years of age was conducted to determine their vitamin C status and to investigate possible relationships between the plasma vitamin C level, the participant's age, sex, and institutionalization status. When the participants' vitamin C levels were compared by age groups (60-70, 71-80, 81-90) and sex, no significant differences were found. Higher (P<0.01) mean total and reduced plasma vitamin C levels were found in those subjects living on their own, when compared to nursing home residents. No vitamin C deficiency levels were found in the elderly population studied, although several were considered borderline.

Journal Article↗
PubMedDate not supplied

Team collaborative practices between teachers and occupational therapists.

OBJECTIVE: A descriptive, correlational study using a survey instrument and record review was designed to describe collaboration practices between teachers and occupational therapists in public schools and to explore relationships of these practices to individual education plan (IEP) objectives and teachers' perceptions of occupational therapy contributions to student skill development. METHOD: Forty teachers of students who receive occupational therapy comprised the sample. Descriptive statistics and Spearman rank order correlations were used to describe the practices and to determine associations among the variables. RESULTS AND CONCLUSIONS: The findings indicated that teachers and occupational therapists were using collaborative team practices, such as jointly developing goals and objectives, collaboration within the classrooms, jointly monitoring interventions, and jointly reviewing student progress. However, scheduling team meetings was difficult. The majority of respondents stated that occupational therapy contributed to student skill development, and as collaboration practices increased, the teachers' perceptions of occupational therapy contribution to student skill development increased. A significant negative correlation was found between the percentage of IEP objectives met variable and three collaborative variables--team meetings, reviewing progress, and develop goals and objectives. This finding indicated that as the frequency of these team processes increased, fewer objectives were met.

Adolescent↗