File:A text-book of radiology (1915) (14571025530).jpg

Identifier: textbookofradiol00mort (find matches)
Title: A text-book of radiology
Year: 1915 (1910s)
Authors: Morton, Edward Reginald, 1867-
Subjects: X-rays Cathode rays Ohm's law Fluorescence X-rays Radiography X-Rays Radiography
Publisher: New York : E.B. Treat & Co.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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rs are indisputableand must take for more accurate results, and it is regret-table that these advantages should be sacrificed for themomentary convenience of having one plate to look atinstead of three. It is true that more care, trouble, andmore plates are required to carry the method out success-fully, but these points are of no account to the radio-logist who is interested in his work; it takes no morethan twenty minutes to make a complete examination,including one or perhaps two, extra exposures to cor-roborate suspicious shadows. If development iscommenced by an assistant immediately after the first 188 TEXT-BOOK OF RADIOLOGY. plate is exposed, the whole result can be known beforethe patient has finished dressing. As this method is applicable to almost every part of thebody the technique is described more or less fully. Thepatient lies on his back on a couch like that shown inFig. 71, with the shoulders well raised on pillows andthe knees drawn up and supported. The compressor is
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Fig. 71. Universal X-Ray Couch. moved into position before the knee support is put inplace. A mark is made on the skin over each kidney,found by taking points half way between the xiphoidcartilage and the umbilicus and three fingers breadthfrom the middle line. The compression tube is inclinedabout 30 degrees from the vertical so as to point up underthe costal border and fixed in position with its centre COMPRESSION METHOD. 189 corresponding- with one of these marks. Over the mouthof the compressor is secured a disc of strong calico—thismust be firmly fixed in position. An 8 x 10 plate isplaced with its centre under the corresponding last rib,and an air ball, made of thin but strong rubber, aboutfive inches in diameter, and enclosed in a calico cover toprevent it bursting, is placed between the mouth of thecompressor and the patient. The calico disc on thecompressor is to prevent the air ball working up the tubewhich it would otherwise do. The air ball is a greatimprovement on pads

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