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J C Buckland-Wright

Publications and source records attributed to J C Buckland-Wright.

59 records · Page 4Linked to original sources
PubMed1976

The micro-focal x-ray unit and its application to bio-medical research.

The micro-focal X-ray unit is a modified Cosslett and Nixon X-ray microscope of greater operational stability and flexibility. Its combination with a closed circuit television system provides a quick method of obtaining a point source of X-rays to examine the detailed structure of organs and biological specimens.

Microscopy↗
PubMedDate not supplied

A robust and accurate method for calculating the fractal signature of texture in macroradiographs of osteoarthritic knees.

In osteoarthritis of the knee, horizontal trabeculae in the tibia thicken, leading to the appearance of horizontal striations on radiographs. Any attempt to understand and monitor the disease process must examine these changes. We have previously described a method of analysing the texture in these images that uses the mathematical morphology operations of dilation and erosion to calculate how image fractal dimension varies with resolution. This variation with resolution is the fractal signature. Calculation of fractal dimension should be independent of linear transformations in image values, and it is shown that careful choice of morphological structuring element is required for this. In this paper we describe the dependence of our method of calculating the fractal signature on image acquisition and digitization parameters. Errors due to variations in pixel size, X-ray exposure, and patient repositioning are small compared to the changes seen in the signature due to osteoarthritic change. Using pairs of orthogonal structuring elements, one tuned to calculate the signature due to horizontal image structure and the other for vertical image structure, texture directionality is examined. The difference between the two resulting signatures in individual knees is shown to be a measure of the change in texture seen in osteoarthritis.

Algorithms↗