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Biomedical subjects

J R Phillips

Publications and source records attributed to J R Phillips.

100 records · Page 6Linked to original sources
PubMed1976

A quantitative comparison of paralleling long-cone and bisection-of-angle periapical radiography.

Quantitative data permit the variability comparison of crown-root ratios computed from periapical films of a single central incisor taken by five technicians using the bisection-of-angle and the paralleling long-cone techniques. The paralleling long-cone technique produces significantly less distortion and is less variable. It is the method of choice for assessing natural root resorption and resorption due to orthodontic therapy.

Humans↗
PubMed1975

Prediction of the strength of the neck of femur from its radiological appearance.

In this study 39 male and female cadaveric femoral necks of ages between 21 and 89 years have been radiographed and subsequently mechanically tested to determine failure load. A structural model has been developed, in an attempt to predict the failure load of specimens solely from measurements made from an anteroposterior radiograph of the neck region. Good correlation was obtained between the predicted and experimental values for the range tested. The influence of average bone porosity is discussed. It is believed that this method, with modifications will provide a basis for the quantitative assessment of femoral neck strength in the clinical situation.

Adult↗
PubMedDate not supplied

The reliability of the routine chest roentgenogram for determination of heart size based on specific ventricular chamber evaluation at postmortem.

Routine posteroanterior and lateral chest radiographs in 268 patients were analyzed to determine heart size--normal, cardiomegaly, or specific chamber enlargement--using specified radiographic criteria for enlargement. The accuracy of this determination was compared with a specific ventricular mass derived from a postmortem cardiac chamber partition technique. The data indicate that in the majority of cases (greater than 70%) a normal-sized heart or cardiomegaly can be correctly determined from the chest x-ray either by the subjective criteria of chamber enlargement or by measurement of the transverse diameter. The use of the chest x-ray, however, for evaluation of specific ventricular chamber enlargement is a less accurate determination, and results are compromised.

Adult↗