United States Army X-ray manual / authorized by the Surgeon-General of the Army ; prepared under the direction of the Division of Roentgenology.
- Date:
- 1920
Licence: Public Domain Mark
Credit: United States Army X-ray manual / authorized by the Surgeon-General of the Army ; prepared under the direction of the Division of Roentgenology. Source: Wellcome Collection.
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![As a general guide in starting work, a uniform rather high gap may be used—say 5 inches, and a uniform tar- eet-plate distance—say 20 inches, except for chest, where 28 inches is advised. With all this understood, the average of reports from many sources gives the following table for a patient of about 150 pounds weight and a Seed x-ray plate. Some people prefer a shorter gap for most work |[p-a head work excepted], and certainly with the ordinary solid tungsten target, medium focus Coolidge tube, better negatives result from proper exposure on a four-inch gap than on a five-inch one; this will require about 50 per cent increase in time of exposure for the same distance and current. Part Time: see. Head, A-P 12 Head, Lat. 6 Neck 3 Shoulder 314 Elbow 11, Alt exposures on 5” gap, Wrist 1 40 ma. 20” distance ex- Kidney 3—d cept chest, which is at Bladder 3—d 28”, Hip joint oS—T Pelvis o—T Knee 2 Ankle 114 Lumbar spine 5—6 Teeth (slow film) 4 Teeth (fast film) 11% mChest (at 28”) 24 Notrres: (a) For parts above average thickness, increase time considerably more than in proportion to increase of thickness.](https://iiif.wellcomecollection.org/image/b32185546_0115.jp2/full/800%2C/0/default.jpg)
