File:American quarterly of roentgenology (1911) (14756923925).jpg

Identifier: americanquarterl03amer (find matches)
Title: American quarterly of roentgenology
Year: 1911 (1910s)
Authors: American Roentgen Ray Society
Subjects: Nuclear Medicine Radiography Radiology Radiology
Publisher: Pittsburgh : American Roentgen Ray Society
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and the National Endowment for the Humanities

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can be used inthe hand stereoscope or desire to reproduce plates for pub-lication. Also if we wish to make our exposures one like theother, it is necessary to ascertain closely the principal raybefore exposure. The latter is easily found by having a pointer that can pro-ject from the center of the diaphragm before exposure andeasily be removed. The former I have accomplished by hav-ing two perpendicular steel rods (previously described)pointing up from: the top of the table on either side of thepatients neck. The shadow falling from these uprights, aslong as they are in a plane with the principal ray, can beextended along the plate toward the tube until they cross.The principal ray must reach the plate at this point. Thisis the foot-point. The relation of patient, tube, base line andplates is very important. I maintain, although this series has been taken with thepatient lying chest to plate, that the upright position is thebest for thorax exposure, because it is easy to assume, the /
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