. Radiography, X-ray therapeutics and radium therapy . ,and the tube thenpassed over to theother side. Differ-ences between thetwo apices should be f carefully noted. The current pass-ing through thetube should be regu-lated by the operator,and this is best doneby an adjustablerheostat close to hishand. With a softtube and a smallprimary current, verytine detail in the lungsubstance can bemade out. This ismost important, forit is often by theexamination of this detail that a diagnosis of early tubercular disease mayhave to be determined. Diagrams may be made on the lead glass in front of the f
. Radiography, X-ray therapeutics and radium therapy . ,and the tube thenpassed over to theother side. Differ-ences between thetwo apices should be f carefully noted. The current pass-ing through thetube should be regu-lated by the operator,and this is best doneby an adjustablerheostat close to hishand. With a softtube and a smallprimary current, verytine detail in the lungsubstance can bemade out. This ismost important, forit is often by theexamination of this detail that a diagnosis of early tubercular disease mayhave to be determined. Diagrams may be made on the lead glass in front of the fluorescent screenof any particularly striking departure from the normal, alterations in thediaphragm can be sketched in, and the amplitude of movement on inspirationand expiration noted. A permanent record of the amplitude of respiratorymovements of the diaphragm can be obtained by getting the patient to inhalefully and hold the breath. An exposure is made. Then the patient exhalesforcibly, and holds the breath while another exposure is made. The two. Fig. 154.—Thorax of an adult, showing practically a normal conditionexcept at the rool of right lung where there is a slight increase ofshadow. (Exposure , ,,„ sec.)
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