Chest is a wide dynamic range object composed colnplex and colorful organs . Therefore , in radiograph of the chest , if is diMcult to describe the lung and mediastinum at the proper density on one sheet of 丘1m . We have divided it into three cases : film density , tube voltage region and the scatter medium , and introduced NEQ (u), detectability , spectral SNR as an overall image quality evaiuation , and studied application for chest radiography . We obtained the results in which the application of the speed compensating screen is superior to that of density compensating 丘lter or Wide latitude film . We realized the situation of directions and energy on scatter X ・ ray by the Monte − Carlo simulation . In addition , the applicatability of a high density grid was proved using chest radiography . 1, は じ め に
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