. Radiography, x-ray therapeutics and radium therapy . PLATE XXXII.—Malignant Diseases of the Chest. a, Secondary deposits of sarcoma iu mediastinum and lungs. h, Lynipho sarcoma of mediastinum, extending outwards from root of lung towards the periphery,c, Secondary deposits of cancer involving mediastinal glands, lung substance, and pleura ; thediaphragmatic surfaces of the right lung and the liver are also involved. EXAMINATION OF THE THORAX 189 cloth, and even the front of the X-ray box must be covered with an opaquecloth, if reliable observations are to be made. These precautions taken, th
. Radiography, x-ray therapeutics and radium therapy . PLATE XXXII.—Malignant Diseases of the Chest. a, Secondary deposits of sarcoma iu mediastinum and lungs. h, Lynipho sarcoma of mediastinum, extending outwards from root of lung towards the periphery,c, Secondary deposits of cancer involving mediastinal glands, lung substance, and pleura ; thediaphragmatic surfaces of the right lung and the liver are also involved. EXAMINATION OF THE THORAX 189 cloth, and even the front of the X-ray box must be covered with an opaquecloth, if reliable observations are to be made. These precautions taken, the operator should allow a few minutes toelapse in the darkened room before the current is allowed to pass throughthe tube, in order that the retina may become sensitive to the fluorescentappearance of the screen when the tube is working:.. Fig. 153.—Upright screening stand, witli automatic stereoscopic movements of tube- and plate-holder controlled from the switch-board. Suitable for taking radiographs of the thorax.(Butt and Co.) The Routine Examination.—This should always be carried out in adefinite order. The tube should be first centred over the heart, with thediaphragm opened to its widest limit. This enables a view of the whole ofthe thorax to be obtained. Then the tube should be carried well down,and the movements of the diaphragm examined for limitations on eitherside, and the presence of dullness at either base looked for. Next the heart and aorta are carefully scrutinised for abnormalities ofsize, shape, or position, or for the presence of pulsation in abnormal situations. 190 EADIOGKAPHY The tube should then be moved over to the right side of the chest, andthe diaphragm of the apparatus closed laterally until a long slit aperture isobtained. This is carefully adjusted over the hilus of the lung for thedet
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