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Lung Scanning With Colloidal RISA^1,2,3,

Ann Arbor, Michigan

ABSTRACT

The use of colloidal RISA injected intravenously in a particle size of 10–50 microns followed by lung photoscanning offers a practical, atraumatic method of visualizing pulmonary artery occlusions in the dog. The fact that the particles have a relatively short biological half-life appears to decrease the radiation dose delivered and the duration of occlusion of pulmonary capillaries as compared to ceramic microspheres. Work is in progress to apply this technique to the study of pulmonary artery occlusion in the human.

FOOTNOTES

¹ From the Departments of Internal Medicine (Nuclear Medicine Unit) and Thoracic Surgery, the University of Michigan.

² Aided by grants from the Michigan Memorial Phoenix Project #242 and the U.S.P.H.S. HE-08069-01.

³ Presented in part at the Central Chapter Meeting of the Society of Nuclear Medicine, October 20, 1963, Ann Arbor, Michigan.

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