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British Journal of Radiology (1981) 54, 289-295
© 1981 British Institute of Radiology
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The British Journal of Radiology, Vol 54, Issue 640 289-295, Copyright © 1981 by British Institute of Radiology

ARTICLES

A method of measuring the radio-opacity of catheters

JC Gore and GR Hooker

Two methods for measuring the radio-opacity of catheters are described. An analysis of the physical quantities that are important for the satisfactory detection of a catheter inside a patient shows that an intrinsic index of radio-opacity can be defined and measured using a radiograph of a step wedge. Quantitative comparisons between catheters of different compositions may then be made, and results are presented of measurements made on several commercially available devices. It is suggested that the methods described are more satisfactory than previous techniques used to define standards, and that they highlight some anomalies in current catheter design and usage.




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Copyright © 1981 by the British Institute of Radiology.