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Biomedical subjects

H B Bentley

Publications and source records attributed to H B Bentley.

At least 19 recordsLinked to original sources
PubMed1999

A local congenital anomalies register: monitoring preventive interventions.

BACKGROUND: There is need for good quality data on congenital anomalies for monitoring (1) interventions for primary prevention and (2) prenatal diagnosis with advice on termination of affected pregnancies. METHOD: A register was compiled of congenital anomalies arising among births to Leeds residents in an 18 month period (13,596) and terminations (3015) in a related pregnancy cohort. Multiple sources of ascertainment were used and the full range of structural anomalies was included. RESULTS: The total incidence of anomalies (excluding spontaneous abortions) was 1.31 per cent. Incidence rates for the major categories are reported and compared with birth prevalence rates from British studies in the 1950-1960s. It was found that 31.3 per cent of the known anomalies were aborted; 2.26 per cent of the legal abortions were for a congenital anomaly. The overall birth prevalence rate was 1.10 per cent. Neural tube defects are used as an example of the use of a local congenital anomalies register in auditing preventive measures. CONCLUSION: A local congenital anomalies register is a valuable instrument in monitoring the impact of preventive measures, but it should include data on legal terminations as well as cases detected at birth and subsequently.

Abortion, Induced↗
PubMed1991

Reliability of the acetabular teardrop as a landmark.

This study investigated the effect of tilt and observer reliability on radiographic measurements of the position of a prosthetic acetabular cup in seven dry bone pelves using the teardrop as a landmark. Coronal or sagittal tilt of more than five degrees was easily recognisable and there was effectively no observer variation in the measurements up to this limit. In addition, 90 out of 100 randomly selected antero-posterior pelvic radiographs from an outpatient department were not significantly rotated and 93 demonstrated a clearly defined teardrop. Measurements about the teardrop on routine radiographs are therefore sufficiently accurate to allow assessment of prosthetic position.

Acetabulum↗
PubMed1989

Quantification of bone density and mineral content.

To summarise, densitometry is used for measuring trabecular bone sites and morphometry for measuring cortical bone sites. Simple morphometry is still a very useful method of estimating bone loss. In sequential studies sophisticated techniques are now available, linked with computer analysis.

Absorptiometry, Photon↗
PubMed1983

Homo sapiens radiographica.

This paper is intended to outline the sociological, educational and psychological background of the radiographer. It traces the development through to the final product--homo sapiens radiographica (with apologies to the more pedantic scholars of Latin).

Educational Status↗
PubMed1979

Effects of rotation on radiographic dimensions of metacarpals.

An experiment is described which shows that small rotations of metacarpals about their long axes produce small systemmatic changes in the cortical dimensions as measured by radiographic morphometry. The effect is of no significance in cross-sectional studies but is an important source of error in sequential studies.

Anthropometry↗
PubMed1977

Effect of rotation on radiographic dimensions of the humerus and femur.

Ten humeri and ten femora were radiographed in nine positions of longitudinal rotation. In each position total, medullary and cortical widths of the diaphyses (TW, MW, CW) were measured to assess the effect of rotation on these dimensions. The results were expressed as differences from the values in the neutral position (delta TW, delta MW, delta CW). In the humerus, medial rotation produced greater changes than lateral rotation. Though rotation in either direction increased CW, the systematic error due to medial rotation to only 5 degrees (approximately +0.0058 cm per degree) was more than double that due to lateral rotation. In the femur, lateral rotation had the greater effect, producing a marked decrease in CW (approximately -0.0072 cm per degree). Medial rotation produced only a slight increase in CW. The ratios CW/TW ("cortical index") and CA/TA ("area ratio") were calculated and expressed as differences from the values in the neutral position (delta CW/TW, delta CA/TA). Rotation affected these variables much less than the linear dimensions. Furthermore, through the variance of delta TW, delta MW and delta CA/TA increased only slightly or not at all. These results suggest that if radiographic morphometry is to be applied to the humerus and femur, these ratios rather than transverse dimensions should be used. Sequential changes in CW may be totally obscured by small rotational errors.

Anthropometry↗
PubMed1976

An analysis of career enquiries made to a school of radiography over a five-year period.

A follow-up enquiry form is described and results provided from a survey over a five-year period. The information gained has enabled a further and we hope more searching questionnaire to be designed. At the time of producing the pro-forma in 1969, career and salary prospects in radiography were not as good as at present. The Halsbury Report in May 1974 was a great advantage to the paramedical professions as a whole. It will be interesting to see how recruitment and job availability proceed over the ensuing five years.

Allied Health Personnel↗