. The American journal of roentgenology, radium therapy and nuclear medicine . e involves only a small expendi-ture of time and prevents all possibilityof mistake. In conclusion I beg to thank you. , for kindly pubHshing these notesand trust that some of the suggestionsmade herein may be of use to my Ameri-can friends. AN INSTRUMENT FOR RAPID FLUOROSCOPIC FOREIGN- BODY LOCALIZATION BY COMBINED PARALLAX AND DOUBLE RING METHODS * BY EDWARD S. BLAINE, Captain, Medical Reserve Corps, U. S. Army NEW YORK IN THIS presentation the author ex-pressly disavows any claim to thediscovery of
. The American journal of roentgenology, radium therapy and nuclear medicine . e involves only a small expendi-ture of time and prevents all possibilityof mistake. In conclusion I beg to thank you. , for kindly pubHshing these notesand trust that some of the suggestionsmade herein may be of use to my Ameri-can friends. AN INSTRUMENT FOR RAPID FLUOROSCOPIC FOREIGN- BODY LOCALIZATION BY COMBINED PARALLAX AND DOUBLE RING METHODS * BY EDWARD S. BLAINE, Captain, Medical Reserve Corps, U. S. Army NEW YORK IN THIS presentation the author ex-pressly disavows any claim to thediscovery of a new method of projectilelocalization. Historically it is a fact thatthe parallax method was one of the veryfirst to be proposed after the discovery of before the danger of such a proceeding wasknown and is absolutely not to be con-sidered at this day. The earliest use ofthe double-ring principle appears to havebeen made by Redner, who fastened smallpieces of metal on the skin at the points /ti?if iiyiumiiiuMiiniii»nDi&.\ jt tr,^^>JHIDJI!lillIlllI^lBi::rr:<^jfl. Fig. I. Instrument for Use with the ParallaxAND Ring Method. the x-ray in 1895, and the double ringfollowed shortly after, as will be verifiedby a visit to the archives of this, the parallax methodhas been discovered many times in 1896 made use of the par-allax principle in the determination of thedepth of a projectile by the simple maneu-ver of introducing his hand under thevertical fluoroscopic screen and moving afinger forward and backward until it wasat the same distance from the screen asthe foreign body. This, of course, was of inlet and outlet of the x-ray beam as itpassed through the projectile. Rosenthaldevised a handle with a ring which hadan inker in its center while Angerer useda similar device, two such rings, how-ever, being used. Exner combined thedouble-ring method with the triangulationmethod and later used the parallax in placeof triangulation. From
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