Fast Neutron Radiography Of Standard Biological Objects

John L. Ingwersen; Stanley R. Bull

doi:10.1117/12.975327

1 June 1971 Fast Neutron Radiography Of Standard Biological Objects

John L. Ingwersen, Stanley R. Bull

Proceedings Volume 0026, Quantitative Imagery in the Biomedical Sciences I; (1971) https://doi.org/10.1117/12.975327
Event: Quantitative Imagery in the Biomedical Sciences I, 1971, Houston, United States

Abstract

The application of neutron radiography to imaging biomedical objects is in the initial stages of development. A possible application of fast neutron radiography is the imaging of air-filled cavities embedded in tissue, particularly in the vicinity of bones. A fast neutron radiography facility has been developed using an accelerator to produce 14.7 Mev neutrons by the T(d,n) reaction and a divergent collimator (six-inch-square radiograph area) in a large water tank to reduce interference fast neutrons at the image point. Test objects were constructed of plexiglass (nearly tissue equivalent) in the form of stepped slabs with holes in each step ranging from 1/32 to 1/4 inches in diameter. The objects with holes were radiographed at several distances from the film to determine the resolution capabilities of the facility. The slabs with holes were also placed behind several thicknesses of plexiglass and radiographed to demonstrate the ability to detect air-filled cavities buried in tissue. The radiographs were produced by direct exposure using a scintillator-film detector. The detail was improved by computer aided image analysis which increases the contrast, an apparent contribution in minimizing the dose levels required. The results show that cavities can be observed in configurations approximating pratical specimens.

Citation Download Citation

John L. Ingwersen and Stanley R. Bull "Fast Neutron Radiography Of Standard Biological Objects", Proc. SPIE 0026, Quantitative Imagery in the Biomedical Sciences I, (1 June 1971); https://doi.org/10.1117/12.975327

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