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    X-Ray Photography / X射線攝影

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    因為X射線能夠穿透幾乎所有材料，並被所有材料吸收，所以X射線照片不是反射光能的影像，而是射線透射照片。就是說，被攝體是處於曝光光源 (X射線)和記錄乳劑之間。光能被集中成束射向需要紀錄的區域，但和依靠普通光線的攝影不同，通過被攝體的成像光線，並不立即聚焦形成清晰的影像。影像是由被攝體及其內部結構對X射線吸收程度不同，而造成的曝光差異。當器官、組織或其他結構和周周物質存 X射線下，具有同樣透明度時，往往需要使用硫酸鋇或各種碘溶液一類吸收X射線的物質，臨時充入或處理這些部位，以便在射線攝影時清晰可見。將局部器官遮蓋以獲取某一器官的清晰影像的技術叫做斷層X射線攝影，使用這種技術曝光時X光機和底片都需移動。用於醫療和牙科的射線照片是在盡可能弱的能量下，用所謂「柔和」的或長波X射線拍攝。底片被夾在螢光屏之間，只用最低的輻射量進行曝光。工業射線照片用的是「強烈」的、短波X射線，甚至使用r射線，它對有生命的被攝物不安全，及不加遮罩的底片。工業射線照片的曝光能量一般比醫用能量要高出數千甚至百萬千伏。從螢光檢查儀的螢幕上用普通攝影的方法，能拍得非直接X射線照片的影像。
    此為轉載資料 - 如有侵權請留言告知，謝謝您！→ 留言板 ←
    9/22/2009 12:34 PM | Blog it | 攝影專有名詞

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