File:X-ray manual - U.S. Army (1917) (14757306715).jpg

Identifier: xraymanualusarmy00unit (find matches)
Title: X-ray manual : U.S. Army
Year: 1917 (1910s)
Authors: United States. Surgeon-General's Office American Roentgen Ray Society
Subjects: X-rays Fractures Teeth Chest Heart Radiography
Publisher: New York : Middleditch
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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adjustable rider, and moving perpen-dicular to the plane of the three branches, there slidesa rod having millimeter graduations. A winged nutunder the axis of the compass serves to set the branchesin a desired position. Setting the Compass. (a) Place the rod (S) in the median position, set thegraduation of each of the other rods at zero and loosenthe winged screw. (b) Place the transparent paper chart on a smalldrawing board with the point of the rod (S) on thehorizontal projection of the foreign body. Place theends of the other rods on points 1, 2 and 3. (c) Shorten the rods or lengthen them until theystand at the number of mm. found as the difference indistance, from the plate, between each skin marker andthe projectile. (Fig. 7.) The compass is now ready for use. The patient isremoved to the operating table and placed in the posi-tion in which the X-ray examination was made. Thisrequirement is not too rigid. It is only needed thatthe rod points shall coincide with three skin marks
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Fig. 6. Typical chart for use with the Hirtz compass. 1i J ; 1 V Fig. 7. Hirtz compass set ready for application to the patient.153 154 X-RAY MANUAL—U. S. ARMY (Fig. 8). When this condition is fulfilled, the localiz-ing rod (S) is lowered to touch the skin. It now in-dicates the direction in which the foreign body lies andits depth is told by the distance between the lowerborder of the indicator (r) and the upper margin of thecanal in which the localizing rod moves. By means ofan arc almost any desired adjustment of the localizingrod may be obtained without resetting the compass.The method is interesting in that the localizing instru-ment plays no part in the production of the plate but isset entirely from the plate findings. It must be kept in mind that when two exposures aremade on one plate, each exposure should be just onehalf of the actual exposure time. If two full exposuresare made the plate will be too dense for easy reading. Localization by the Stereoscope. This is often mo

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