. Radiography and radio-therapeutics . a matter ofextreme difficulty, notably in thethorax, abdomen, pelvis, axilla andregion of the hip. The exact positionmay be worked out both stereo-scopically and by the MackenzieDavidson method, and yet the neces-sity of avoiding anatomical structuresmay render the subsequent removaldifficult. In some cases it may behelpful to take a lateral view of the thorax or sjiine. This may enable usto say at once where the foreign body lies in relation to a bony landmark,but for exact localisation it is necessary to use the cross-thread method. The triang-ulation m
. Radiography and radio-therapeutics . a matter ofextreme difficulty, notably in thethorax, abdomen, pelvis, axilla andregion of the hip. The exact positionmay be worked out both stereo-scopically and by the MackenzieDavidson method, and yet the neces-sity of avoiding anatomical structuresmay render the subsequent removaldifficult. In some cases it may behelpful to take a lateral view of the thorax or sjiine. This may enable usto say at once where the foreign body lies in relation to a bony landmark,but for exact localisation it is necessary to use the cross-thread method. The triang-ulation method of localisation can be used in other waysthan for the determination of the position of a foreign body. The methodmay be employed for ascertaining the position and size of lesions of theintrathoracic or abdominal organs, it can also be used to measure the size ofbony structures within the skull. The radiographer is occasionally asked tomeasure the size and thickness of a particular bone which the surgeon mayrequire to deal Fig. 167.—Diagram of the picture showu iuradiogram (Fig. 168), lateral position, toillustrate tlie method of measurement oflibula, ascertained from stereoscopic plates. 190 RADIOGRAPHY Figs. 1G7 and 168 illustrate its application to a case of ununited fractureof the fibula. The measurements were obtained by taking stereoscopic
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