Abstract
The author evaluated the usefulness of digital radiography in the radiographic diagnosis of laryngeal diseases, utilizing Fuji Computed Radiography (CR) system. Main distinctive features of CR are as follows; photostimulable phosphor is used as the memory material, X-ray energy pattern is converted into digital signals, and then image signals are processed digitally.As the result, three types of image processing of CR, i. e. contrast processing, spatial frequency enhancement, and image subtraction, were clinically useful methods. Especially, one shot dual energy subtraction method is a new technical procedure to extinguish both cervical spine and calcified cartilage shadows in plain antero-posterior laryngeal X-photograph. Although this method belongs to a kind of plain X-photography, the feature of the laryngeal soft structures can be clearly demonstrated without little mortion artifact during examination.Digital radiography has so high spatial resolution and various image processing systems that it is possible to replace this system for some of the conventional screen-film method in X-ray analysis of laryngeal diseases.
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