THE EFFECT OF THE POSITION OF A FOCUS AND THE GRADIENT OF AN OBJECT TO A RADIOGRAPH OF THE APEX OF A LUNG

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  • 胸部X線撮影における焦点位置及び被写体角度の肺尖像に与える影響について
  • キョウブ Xセン サツエイ ニ オケル ショウテン イチ オヨビ ヒシャタイ カクド ノ ハイセンゾウ ニ アタエル エイキョウ ニ ツイテ

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The relations of the position of a focus, the distance between a focus and a film, and the gradient of an object to the image of the apex of a lung were studied. First of all, the standard size of chest was set by the authors and on the basis of it, the distance between a clavicle and the apex of a lung and the size of the back involved in that space were calculated and examined. In order to get an ideal image of the apex of a lung extending from the 4th rib to the 5th rib, the better gradient of an object at every chest thickness were deduced from the standard size of chest. Moreover, the above mentioned study was proved to be sufficient clinically ; on the basis of the culculated gradient of an object, the direct radiographes and indirect ones of every 100 patients were taken and the image of the apex of an lung were mostly ideal ones. The following conclusion were obtained from these studies. 1) If the position of the focus is lowered in order to get a wide field of the apex af an lung, it will not lead to practical results : on the contrary, the gradient of a object has more effects, especially in distant radiography. 2) In order to get an ideal image of the apex of an lung, the following conditions are needed. [numerical formula] The position of the focus……at the 6th thoracic vertebrae.

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