- Email: [email protected]
A New Technique for Fluorescein Conferences
NOTES, CASES, INSTRUMENTS
A N E W T E C H N I Q U E FOR FLUORESCEIN CONFERENCES W I L L I A M C. N Y B E R G AND W I L L I A M E. B E N S O N ,
M.D.
Philadelphia, Pennsylvania
We have devised an inexpensive, timesaving technique for simultaneous pro jection of the fine detail and the progres sion of a fluorescein angiogram. For showing fine detail in positive tone, as in fluorescein projected as white (Fig ure, center), we made a film strip from the original camera negatives. The negatives were fed through a Bowens Illumitran slide copier at right angles into the body of a Nikon camera, which was loaded with a four-foot strip of Eastman finegrain, release-positive film. Before load ing the film, we marked it so that expo sures started at a known point. We adjusted magnification to give the required "half-frame" (18 x 24 mm) im age size. All the odd numbered negatives were then exposed. The camera advanced the normal "double frame" distance of eight sprocket holes between each expo sure. This left an unexposed area of one half-frame, on which the even num bered negatives were photographed. The film was then reloaded four sprocket holes (one half-frame) in advance of the mark on the film. As the film made its second trip through the camera, the even numbered negatives fell neatly on the From the Retina Service, Scheie Eye Institute, Department of Ophthalmology, University of Penn sylvania, School of Medicine, Philadelphia, Penn sylvania. Reprint requests to William E. Benson, M.D., 51 N. 39th St., Philadelphia, PA 19104.
Figure (Nyberg). A fluorescein conference. Left to right, A contact sheet of the study, the projection of the film strip, and a color slide of the fundus.
previously unexposed sections in perfect order. At the fluorescein conference, we pro jected color slides of the fundus on a white wall for reference (Figure, right). With an x-ray projector, we projected a 10 x 12-inch contact sheet of the fluores cein study on another wall to show pro gression of the study (Figure, left). Using a Kodak film strip adaptor mounted on a carousel projector, we then projected the film strip on a central screen. The film costs about 30 cents. Exposure of an entire fluorescein angiogram takes five to ten minutes. Time is saved because film strips can be developed along with original fluorescein angiography nega tives in Kodak D-19 developer. Moreover, unlike the preparation of 35-mm slides of individual fluorescein photographs, no additional time is spent selecting, mount ing, labeling, arranging, and filing. SUMMARY
We used a technique for preparing a positive tone reproduction film strip from the original negative photographs of a fluorescein angiogram. This inexpensive technique drastically reduces the prepa ration time for a fluorescein conference, without sacrificing quality projection of the fluorescein angiogram.
A N E W T E C H N I Q U E FOR FLUORESCEIN CONFERENCES W I L L I A M C. N Y B E R G AND W I L L I A M E. B E N S O N ,
M.D.
Philadelphia, Pennsylvania
We have devised an inexpensive, timesaving technique for simultaneous pro jection of the fine detail and the progres sion of a fluorescein angiogram. For showing fine detail in positive tone, as in fluorescein projected as white (Fig ure, center), we made a film strip from the original camera negatives. The negatives were fed through a Bowens Illumitran slide copier at right angles into the body of a Nikon camera, which was loaded with a four-foot strip of Eastman finegrain, release-positive film. Before load ing the film, we marked it so that expo sures started at a known point. We adjusted magnification to give the required "half-frame" (18 x 24 mm) im age size. All the odd numbered negatives were then exposed. The camera advanced the normal "double frame" distance of eight sprocket holes between each expo sure. This left an unexposed area of one half-frame, on which the even num bered negatives were photographed. The film was then reloaded four sprocket holes (one half-frame) in advance of the mark on the film. As the film made its second trip through the camera, the even numbered negatives fell neatly on the From the Retina Service, Scheie Eye Institute, Department of Ophthalmology, University of Penn sylvania, School of Medicine, Philadelphia, Penn sylvania. Reprint requests to William E. Benson, M.D., 51 N. 39th St., Philadelphia, PA 19104.
Figure (Nyberg). A fluorescein conference. Left to right, A contact sheet of the study, the projection of the film strip, and a color slide of the fundus.
previously unexposed sections in perfect order. At the fluorescein conference, we pro jected color slides of the fundus on a white wall for reference (Figure, right). With an x-ray projector, we projected a 10 x 12-inch contact sheet of the fluores cein study on another wall to show pro gression of the study (Figure, left). Using a Kodak film strip adaptor mounted on a carousel projector, we then projected the film strip on a central screen. The film costs about 30 cents. Exposure of an entire fluorescein angiogram takes five to ten minutes. Time is saved because film strips can be developed along with original fluorescein angiography nega tives in Kodak D-19 developer. Moreover, unlike the preparation of 35-mm slides of individual fluorescein photographs, no additional time is spent selecting, mount ing, labeling, arranging, and filing. SUMMARY
We used a technique for preparing a positive tone reproduction film strip from the original negative photographs of a fluorescein angiogram. This inexpensive technique drastically reduces the prepa ration time for a fluorescein conference, without sacrificing quality projection of the fluorescein angiogram.