. Radiography and radio-therapeutics . ent,and the tube thenpassed over to theother side. Differ-ences between thetwo apices should becarefully noted. The current pass-ing through the tubeshould be regulatedby the operator, andthis is best done byan adjustable rheo-stat close to his a soft tube anda small primarycurrent, very finedetail in the lung sub-stance can be madeout. This is mostimportant, for it isoften by the examin-ation of this detail that a diagnosis of early tubercular disease may haveto be determined. Diagrams may be made on the lead glass in front of the fluorescent s
. Radiography and radio-therapeutics . ent,and the tube thenpassed over to theother side. Differ-ences between thetwo apices should becarefully noted. The current pass-ing through the tubeshould be regulatedby the operator, andthis is best done byan adjustable rheo-stat close to his a soft tube anda small primarycurrent, very finedetail in the lung sub-stance can be madeout. This is mostimportant, for it isoften by the examin-ation of this detail that a diagnosis of early tubercular disease may haveto 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 toinhale fully and hold the breath. An exposure is made. Then the patientexhales forcibly, and holds the breath while another exposure is made. The. Fig. 246.—Thorax of an adult, showing practically a normal couditionexcept at the root of the right lung where there is a slight increaseof shadow. (Exposure yj^ sec.) EXAMINATION OF THE THORAX 283 two shadows on one plate show the degree of diaphragmatic excursion. Allobservations of this kind should be immediately transferred to paper oncompletion of the examination, and entered in the notes of the case. These observations are of the greatest value in all cases ; but if they areto be useful a note must be made at once, otherwise the personal elementwill enter largely into the case. Even under the most favourable conditionsthis factor must be considered, since it is the great objection to all screenexaminations. In no other region of the body are we so absolutely dependentupon screen examination of a patient. The trained eye of the observer maydetect changes in movement in lungs or heart which it is impossible to recordupon a plate. But radiog
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