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To the Editor.—
The author of "Three Dimensional Time Sequence Roentgenography" (217:322, 1971) is apparently unaware of my previous publication, "Precision Stereoscopic Movies for Anatomical and Surgical Teaching" which was presented at the Seventh National Instrument Society of America Symposium, May 19 to 21, 1969, at Ann Arbor, Mich, and was published in the ISA volume, Imagery in Medicine.The first method developed by me used split frames and is not suitable for X-ray movies without extensive processing. The second method is unique since it can be used to project stereoscopic movies from any film ever made as long as motion is present. Astounding as this statement may be, it is true, because even with a stationary camera, as long as the subject being photographed is in motion, then frame 1 bears stereo information relative to frame 2 and frame 2 to frame 3 etc. The projector must be
Esmond WG. 3D Roentgenographic Movies. JAMA. 1971;218(4):598. doi:10.1001/jama.1971.03190170076036