Abstract
One height and four widths are measured in the lungfield of the roentgenogram taken under certain fixed conditions, and seven indices are calculated from the above measurements. Types are set according to the values thus calculated, and the Types are simply signified by the figures from 1 to 5 or 6. These figures are placed in the order of I, II, III, IV, A, B and C. This is named the ‘formula of the lungfield’ to describe the morphology of the lungfield in a simple manner by formularizing the shape of the lungfield. Further, since the border line of the values in the indices is different in the right and the left lungfield, the right and left lungfields are separately described.
A. Measurements
1) Height of Lungfield : The middle line of the spinal column is taken as the median line. The distance between the projections of the highest points of the right and left apices of the lung and the highest points of the right and left domes of the diaphragma.
2) Width I of the Lungfield : The length of the perpendicular line to the median line passing the middle of the transversal processus of the 3 rd vertebra falling in the lungfield.
3) Width II of the Lungfield : The length of the perpendicular line to the median line passing the middle of the transversal processus of the 6 th vertebra falling in the lungfield.
4) Width III of the Lungfield : The length of the perpendicular line to the median line passing the middle of the transversal processus of the 9 th vertebra falling in the lungfield.
5) Width IV of the Lungfield : The length of the perpendicular line to the median line passing the apex of the heart-liver angle falling in the lungfield.
B. Indices
1) Lungfield Index I = Width I of Lungfield⋅100/Height of Lungfield
2) Lungfield Index II = Width II of Lungfield⋅100/Height of Lungfield
3) Lungfield Index III = Width III of Lungfield⋅100/Height of Lungfield
4) Lungfield Index IV = Width IV of Lungfield⋅100/Height of Lungfield
5) Lungfield Width Index A = Width I of Lungfield⋅100/Width II of Lungfield
6) Lungfield Width Index B = Width I of Lungfield⋅100/Width III of Lungfield
7) Lungfield Width Index C = Width II of Lungfield⋅100/Width III of Lungfield
