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January 5, 1918, Vol 70, No. 1 >
ARTICLE | January 5, 1918

ROENTGEN LOCALIZATION OF FOREIGN BODIES

Sinclair Tousey, M.D.
JAMA. 1918;70(1):50. doi:10.1001/jama.1918.02600010048024.
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ABSTRACT

To the Editor:  —In The Journal, Dec. 1, 1917, p. 1902, there is a letter from Dr. George C. Johnston regarding my method of locating bullets and other foreign bodies (The Journal, Nov. 3, 1917, p. 1521) by means of a wire net laid on the roentgen-ray plate during the two exposures. There are seven meshes to the linear inch. With a tube distance of 21 inches and a tube displacement of 3 inches, suitable for the head, thigh or trunk (or 14 inches distance and 2 inches displacement for thinner parts), my statement was that each one-seventh inch subdivision that the image is displaced represents one-half inch distance from the foreign body to the plate. Dr. Johnston calls attention to the necessity for a correction at most distances, and I am very glad to verify his statement. The value of my method will be greatly enhanced by the use

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