体检中最常做的检查就是拍胸片。但胸片仅有黑白两色,又能查出什么疾病呢?在X线胸片中分布在两边的黑色,犹如一扇窗户,这就是肺。由于它能让X光透过,所以在胸片上呈现出黑色。在两肺之间夹着一大片白色,这就是心脏。医学上把这一带叫做纵隔,其中有心、大血管、气管、食管、淋巴组织、胸腺、神经、脂肪等。由于它们的密度大,X光无法透过,因此在胸片上呈现出白色。在肺的前后还有一条条白颜色的东西,这就是肋骨,支撑起胸廓。由于骨骼含钙量大,挡住了X线穿过,在胸片上也是一条条白色影像。 The most common check in the physical examination is to take a chest radiograph. However, only black and white chest X-ray, but also identify what disease? In the chest X-ray distribution on both sides of the black, like a window, this is the lungs. Because it allows X-rays to pass through, it appears black on the chest. Between the two lungs is a large white, which is the heart. Medically called the mediastinum, including heart, blood vessels, trachea, esophagus, lymphoid tissue, thymus, nerves, fat and so on. Due to their high density, X-rays can not pass through and therefore appear white on the chest. Before and after the lung there is a white color of things, this is the ribs, supporting the thorax. As the skeleton of calcium, blocking the X-ray through the chest is a white image.