File:Radiography, x-ray therapeutics and radium therapy (1915) (14734541796).jpg

Identifier: radiographyxrayt00knoxuoft (find matches)
Title: Radiography, x-ray therapeutics and radium therapy
Year: 1915 (1910s)
Authors: Knox, Robert, 1868-1928
Subjects: Radiography Radiotherapy X-rays
Publisher: London : A. & C. Black
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN

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he latter regionsis the stereoscopic. This is carried out in the same way as in ordinarystereoscopic work. Two plates are necessary, and in most cases it will befound useful to place on the skin of the patient an opaque body which willgive a shadow, and may be used as a landmark for subsequent comparison.By employing cross wires the stereoscopic may be used in conjunction withMackenzie Davidsons method. Stereoscopic plates should be developedtogether in order to secure, if possible, the same density of negative ; simi-larly the condition of the tube and length of exposure should be the samefor each plate. A note should be made of the position of the plate in relationto the body of the patient. This will be found useful when it is necessary to 107 108 EADIOGRAPHY state the exact position of the foreign body in relation to fixed anatomicallandmarks. Good stereoscopic negatives, when viewed in the stereoscope, showperfect pictures, with the correct perspective for the parts shown, though
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r—) Fig. 89.—Wheatstone stereoscope. (Watson.) the exact localisation of a foreign body may be difficult or in some instancesimpossible. A Wheatstone stereoscope should be employed wheneverpossible, as it affords valuable aid by means of its adjustable parts in quicklygetting the correct position of the plates. When this comparatively elaboratestereoscope is not available, a Pirie hand stereoscope will be found useful.Pirie Stereoscope for the Examination of X-Ray Negatives.—The Pirie stereoscope is arranged on entirely different Unes from theinstruments which have been heretofore employed for the examination of stereoscopic X-ray negatives. Instead of using reflectingmirrors, a double reflectingprism is used. For conveni-ence the prism is mounted inone of two metal tubes, whichare bound together by a con-necting piece, the second tubebeing a plain one only, andserving to exclude extraneousobjects from view. Thestereoscope is Ught, the metalpart being constructed of aluminium, a

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