X-ray examination (chest fluoroscopy, chest radiograph) is indispensable in health checkups. He can check the lesions of heart, both lungs, diaphragm (including mediastinum and diaphragm), especially lung diseases such as tuberculosis, lung tumor and various inflammatory diseases of lung, as well as pleural lesions, size and shape of heart, ratio of heart to chest and width of mediastinum, shadow, elevation and movement of diaphragm, etc.